Question 1: Palette 1/202

Errorless NEET 2024 MCQ

In an ecosystem if the Net Primary productivity (NPP) of first trophic level is $100x(kcal\ m^{-2})yr^{-1}$ , what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem

A

$\frac{x}{10}(kcal\ m^{-2})yr^{-1}$

B

$x(kcal m^{-2})yr^{-1}$

C

$10x(kcal m^{-2})yr^{-1}$

D

$\frac{100x}{3x} (kcal m^{-2})yr^{-1}$

Question 2: Palette 2/202

Errorless NEET 2023 MCQ

Identify the correct statements:
(A) Detrivores perform fragmentation.
(B) The humus is further degraded by some microbes during mineralization.
(C) Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.
(D) The detritus food chain begins with living organisms.
(E) Earthworms break down detritus into smaller particles by a process called catabolism.

A

B, C, D only

B

C, D, E only

C

D, E, A only

D

A, B, C only

Question 3: Palette 3/202

Errorless NEET 2023 MCQ

Given below are two statements Statement I : Gause's ‘Competitive Exclusion Principle’ states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually. Statement II : In general, carnivores are more adversely affected by competition than herbivores. In the light of the above statements, choose the correct answer from the options given below

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 4: Palette 4/202

Errorless NEET 2023 MCQ

Which of the following statements is correct

A

Biomagnification refers to increase in concentration of the toxicant at successive trophic levels

B

Presence of large amount of nutrients in water restricts 'Algal Bloom'

C

Algal Bloom decreases fish mortality

D

Eutrophication refers to increase in domestic sewage and waste water in lakes

Question 5: Palette 5/202

Errorless NEET 2022 MCQ

Given below are two statements Statement I : Decomposition is a process in which the detritus is degraded into simpler substances by microbes Statement II : Decomposition is faster if the detritus is rich in lignin and chitin In the light of the above statements, choose the correct answer from the options given below

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 6: Palette 6/202

Errorless NEET 2022 MCQ

Detritivores breakdown detritus into smaller particles. This process is called

A

Humification

B

Decomposition

C

Catabolism

D

Fragmentation

Question 7: Palette 7/202

Errorless NEET 2021 MCQ

Which of the following statements is not correct

A

Pyramid of biomass in sea is generally upright

B

Pyramid of energy is always upright

C

Pyramid of numbers in a grassland ecosystem is upright

D

Pyramid of biomass in sea is generally inverted

Question 8: Palette 8/202

Errorless NEET 2021,23 MCQ

In the equation GPP - R = NPP GPP is Gross Primary Productivity NPP is Net Primary Productivity R here is ____

A

Respiratory quotient

B

Respiratory loss

C

Reproductive allocation

D

Photosynthetically active radiation

Question 9: Palette 9/202

Errorless NEET 2020 MCQ

Match the trophic levels with their correct species examples in grassland ecosystem

Column-I	Column-II
(A) Four trophic level (B) Second trophic level (C) First trophic level (D) Third trophic level	(P) Crow (Q) Vulture (R) Rabbit (S) Grass

A

A–P, B–Q, C–R, D–S

B

A–Q, B–R, C–S, D–P

C

A–R, B–Q, C–S, D–P

D

A–S, B–R, C–Q, D–P

Question 10: Palette 10/202

Errorless NEET 2020 MCQ

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct

A

There is no relationship between Gross primary productivity and Net primary productivity

B

Gross primary productivity is always less than net primary productivity

C

Gross primary productivity is always more than net primary productivity

D

Gross primary productivity and Net primary productivity are one and same

Question 11: Palette 11/202

Errorless NEET 2019 MCQ

Which of the following ecological pyramids is generally inverted

A

Pyramid of numbers in grassland

B

Pyramid of energy

C

Pyramid of biomass in a forest

D

Pyramid of biomass in a sea

Question 12: Palette 12/202

Errorless NEET 2019 MCQ

Which of the statements given below is not true about formation of Annual Rings in trees

A

Annual ring is a combination of spring wood and autumn wood produced in a year

B

Differential activity of cambium causes light and dark bands of tissue – early and late wood respectively

C

Activity of cambium depends upon variation in climate

D

Annual rings are not prominent in trees of temperate region

Question 13: Palette 13/202

Errorless NEET 2018 MCQ

Which of the following organisms are known as chief producers in the oceans

A

Dinoflagellates

B

Diatoms

C

Cyanobacteria

D

Euglenoids

Question 14: Palette 14/202

Errorless NEET 2018 MCQ

What type of ecological pyramid would obtained with the following data Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g

A

Inverted pyramid of biomass

B

Pyramid of energy

C

Upright pyramid of numbers

D

Upright pyramid of biomass

Question 15: Palette 15/202

Errorless NEET 2017 MCQ

Which ecosystem has the maximum biomass

A

Forest ecosystem

B

Grassland ecosystem

C

Pond ecosystem

D

Lake ecosystem

Question 16: Palette 16/202

Errorless WB-JEE 2016 MCQ

'Edge effect' is observed in case of

A

Ecozone

B

Ecotone

C

Biotope

D

Ecosphere

Question 17: Palette 17/202

Errorless NEET (Phase-II) 2016 MCQ

The primary producers of the deep-sea hydrothermal vent ecosystem are

A

Coral reefs

B

Green algae

C

Chemosynthetic bacteria

D

Blue-green-algae

Question 18: Palette 18/202

Errorless NEET (Phase-II) 2016 MCQ

Which of the following is correct for r-selected species

A

Small number of progeny with large size

B

Large number of progeny with small size

C

Large number of progeny with large size

D

Small number of progeny with small size

Question 19: Palette 19/202

Errorless MHCET 2015 MCQ

Earthworm is a

A

Herbivore

B

Secondary consumer

C

Tertiary consumer

D

Detrivore

Question 20: Palette 20/202

Errorless AIPMT 2015 MCQ

Most animals that live in deep oceanic waters are

A

Secondary consumers

B

Tertiary consumers

C

Detritivores

D

Primary consumers

Question 21: Palette 21/202

Errorless CBSE PMT 2014; KCET 2015 MCQ

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain Plant → Mice → Snake → Peacock

A

0.2 J

B

0.0002 J

C

0.02 J

D

0.002 J

Question 22: Palette 22/202

Errorless NEET (Karnataka) 2013 MCQ

Benthic organism are affected most by

A

Light reaching the forest floor

B

Surface turbulence of water

C

Sediment characteristics of aquatic ecosystems

D

Water-holding capacity of soil

Question 23: Palette 23/202

Errorless NEET (Karnataka) 2013 MCQ

Which one of the following is a primary consumer in maize field ecosystem

A

Grasshopper

B

Wolf

C

Phytoplankton

D

Lion

Question 24: Palette 24/202

Errorless NEET (Karnataka) 2013 MCQ

When man eats fish which feeds on zooplankton which have eaten small plants, the producer in the chain is

