Question 1: Palette 1/87

NEET 2026 MCQ

$ \text { Match List I with List II : } $

$ \text { List-I } $		$ \text { List-II } $
A.	Productivity	I.	Gross primary productivity minus respiration losses
B.	Net primary productivity	II.	Rate of formation of new organic matter by consumers
C.	Gross primary productivity	III.	Rate of biomass production
D.	Secondary productivity	IV.	Rate of production of organic matter during photosynthesis

Choose the correct answer from the options given below :

A

A-III, B-I, C-IV, D-II

B

A-I, B-II, C-III, D-IV

C

A-I, B-III, C-IV, D-II

D

A-III, B-I, C-II, D-IV

Question 2: Palette 2/87

NEET 2026 MCQ

$ \text { Match List I with List II: } $

List-I (Phase of cell cycle)		List-II (Activity)
A.	Decomposition	I.	Accumulation of dark coloured amorphous colloidal substance
B.	Detritus	II.	Release of inorganic nutrients by the activity of microbes in soil
C.	Mineralisation	III.	Breaking down of complex organic matter into inorganic substances.
D.	Humification	IV.	Dead remains of plants and animals including fecal matter

Choose the correct answer from the options given below:

A

A-IV, B-III, C-I, D-II

B

A-III, B-IV, C-II, D-I

C

A-I, B-II, C-III, D-IV

D

A-III, B-II, C-I, D-IV

Question 3: Palette 3/87

NEET 2026 MCQ

Ecological pyramids represent the relationship between the organisms at different trophic levels and they are generally inverted for:

A

Pyramid of number in grassland

B

Pyramid of energy in pond ecosystem

C

Pyramid of biomass in grassland

D

Pyramid of biomass in sea

Question 4: Palette 4/87

NEET 2026 MCQ

Which of the following are primary consumers in a food chain?

A

Carnivores

B

Parasites

C

Predators

D

Herbivores

Question 5: Palette 5/87

NEET 2026 MCQ

Which of the following statements are Correct?

(a) Energy flow from producers to consumers is unidirectional

(b) Energy pyramid can never be inverted

(c) Transfer of energy follows the $1 \%$ law

Choose the correct answer from the options given below :

A

(b) and (c) only

B

(a), (b) and (c)

C

(a) and (b) only

D

(a) and (c) only

Question 6: Palette 6/87

NEET 2025 MCQ

Given below are two statements:

Statement I: The primary source of energy in an ecosystem is solar energy.

Statement II : The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP).

In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but statement II is incorrect

B

Statement I is incorrect but statement II is correct

C

Both statement I and statement II are correct

D

Both statement I and statement II are incorrect

Question 7: Palette 7/87

NEET 2025 MCQ

Who is known as the father of Ecology in India?

A

Ram Udar

B

Birbal Sahni

C

S.R. Kashyap

D

Ramdeo Misra

Question 8: Palette 8/87

NEET 2025 MCQ

Given below are two statements:

Statement I: In ecosystem, there is unidirectional flow of energy of sun from producers to consumers.

Statement II: Ecosystems are exempted from 2nd law of thermodynamics.

In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but statement II is incorrect

B

Statement I is incorrect but statement II is correct

C

Both statement I and statement II are correct

D

Both statement I and statement II are incorrect

Question 9: Palette 9/87

NEET 2025 MCQ

Which of the following is the unit of productivity of an Ecosystem?

A

$\mathrm{KCal} ~\mathrm{m}^{-3}$

B

$\left(\mathrm{KCal} ~\mathrm{m}{ }^{-2}\right) \mathrm{yr}^{-1}$

C

$\mathrm{gm}^{-2}$

D

$\mathrm{KCal} ~\mathrm{m}^{-2}$

Question 10: Palette 10/87

NEET 2024 MCQ

Consider the pyramid of energy of an ecosystem given below:

If T$_4$ is equivalent to $1000 \mathrm{~J}$, what is the value at $\mathrm{T}_1$ ?

A

$\frac{10000}{10} \mathrm{~J}$

B

$\frac{10000}{10} \times 4 \mathrm{~J}$

C

10,000 J

D

10,00,000 J

Question 11: Palette 11/87

NEET 2024 MCQ

Which one of the following is not a limitation of ecological pyramids?

A

Saprophytes are not given any place in ecological pyramids

B

It assumes a simple food chain, that almost never exists in nature

C

It accommodates a food web

D

It does not take into account the same species belonging to two or more trophic levels

Question 12: Palette 12/87

NEET 2024 MCQ

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

A

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

B

$x\left(\mathrm{kcal} \mathrm{~m}^