A

Small plants

B

Fish

C

Man

D

Zooplankton

Question 25: Palette 25/202

Errorless J & K CET 2012 MCQ

The detritus food chain begins with

A

Primary producers

B

Primary consumers

C

Secondary consumers

D

Dead organic matter

Question 26: Palette 26/202

Errorless MP PMT 2012 MCQ

The pyramid of numbers of a parasitic food chain in a forest ecosystem is

A

Always inverted

B

Always upright

C

Mixture of inverted and upright

D

Sometimes inverted and sometime upright

Question 27: Palette 27/202

Errorless Kerala PMT 2012 MCQ

In a particular climatic condition, decomposition rate is slower if

A

Detritus is rich in nitrogen

B

Detritus is rich in humus

C

Detritus is rich in sugars

D

Detritus is rich in lignin and chitin

E

Detritus is rich in water soluble substances

Question 28: Palette 28/202

Errorless Kerala PMT 2012 MCQ

An inverted pyramid of number and an inverted pyramid of biomass are respectively seen in

A

Grassland and tree ecosystem

B

Sea and tree ecosystem

C

Tree and sea ecosystem

D

Sea and grassland ecosystem

E

Tree and grassland ecosystem

Question 29: Palette 29/202

Errorless AMU (Med.) 2012 MCQ

In a pyramid of biomass, if the total dry weight $(kg / m^2)$ of primary producers is about 809 it will decrease at tertiary consumer level upto

A

$37\mathrm{kg} / \mathrm{m}^2$

B

$11\mathrm{kg} / \mathrm{m}^2$

C

$5\mathrm{kg} / \mathrm{m}^2$

D

$1.5\mathrm{kg} / \mathrm{m}^2$

Question 30: Palette 30/202

Errorless J & K CET 2012 MCQ

Which of the following has the largest population in a food chain

A

Producers

B

Primary consumers

C

Secondary consumers

D

Decomposers

Question 31: Palette 31/202

Errorless BHU 2012; KCET 2018 MCQ

Which of the following relations is correct regarding GPP and NPP of an ecosystem

A

NPP=GPP - Animal consumption

B

NPP=GPP + Plant respiration

C

NPP=GPP - Plant respiration

D

NPP=GPP + Animal consumption

Question 32: Palette 32/202

Errorless CBSE PMT (Pre.) 2012 MCQ

The upright pyramid of number is absent in

A

Pond

B

Forest

C

Lake

D

Grassland

Question 33: Palette 33/202

Errorless CBSE PMT (Pre.) 2012; KCET 2018 MCQ

Which one of the following is not a functional unit of an ecosystem

A

Energy flow

B

Decomposition

C

Productivity

D

Stratification/Pollution

Question 34: Palette 34/202

Errorless NCERT; CBSE PMT (Pre.) 2012 MCQ

Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels

A

Level PC is “insects” and level SC is “small insectivorous birds”

B

Level PP is “phytoplanktons” in sea and “Whale” on top level TC

C

Level one PP is “pipal trees” and the level SC is “sheep”

D

Level PC is "rats" and level SC is "cats"

Question 35: Palette 35/202

Errorless CBSE PMT (Pre.) 2012 MCQ

Identify the possible link “A” in the following food chain: Plant → insect – frog → “A” → Eagle

A

Rabbit

B

Wolf

C

Cobra

D

Parrot

Question 36: Palette 36/202

Errorless BHU 2012 MCQ

Which of the following cannot be recycled in an ecosystem

A

Nitrogen

B

Oxygen

C

Energy

D

Water

Question 37: Palette 37/202

Errorless AMU (Med.) 2012 MCQ

The important steps in the process of decomposition are

A

Fragmentation and mineralization

B

Leaching and catabolism

C

Humification and mineralization

D

All of these

Question 38: Palette 38/202

Errorless CBSE PMT (Pre.) 2011 MCQ

Which one of the following statement for pyramid of energy is incorrect, whereas the remaining three are correct

A

It is upright in shape

B

Its base is broad

C

It shows energy content of different trophic level organisms

D

It is inverted in shape

Question 39: Palette 39/202

Errorless CBSE PMT (Pre.) 2011 MCQ

Of the total incident solar radiation the proportion of PAR is [NCERT Pg. No. 209]

A

More than 80%

B

About 70%

C

About 60%

D

Less then 50%

Question 40: Palette 40/202

Errorless Kerala PMT 2011 MCQ

Which of the following statements regarding food chain is false

A

In an aquatic ecosystem, grazing food chain is the major conduct for energy flow

B

In terrestrial ecosystems, a large fraction of energy flows through detritus food chain

C

The detritus food chain begins with dead organic matter

D

Primary consumers belong to the first trophic level

E

Animals like cockroaches and crows are omnivores

Question 41: Palette 41/202

Errorless Kerala PMT 2011 MCQ

In a grazing food chain carnivores may also be referred to as

A

Primary producers

B

Secondary producers

C

Primary consumers

D

Secondary consumers

E

Decomposers

Question 42: Palette 42/202

Errorless CBSE PMT (Mains) 2011 MCQ

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time

A

Goat

B

Frog

C

Sparrow

D

Lion

Question 43: Palette 43/202

Errorless Kerala PMT 2010 MCQ

Which of the following statement regarding decomposition is false

A

Warm and moist environment favours decomposition

B

Decomposition rate is slower if detritus is rich in chitin and lignin

C

Earthworm is a detritivore

D

Precipitation of soluble inorganic nutrients into the soil horizon as unavailable salt is called mineralisation

E

Detritus is the raw material for decomposition

Question 44: Palette 44/202

Errorless Kerala PMT 2010 MCQ

Which of the following is false

A

Quantity of biomass in a trophic level at a particular period is called as standing crop

B

The energy content in a trophic level is determined by considering a few individuals of a species in that trophic level

C

The succession that occurs in newly cooled lava is called primary succession

D

Rate of succession is faster in secondary succession

E

Phytoplanktons are the pioneers in the aquatic ecosystem

Question 45: Palette 45/202

Errorless CBSE PMT (Mains) 2010 MCQ

Identify the likely organisms (1), (2), (3) and (4) in the food web shown below

A

1-Deer, 2-Rabbit, 3-Frog, 4-Rat

B

1-Dog, 2-Squirrel, 3-Bat, 4-Deer

C

1-Rat, 2-Dog, 3-Tortoise, 4-Crow

D

1-Squirrel, 2-Cat, 3-Rat, 4-Pigeon

Question 46: Palette 46/202

Errorless CBSE PMT (Mains) 2010 MCQ

Which of the following representations shows the pyramid of numbers in a forest ecosystem
(A)

(B)

(C)

(D)

A

D

B

A

C

B

D

C

Question 47: Palette 47/202

Errorless CBSE PMT (Pre.) 2010 MCQ

Study the four statements $(A-D)$ given below and select the two correct ones out of them
(A) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers
(B) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates
(C) Predators ultimately lead to the extinction of prey species
(D) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders

A

A and B

B

B and C

C

C and D

D

A and D

Question 48: Palette 48/202

Errorless CBSE PMT (Pre.) 2010; Kerala PMT 2012 MCQ

The biomass available for consumption by the herbivores and the decomposers is called

A

Gross primary productivity

B

Net primary productivity

C

Secondary productivity

D

Standing crop

Question 49: Palette 49/202

Errorless AIIMS 2010 MCQ

In a stable ecosystem, which of the following limits the number of trophic levels

A

Biomass

B

The number of nutrients

C

Availability of nutrients

D

Presence of contaminants that increase in concentration along the food chain

Question 50: Palette 50/202

Errorless AIIMS 2010 MCQ

Assertion : The rate of decomposition of detritus is reduced in the regions of high altitude. Reason : It happens due to immobilisation of nutrients

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 51: Palette 51/202

Errorless Odisha JEE 2009 MCQ

Which most often limits the primary productivity of the ecosystem

A

Solar radiation/light

B

Oxygen

C

Consumers

D

Nitrogen

Question 52: Palette 52/202

Errorless CBSE PMT 2009 MCQ

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem

A

Phytoplankton

B

Fish

C

Zooplankton

D

Frog

Question 53: Palette 53/202

Errorless DUMET 2009 MCQ

In an aquatic ecosystem, the trophic level equivalent to cows in grassland is

A

Phytopankton

B

Zooplankton

C

Nekton

D

Benthos

Question 54: Palette 54/202

Errorless Kerala PMT 2009 MCQ

Select the formula for ecological efficiency

A

$\frac{\text{Gross primary productivity} \times 100}{\text{Incident total solar radiation}}$

B

$\frac{\text{Food energy digested} \times 100}{\text{Food energy ingested}}$

C

$\frac{\text{Net primary productivity} \times 100}{\text{Gross primary productivity}}$

D

$\frac{\text{Energy in biomass production at a trophic level} \times 100}{\text{Energy in biomass production at previous trophic level}}$

E

$\frac{\text{Volume of } CO_2 \text{ evolved}}{\text{Volume of } O_2 \text{ consumed}}$

Question 55: Palette 55/202

Errorless WB JEE 2009 MCQ

Identify the correct type of food chain dead animal → blow fly maggots → common frog → snake

A

Grazing food chain

B

Detrital food chain

C

Decomposer food chain

D

Predator food chain

Question 56: Palette 56/202

Errorless WB JEE 2009 MCQ

Which of the following is an example of man-made ecosystem

A

Herbarium

B

Aquarium

C

Tissue culture

D

Forest

Question 57: Palette 57/202

Errorless AMU (Med.) 2009 MCQ

A progressive series of changes in plant and animal life of an area from initial colonization is known as

A

Evolution

B

Succession

C

Specialisation

D

Selection

Question 58: Palette 58/202

Errorless Odisha JEE 2008 MCQ

Which type of pyramid of energy is inverted

A

Grass land

B

Tree

C

Both of these

D

None of these

Question 59: Palette 59/202

Errorless AFMC 2008, 09; Odisha JEE 2012 MCQ

Pyramid of energy in a pond ecosystem is always [NCERT Pg. No. 213]

A

Inverted

B

Upright

C

Irregular

D

Linear

Question 60: Palette 60/202

Errorless CBSE PMT 2008 MCQ

Consider the following statements concerning food chains
(A) Removal of 80% tigers from a area resulted in greatly increased growth of vegetation
(B) Removal of most of the carnivores resulted in an increased population of deers
(C) The length of food chains is generally limited to 3-4 trophic levels due to energy loss
(D) The length of food chains may vary from 2 to 8 trophic levels

A

A, D

B

A, B

C

B, C

D

C, B

Question 61: Palette 61/202

Errorless WB JEE 2008 MCQ

Identify which one of the following is an e.g. of incomplete ecosystem Or Which of the following habitats is most unsuitable for primary productivity [MP PMT 1999]

A

Grassland

B

Cave

C

River

D

Wetland

Question 62: Palette 62/202

Errorless Odisha JEE 2008 MCQ

Which atom is limiting the primary productivity mostly

A

C

B

P

C

D

D

N

Question 63: Palette 63/202

Errorless Odisha JEE 2008 MCQ

Which of the following ecosystem has very little primary productivity

A

Forest

B

River

C

Sea

D

Grass Land

Question 64: Palette 64/202

Errorless Odisha JEE 2008 MCQ

An organism contains carbon molecules which have passed through three levels of ecosystem. The organism is a

A

Primary consumer

B

Tertiary consumer

C

Predator

D

Producer

Question 65: Palette 65/202

Errorless AIIMS 2008 MCQ

Assertion : A network of food chains existing together in an ecosystem is known as a food web. Reason : An animal like kite cannot be a part of a food web.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 66: Palette 66/202

Errorless Kerala PMT 2007 MCQ

In a pyramid of numbers, in a grassland ecosystem, the largest population is that of

A

Producers

B

Tertiary consumers

C

Secondary consumers

D

Primary consumers

E

Herbivores

Question 67: Palette 67/202

Errorless Kerala PMT 2007 MCQ

Which one of the following regarding ecological pyramid is not correct

A

In most ecosystems, the pyramid of numbers and biomass are upright

B

In tree-dominated ecosystem the pyramid of numbers is inverted

C

The pyramid of energy expresses mainly the rate of food production

D

In deep water ecosystem, the pyramid of biomass is upright

E

The total energy flow at successive trophic level always decreases

Question 68: Palette 68/202

Errorless MP PMT 2007 MCQ

Phytoplanktons are

A

Heterotrophs

B

Autotrophs

C

Saprotrophs

D

All of these

Question 69: Palette 69/202

Errorless MP PMT 2007; Odisha JEE 2010 MCQ

Psammophytes are plants that grow where soil is

A

Alkaline

B

Sandy

C

Acidic

D

Alluvial

Question 70: Palette 70/202

Errorless AFMC 2006 MCQ

Food chain is a series of population which starts with producers. Its is concerned with

A

Biotic components only

B

Energy flow and transfer of nutrients

C

Both

D

Biotic and decomposers

Question 71: Palette 71/202

Errorless DPMT 2006 MCQ

Which is an example of true pyramid in an ecosystem Or The number of individuals at the trophic level decreases from the producer level to the consumer level in [J & K CET 2010]

A

Pyramid of a biomass

B

Pyramid of number

C

Pyramid of energy

D

None of the above

Question 72: Palette 72/202

Errorless CBSE PMT 2006 MCQ

Which of the following is not used for construction of ecological pyramids

A

Rate of energy flow

B

Fresh weight

C

Dry weight

D

Number of individuals

Question 73: Palette 73/202

Errorless AIIMS 2005 MCQ

Given below is one of the types of ecological pyramids This type represents

A

Pyramid of numbers in a grassland

B

Pyramid of biomass in a fallow land

C

Pyramid of biomass in a lake

D

Energy pyramid in a spring

Question 74: Palette 74/202

Errorless RPMT 2005 MCQ

A place was rocky and barren but now there is a green forest; the sequence of origin is

A

Lichen, moss, herbs, shrubs

B

Moss, lichen, herbs, shrubs

C

Lichen, moss, shrubs, herbs

D

Shrubs, herbs, moss, lichen

Question 75: Palette 75/202

Errorless Kerala PMT 2004 MCQ

Energy flow and energy transformations in living systems strictly conform to the Or Flow of energy declines from low to higher trophic level in ecosystem, is mainly explained by [MP PMT 1999]

A

Law of limiting factors

B

Liebig's law of minimum

C

Laws of thermodynamics (second)

D

Shelford's law of tolerance

E

Biogenetic law

Question 76: Palette 76/202

Errorless CBSE PMT 2004 MCQ

An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having

A

Low stability and low resilience

B

High stability and high resilience

C

Low stability and high resilience

D

High stability and low resilience

Question 77: Palette 77/202

Errorless KCET 2004 MCQ

These belong to the catery of primary consumers ....

A

Snakes and frogs

B

Water insects

C

Eagle and snakes

D

Insects and cattle

Question 78: Palette 78/202

Errorless BHU 2004 MCQ

A man-made ecosystem is

A

Less in diversity

B

More in diversity

C

Man does not make ecosystem

D

More stable than natural ecosystem

Question 79: Palette 79/202

Errorless BHU 2004 MCQ

Which of the following supports a dense population of plankton and littoral vegetation

A

Oligotrophic

B

Eutrophic

C

Lithotrophic

D

Agroecotrophic

Question 80: Palette 80/202

Errorless MP PMT 2004 MCQ

Which of the food chains directly depends on solar radiations

A

Predator

B

Grazing

C

Detritus

D

None of these

Question 81: Palette 81/202

Errorless AIIMS 2004, 08 MCQ

The Great Barrier Reef along the east coast of Australia can be categorised as

A

Population

B

Community

C

Ecosystem

D

Biome

Question 82: Palette 82/202

Errorless AIEEE Pharmacy 2004; J & K CET 2008; Odisha JEE 2011; BHU 2012 MCQ

The flow of energy among various trophic levels of an ecosystem is

A

Unidirectional

B

Bidirectional

C

Multidirectional

D

Circular

Question 83: Palette 83/202

Errorless CPMT 2003; Kerala PMT 2004; BHU 2004; AIIMS 2010 MCQ

Bacteria and fungi in a forest ecosystem are generally Or Micro-organism are [J & K CET 2008] Or The bacteria that attack dead organic matter are [ [MH CET 2001]

A

Producers

B

Decomposers

C

Primary consumers

D

Secondary consumers

E

Tertiary consumers

Question 84: Palette 84/202

Errorless MHCET 2003; Manipal 2005 MCQ

Inverted pyramid is found in

A

Biomass pyramid of aquatic system

B

Energy pyramid of grassland

C

Biomass pyramid of grassland

D

Pyramid of number of aquatic system

Question 85: Palette 85/202

Errorless AIEEE Pharmacy 2003 MCQ

The maximum biomass of living diatoms is to be found in

A

Marine pelagic habitats

B

Moist soil and swamps

C

Deep coastmines

D

Salt lakes

Question 86: Palette 86/202

Errorless DPMT 2003 MCQ

When spontaneous process occurs then free energy of system

A

Decrease

B

Increase

C

Remains same

D

Either can increase or decrease

Question 87: Palette 87/202

Errorless AIEEE Pharmacy 2003 MCQ

Which ecosystem shows maximum genetic diversity

A

Coniferous forests

B

Tropical rain forests

C

Subtropical forests

D

Temperate forests

Question 88: Palette 88/202

Errorless AIIMS 2003 MCQ

Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying

A

First trophic level

B

Second trophic level

C

Third trophic level

D

Fourth trophic level

Question 89: Palette 89/202

Errorless AIIMS 2003 MCQ

Assertion : In a food chain members of successive higher levels are fewer in number. Reason : Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

E

If assertion is false but reason is true.

Question 90: Palette 90/202

Errorless CBSE PMT 2002 MCQ

If bamboo plant is growing in a far forest then what will be its trophic level

A

First

B

Second

C

Third

D

Fourth

Question 91: Palette 91/202

Errorless BVP 2002; MP PMT 2004 MCQ

A food chain starts with

A

Nitrogen fixing organisms

B

Photosynthesis

C

Respiration

D

Decomposers

Question 92: Palette 92/202

Errorless CBSE PMT 2002 MCQ

Which of the following food chain may not be directly dependent upon solar energy

A

Grazing

B

Detritus

C

Soaking

D

Depleting

Question 93: Palette 93/202

Errorless BHU 2002 MCQ

In a food web, each successive trophic level has

A

Increased total energy

B

Less total energy content

C

More total energy content

D

Non estimated energy content

Question 94: Palette 94/202

Errorless MP PMT 2002 MCQ

In food chain initial organisms are

A

Top consumers

B

Secondary consumers

C

Primary consumers

D

Photosynthates
Or

Question 95: Palette 95/202

Errorless RPMT 2002; MHCET 2003 MCQ

A pond is a

A

Biome

B

Natural ecosystem

C

Artificial ecosystem

D

Community of plants and animals

Question 96: Palette 96/202

Errorless NCERT; CPMT 2002; RPMT 2005 MCQ

When peacock eats snakes which eat insects thriving on green plants, the peacock is

A

A primary consumer

B

A primary decomposer

C

Final decomposer

D

The apex of food pyramid

Question 97: Palette 97/202

Errorless CBSE PMT 2002 MCQ

A plant being eaten by a herbivorous which in turn is eaten by a carnivorous makes Or The transfer of energy from organism to organism in a natural community establishes [MP PMT 1999]

A

Food chain

B

Food web

C

Omnivorous

D

Interdependent

Question 98: Palette 98/202

Errorless MP PMT 2002; Odisha JEE 2005 MCQ

Ecosystem is

A

Open

B

Closed

C

Both open and close

D

Neither open nor closed

Question 99: Palette 99/202

Errorless CBSE PMT 2001; CPMT 2003; Odisha JEE 2009 MCQ

Energy and nutrients enter a community by

A

Primary consumer

B

Producer

C

Decomposer

D

Sunlight

Question 100: Palette 100/202

Errorless MHCET 2001 MCQ

Which of the following is most important abiotic factor in pond ecosystem

A

Water

B

Phytoplankton

C

Zooplankton

D

Temperature

Question 101: Palette 101/202

Errorless MP PMT 2001; BHU 2001 MCQ

Which are the biotic components of forest ecosystem

A

Producers

B

Decomposers

C

Consumers

D

All of the above

Question 102: Palette 102/202

Errorless MP PMT 2001 MCQ

Which of the following is an artificial ecosystem

A

Rice-field

B

Forest

C

Grassland

D

Lake

Question 103: Palette 103/202

Errorless CBSE PMT 2001; MHCET 2003 MCQ

When the number of organisms at successive levels are plotted, they assume the shape of a pyramid. This is called the pyramid of

A

Energy

B

Number

C

Biomass

D

Both

Question 104: Palette 104/202

Errorless BHU 2001; Pb. PMT 2004 MCQ

In a food chain, the total amount of living material is depicted by

A

Pyramid of biomass

B

Pyramid of energy

C

Pyramid of number

D

Trophic levels

Question 105: Palette 105/202

Errorless MP PMT 2001, 02; BHU 2001 MCQ

Generally the food chain has how many trophic levels

A

One

B

Two

C

Three or Four

D

Three

Question 106: Palette 106/202

Errorless MHCET 2001; BVP 2001; Odisha JEE 2011 MCQ

In a food chain herbivores are [NCERT Pg. No. 209]

A

Primary producers

B

Primary consumers

C

Secondary consumers

D

Decomposers

Question 107: Palette 107/202

Errorless AIIMS 2001; BVP 2001 MCQ

The ecosystem consists of

A

Producers

B

Consumers

C

Decomposers

D

All of these

Question 108: Palette 108/202

Errorless MP PMT 2001; AFMC 2006; CBSE PMT (Mains) 2012; NEET 2013 MCQ

The rate of formation of new organic matter by rabbit in a grassland, is called

A

Net productivity

B

Secondary productivity

C

Net primary productivity

D

Gross primary productivity

Question 109: Palette 109/202

Errorless CPMT 2001; Kerala PMT 2004; HP PMT 2005; Kerala CET 2005; J & K CET 2010; MP PMT 2010; Odisha JEE 2010; WB JEE 2016 MCQ

Transition zone between two ecosystems or vegetational regions is termed Or Overlapping region between two ecosystems [DPMT 2006; WB JEE 2011]

A

Ecocline

B

Ecotone

C

Ecad

D

Barrier

Question 110: Palette 110/202

Errorless MHCET 2001; Pb. PMT 2004; RPMT 2006 MCQ

During food chain the maximum energy is stored in

A

Producers

B

Decomposers

C

Herbivores

D

Carnivores

Question 111: Palette 111/202

Errorless KCET 2000 MCQ

The lentic ecosystem includes which of following water

A

Rain

B

Running

C

Standing

D

Gravitational

Question 112: Palette 112/202

Errorless BVP 2000; RPMT 2005; AFMC 2010; AMU (Med.) 2010 MCQ

Pyramid of energy is

A

Upright

B

Inverted

C

Oblique

D

None of these

Question 113: Palette 113/202

Errorless CPMT 2000 MCQ

On the global basis the maximum productivity is shown by

A

Aquatic ecosystem

B

Grasslands

C

Forests

D

Deserts

Question 114: Palette 114/202

Errorless AIIMS 2000 MCQ

The flora and fauna in lakes or ponds are

A

Lentic biota

B

Lotic biota

C

Abiotic biota

D

Field layer

Question 115: Palette 115/202

Errorless CPMT 2000; WB JEE 2009 MCQ

Trophic levels are formed by

A

Organisms linked in food chain

B

Only plants

C

Only animals

D

Only carnivores

Question 116: Palette 116/202

Errorless BVP 2000 MCQ

Animals which live at the bottom of sea are

A

Nekton

B

Diatom

C

Benthos

D

Plankton

Question 117: Palette 117/202

Errorless MP PMT 2000, 03 MCQ

Food chain consists of

A

Producer, consumer and decomposer

B

Producer, carnivore and decomposer

C

Producer and primary consumer

D

Producer, herbivore and carnivore

Question 118: Palette 118/202

Errorless CPMT 2000 MCQ

The ecosystem of a pond is referred as

A

Lotic

B

Lentic

C

Xeric

D

Benthic

Question 119: Palette 119/202

Errorless MP PMT 1999; CBSE PMT 2001 MCQ

Tip of ecological pyramid is occupied by

A

Herbivores

B

Carnivores

C

Producers

D

Decomposers

Question 120: Palette 120/202

Errorless MP PMT 1999 MCQ

Green plants constitute

A

First trophic level

B

Second trophic level

C

Third trophic level

D

Complete food chain

Question 121: Palette 121/202

Errorless Pb. PMT 1999; RPMT 1999 MCQ

Cyberviatic is associated with

A

Flow of energy

B

Cycle of energy

C

Energy released

D

Study of energy

Question 122: Palette 122/202

Errorless NCERT; AFMC 1999; Pb. PMT 2004; HP PMT 2005 MCQ

Which is the correct sequence in the food chain in a grassland

A

Grass $\rightarrow$ wolf $\rightarrow$ deer $\rightarrow$ buffalo

B

Bacteria $\rightarrow$ grass $\rightarrow$ rabbit $\rightarrow$ wolf

C

Grass $\rightarrow$ insect $\rightarrow$ birds $\rightarrow$ snakes

D

Grass $\rightarrow$ snake $\rightarrow$ insect $\rightarrow$ deer

Question 123: Palette 123/202

Errorless KCET 1999 MCQ

A rat feeding upon potato tuber is

A

Producer

B

Carnivore

C

Decomposer

D

Primary consumer

Question 124: Palette 124/202

Errorless CPMT 1999, 2001, 02, 10; KCET 2000; MP PMT 2001, 02; HP PMT 2005; Odisha JEE 2005; WB JEE 2011 MCQ

The pyramid that cannot be inverted in a stable ecosystem, is pyramid of

A

Number

B

Energy

C

Biomass

D

All the above

Question 125: Palette 125/202

Errorless BHU 1999 MCQ

The dominant second trophic level, in a lake ecosystem, is

A

Benthos

B

Plankton

C

Zooplankton

D

Phytoplankton

Question 126: Palette 126/202

Errorless CBSE PMT 1999; BHU 2005, 08; DUMET 2010; AMU (Med.) 2010 MCQ

What energy percentage can be captured by the organisms of next trophic level Or Transfer of energy from one trophic level to other trophic level is according to the second law of thermodynamics. The efficiency of energy transfer from herbivorous to carnivorous is [CBSE PMT 1996; AIEEE Pharmacy 2004]

A

$20\%$

B

$30\%$

C

$90\%$

D

$10\%$

Question 127: Palette 127/202

Errorless AIIMS 1999 MCQ

The food chain in which microbes split energy rich compounds of the producer community is

A

Parasitic food chain

B

Detritus food chain

C

Predators food chain

D

Producer food chain

Question 128: Palette 128/202

Errorless MP PMT 1999, 2006 MCQ

Ecosystem may be defined as

A

Group of plants which act as the energy suppliers

B

Group of organisms which form population

C

Functional unit for ecological studies

D

None of these

Question 129: Palette 129/202

Errorless MP PMT 1999 MCQ

In an ecosystem in abiotic components which of the following occur

A

Flow of energy

B

Cycling of materials

C

Consumers

D

Flow of energy and cycling of materials

Question 130: Palette 130/202

Errorless MP PMT 1999 MCQ

The snakes are included under

A

Saprophytes

B

Primary consumers

C

Second trophic level

D

None of these

Question 131: Palette 131/202

Errorless MP PMT 1999 MCQ

The zooplanktonic forms are

A

Primary consumers

B

Secondary consumers

C

Carnivores

D

Primary producers

Question 132: Palette 132/202

Errorless CBSE PMT 1999 MCQ

The maximum biomagnification would be in which of the following in case of aquatic ecosystem

A

Fishes

B

Birds

C

Zooplanktons

D

Phytoplanktons

Question 133: Palette 133/202

Errorless Pb. PMT 1999; RPMT 1999 MCQ

Biomass pyramid of forest is

A

Inverted

B

Upright

C

Infinite

D

Finite

Question 134: Palette 134/202

Errorless MP PMT 1999 MCQ

An ecosystem may be defined as

A

A localised association of several plants and animals

B

Different communities of plants, animals and microbes together with their physico-chemical environments

C

Different communities of plants and microbesplus their physicochemical environments

D

Rate of decomposition of other components will be very high

Question 135: Palette 135/202

Errorless BHU 1999 MCQ

Among the plants listed, point out one that does not fit into ecological group represented by other plants

A

Acacia

B

Rhizophora/Vallisneria

C

Euphorbia

D

Aloe

Question 136: Palette 136/202

Errorless MP PMT 1999; CBSE PMT 2001 MCQ

Food chains are met with only in the

A

Sea

B

Cities

C

Forests

D

In all the places

Question 137: Palette 137/202

Errorless MP PMT 1998; BHU 2002 MCQ

The pyramid of number in a grassland ecosystem is

A

Always erect

B

Always inverted

C

Either erect or inverted

D

Irregular

Question 138: Palette 138/202

Errorless MP PMT 1998 MCQ

The number of individuals of a species in a particular ecosystem at a given time remains constant due to

A

Man

B

Parasites

C

Predators

D

Available food

Question 139: Palette 139/202

Errorless CPMT 1998 MCQ

Ecosystem is defined as

A

Relation between plants and animals

B

Relation between biotic and physical components

C

Relation between producers and decomposers

D

None of these

Question 140: Palette 140/202

Errorless CPMT 1998; BHU 2001, 06; Pb. PMT 2004 MCQ

Decomposers are

A

Autotrophs

B

Heterotrophs

C

Autoheterotrophs

D

Organotrophs

Question 141: Palette 141/202

Errorless CBSE PMT 1998 MCQ

In a terrestrial ecosystem such as forest, maximum energy is in which trophic level

A

$T_{1}$

B

$T_{2}$

C

$T_{3}$

D

$T_{4}$

Question 142: Palette 142/202

Errorless CBSE PMT 1998; BHU 1999; Kerala CET 2003 MCQ

The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem's Or In an ecosystem the rate of production of organic matter during photosynthesis is termed as [AIPMT (Cancelled) 2015]

A

Net primary productivity

B

Gross secondary productivity

C

Net secondary productivity

D

Gross primary productivity

Question 143: Palette 143/202

Errorless AIIMS 1998 MCQ

The relationship in an ecosystem can be depicted in

A

Pyramid of energy

B

Pyramid of biomass

C

Pyramid of numbers

D

All of these

Question 144: Palette 144/202

Errorless CBSE PMT 1997 MCQ

Which of the following acts as “nature’s scavengers”

A

Man

B

Animals

C

Insects

D

Micro-organisms

Question 145: Palette 145/202

Errorless RPMT 1997 MCQ

In a tree ecosystem, the pyramid of number is

A

Upright

B

Inverted

C

Both of the above

D

None of the above

Question 146: Palette 146/202

Errorless CBSE PMT 1997, 2004 MCQ

Which of the following ecosystem has the highest gross primary productivity Or Among the ecosystem mentioned below where can one find maximum biodiversity [NCERT]

A

Grassland

B

Coral reef

C

Mangroves

D

Rain forest

Question 147: Palette 147/202

Errorless MP PMT 1997 MCQ

In an ecosystem bacteria are considered as

A

Microconsumers

B

Macroconsumers

C

Primary consumers

D

Secondary consumers

Question 148: Palette 148/202

Errorless MP PMT 1997 MCQ

A lake ecosystem is

A

Artificial

B

Abiotic

C

Natural

D

Hydrological

Question 149: Palette 149/202

Errorless MP PMT 1997 MCQ

Ecological pyramids are of

A

Two types

B

Three types

C

Four types

D

Five types

Question 150: Palette 150/202

Errorless RPMT 1997 MCQ

Which of the following ecosystems would be most stable

A

Man made forest

B

Fresh water lake

C

Saline lake

D

Natural forest

Question 151: Palette 151/202

Errorless RPMT 1997 MCQ

The living organisms of all ecosystems collectively constitute

A

Producers

B

Decomposers

C

Consumers

D

Biosphere

Question 152: Palette 152/202

Errorless CBSE PMT 1996; MHCET 2001 MCQ

10% law of flow of energy in ecosystem was proposed by

A

Lindeman

B

Carl Mobius

C

Tansley

D

Darwin

Question 153: Palette 153/202

Errorless CBSE PMT 1996 MCQ

If forest area is reduced to half, which one of the following will be a long term effect

A

The natives (tribals) of that area will die on account of hunger

B

Cattles of that area will die due to scarcity of fodder

C

The diversity in germplasm will effect the crop breeding

D

It will be converted into large desert

Question 154: Palette 154/202

Errorless MP PMT 1996, 99 MCQ

The first link in any food chain is always a green plant because

A

They are widely distributed

B

They are firmly fixed to the soil

C

They alone have a capacity to fix atmospheric $\mathrm{CO}_{2}$ in the presence of sunlight

D

All of the above

Question 155: Palette 155/202

Errorless MP PMT 1996 MCQ

Food levels in an ecosystem are called

A

Trophic levels

B

Consumer levels

C

Producer levels

D

Herbivore levels

Question 156: Palette 156/202

Errorless Bihar PMT 1995; MP PMT 2000; CPMT 2002; RPMT 2005; Odisha JEE 2011; J & K CET 2012 MCQ

Which of the following is source of energy to an ecosystem [NCERT Pg. No. 206]

A

Solar energy

B

Sugar stored

C

Heat liberated during respiration

D

ATP

Question 157: Palette 157/202

Errorless MP PMT 1995 MCQ

The number of primary producer within a specified area would be maximum in

A

River

B

Pond ecosystem

C

Lake

D

Estuary

Question 158: Palette 158/202

Errorless CPMT 1995, 2002; EAMCET 1996; MP PMT 1997, 2001; BHU 2002; RPMT 2005; NEET (Phase-I) 2016 MCQ

The word “ecosystem” was first coined by

A

Weaver and Clements

B

A.G. Tansley

C

E.P. Odum

D

By all the above

Question 159: Palette 159/202

Errorless RPMT 1995 MCQ

Which of the following abundantly occurs in pond ecosystem Or In a food chain, which of the following produces in the largest amount [CBSE PMT 1996]

A

Producer

B

Consumer

C

Top consumer

D

Decomposers

Question 160: Palette 160/202

Errorless CBSE PMT 1995; MHCET 2000; MP PMT 2000; BHU 2002 MCQ

Which of the following is the most stable and largest ecosystem of the world

A

Mountain

B

Desert

C

Forest

D

Ocean

Question 161: Palette 161/202

Errorless CBSE PMT 1995; BVP 2001; MHCET 2001 MCQ

In a biotic community, primary consumers are

A

Omnivores

B

Carnivores

C

Detritivores

D

Herbivores

Question 162: Palette 162/202

Errorless EAMCET 1995; MHCET 2003 MCQ

In a food chain, lion is a

A

Secondary consumer

B

Primary consumer

C

Tertiary consumer

D

Secondary producer

Question 163: Palette 163/202

Errorless EAMCET 1995; BHU 2000, 01; AFMC 2001; MHCET 2003 MCQ

In a pond ecosystem, benthos means

A

Primary consumers in the depth of a pond

B

Zooplankton on the water surface

C

Periphyton

D

Epineuston

Question 164: Palette 164/202

Errorless CBSE PMT 1994 MCQ

The character of an ecosystem is determined by the environmental factor which is shortest supply. This is the

A

Law of minimum

B

Law of diminishing returns

C

Law of limiting factors

D

Law of supply and demand

Question 165: Palette 165/202

Errorless JIPMER 1994; Kerala PMT 2004; KCET 2018 MCQ

Which must be preserved in an ecosystem, if the system is to be maintained

A

Producers and carnivores

B

Producers and decomposers

C

Carnivores and decomposers

D

Herbivores and carnivores

Question 166: Palette 166/202

Errorless MP PMT 1994, 95, 97, 2002 MCQ

The pyramid of energy in a forest ecosystem is

A

Always upright

B

Always inverted

C

Both upright and inverted

D

None of the above

Question 167: Palette 167/202

Errorless KCET 1994; MP PMT 1995, 2002 MCQ

In an ecosystem, there is flow of energy at different trophic levels. This is as follows

A

Primary consumers — Tertiary consumers — Secondary consumers — Decomposers — Producers

B

Producers — Primary consumers — Secondary consumers — Tertiary consumers — Decomposers

C

Producers — Decomposers — Primary consumers — Tertiary consumers — Secondary consumers

D

Producers — Primary consumers — Tertiary consumers — Secondary consumers — Decomposers

Question 168: Palette 168/202

Errorless KCET 1994 MCQ

We refer to the following as the food chain

A

Large number of animals near a source of food

B

Transfer of food energy from the green plants through a series of consumer organisms

C

Large number of human beings forming a human chain near a source of food

D

None of these

Question 169: Palette 169/202

Errorless MP PMT 1994, 98; MHCET 2003 MCQ

Biological equilibrium is found among the

A

Producer plants

B

Consumers and producers

C

Decomposers

D

Producers, consumers and decomposers

Question 170: Palette 170/202

Errorless MP PMT 1994 MCQ

Which of the following word is related to Homo sapiens

A

Herbivore

B

Carnivore

C

Autotroph

D

Omnivore

Question 171: Palette 171/202

Errorless CPMT 1993; MP PMT 1995; BVP 2002 MCQ

Nepenthes is a

A

Primary producer

B

Consumer

C

Primary producer and consumer

D

None of the above

Question 172: Palette 172/202

Errorless CBSE PMT 1993 MCQ

The pyramid of number is based on

A

Unit per area

B

Food per individual

C

Individuals in trophic level

D

None of these

Question 173: Palette 173/202

Errorless MP PMT 1993, 98, 99; BHU 2000 MCQ

Ecosystem has two components

A

Plants and animals

B

Weeds and trees

C

Biotic and abiotic

D

Frog and men

Question 174: Palette 174/202

Errorless MP PMT 1993, 2011 MCQ

Ecosystem creates

A

Food chain

B

Food web

C

Both the above

D

None of the above

Question 175: Palette 175/202

Errorless MP PMT 1993; Bihar PMT 2005; MP PMT 2005 MCQ

In lake ecosystem, pyramid biomass is

A

Upright

B

Inverted

C

Anything is possible

D

None is correct

Question 176: Palette 176/202

Errorless MP PMT 1993 MCQ

In forest ecosystem, pyramid of number is

A

Upright

B

Inverted

C

Any of the two

D

None of the above

Question 177: Palette 177/202

Errorless RPMT 1992 MCQ

What is maximum in a pond-ecosystem

A

Primary consumers

B

Secondary consumers

C

Producers

D

Decomposers

Question 178: Palette 178/202

Errorless CBSE PMT 1991 MCQ

Which of the following is correct sequence in food chain

A

Fallen leaves → bacteria → insect larvae → birds

B

Phytoplankton → zooplankton → fish

C

Grasses → fox → rabbit

D

Grasses → chameleon → insects → birds

Question 179: Palette 179/202

Errorless MCQ

The figure given below shows a particular food web. Each alphabet represents a different species. Arrows indicate the flow of energy and materials. Which of the following would probably have the greatest total biomass [NCERT]

A

K+M

B

K

C

J+G

D

F

Question 180: Palette 180/202

Errorless MCQ

The figure given below shows estimated values for carbon fixation in a terrestrial ecosystem. Diagram refer to tones $\times 10^{9}$ , fixed or available for fixation Which result can be drawn from the figure

A

There is a net loss to the decomposers

B

There is a net loss to the atmosphere

C

The system is in balance

D

There is an net gain to the producers

Question 181: Palette 181/202

Errorless MCQ

Using the figure, determine which animals would be found in the same trophic level [NCERT]
A. Trophic level
(A) Trophic level - 4, Feeding strategy - Secondary carnivore, Grazing food chain - Cooper’s hawk, Decomposer food chain - Owl
(B) Trophic level - 3, Feeding strategy - Carnivore, Grazing food chain - Robin, Decomposer food chain - Shrew
(C) Trophic level - 2, Feeding strategy - Herbivore, Grazing food chain - Cricket, Decomposer food chain - Earthworm
(D) Trophic level - 1, Feeding strategy - Autotroph, Grazing food chain - Maple tree leaves, Decomposer food chain - Dead maple leaves
B. Pyramid of productivity

A

Humans and horses

B

Eagles and blue jays

C

Pine trees and garden snakes

D

Crickets and cows

Question 182: Palette 182/202

Errorless MCQ

The following figure is best example of

A

Pyramid of number in forest ecosystem

B

Pyramid of number in grassland ecosystem

C

Pyramid of biomass in forest ecosystem

D

Pyramid of number in parasitic food chain

Question 183: Palette 183/202

Errorless MCQ

In an ecosystem, the population of [NCERT Pg. No. 209]

A

Primary producers are more than that of primary consumers

B

Secondary consumers are largest because they are powerful

C

Primary consumers out number primary producers

D

Primary consumers are least dependent upon primary producers

Question 184: Palette 184/202

Errorless MCQ

In the following simplified model of a nutrient cycle, identify A, B, C, D and E [NCERT] Rock minerals

A

A – Producers, B – Soil solution, C – Detritus, D – Weathering, E – Decomposition

B

A – Producers, B – Soil solution, C – Detritus, D – Decomposition, E – Weathering

C

A – Producers, B – Detritus, C – Soil solution, D – Weathering, E – Decomposition

D

A – Producers, B – Detritus, C – Soil solution, D – Decomposition, E – Weathering

Question 185: Palette 185/202

Errorless MCQ

The importance of ecosystem lies in

A

Cycling of materials

B

Flow of energy

C

Both the above

D

None of the above

Question 186: Palette 186/202

Errorless MCQ

Decomposers like fungi and bacteria are
(i) Autotrophs
(ii) Heterotrophs
(iii) Saprotrophs
(iv) Chemo-autotrophs

A

i and iii

B

i and iv

C

ii and iii

D

i and ii

Question 187: Palette 187/202

Errorless MCQ

The process of mineralization by microorganisms helps in the release of

A

Inorganic nutrients from humus

B

Both organic and inorganic nutrients from detritus

C

Organic nutrients from humus

D

Inorganic nutrients from detritus and formation of humus

Question 188: Palette 188/202

Errorless MCQ

Productivity is the rate of production of biomass expressed in term of
(i) $(kcal\ m^{-3})yr^{-1}$
(ii) $g^{-2}\ yr^{-1}$
(iii) $g^{-1}\ yr^{-1}$
(iv) $(kcal\ m^{-2})yr^{-1}$

A

ii

B

iii

C

ii and iv

D

i and iii

Question 189: Palette 189/202

Errorless MCQ

Edaphic factor refers to

A

Water

B

Soil

C

Relative humidity

D

Altitude

Question 190: Palette 190/202

Errorless MCQ

Which of the following is not a producer [NCERT]

A

Spirogyra

B

Agaricus

C

Volvox

D

Nostoc

Question 191: Palette 191/202

Errorless MCQ

Which of the following is an ecosystem service provided by a natural ecosystem?

A

Cycling of nutrients

B

Prevention of soil erosion

C

Pollutant absorption and reduction of the threat of global warming

D

All of the above

Question 192: Palette 192/202

Errorless MCQ

Pyramid of numbers is [NCERT]

A

Always upright

B

Always inverted

C

Either upright or inverted

D

Neither upright nor inverted

Question 193: Palette 193/202

Errorless MCQ

Approximately how much of the solar energy that falls on the leaves of a plants is converted to chemical energy by photosynthesis

A

Less than $1\%$

B

$2 - 10\%$

C

$30\%$

D

$50\%$

Question 194: Palette 194/202

Errorless MCQ

Among the following, where do you think the process of decomposition would be the fastest [NCERT]

A

Tropical rain forest

B

Antarctic

C

Dry and region

D

Alpine region

Question 195: Palette 195/202

Errorless MCQ

How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores

A

1%

B

10%

C

40%

D

90%

Question 196: Palette 196/202

Errorless MCQ

If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be

A

Scavenger

B

Tertiary producer

C

Tertiary consumer

D

Secondary consumer

Question 197: Palette 197/202

Errorless MCQ

Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation and mean annual rainfall is below 100mm [NCERT]

A

Grassland

B

Shrubby forest

C

Desert

D

Mangrove

Question 198: Palette 198/202

Errorless MCQ

The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called [NCERT]

A

Pelagic zone

B

Benthic zone

C

Lentic zone

D

Littoral zone

Question 199: Palette 199/202

Errorless MCQ

If we completely remove the decomposers from an ecosystem, the ecosystem functioning will be adversely affected because

A

Mineral movement will be blocked

B

Herbivores will not receive solar energy

C

Energy flow will be blocked

D

Rate of decomposition of other components will be very high

Question 200: Palette 200/202

Errorless MCQ

The figure shows a pyramid of energy which represents energy loss from a food chain to decomposers, upward transfer of energy to the next trophic level and energy loss through respiration. All diagram are in $kKm^{-2}Y^{-1}$ What is illustrated from this figure

A

The energy of the final trophic level is not used

B

Food chain efficiency is about $10\%$

C

Energy loss to decomposers is higher than respiratory loss

D

A pyramid of energy shows the nutrient transfer less clearly than a pyramid of numbers

Question 201: Palette 201/202

Errorless MCQ

The second trophic level of longer food chains in a lake is

A

Phytoplankton

B

Zooplankton

C

Benthos

D

Fishes

Question 202: Palette 202/202

Errorless MCQ

The figure given below represents the flow of materials between trophic levels. Which arrow is not correct

A

IV

B

III

C

II

D

I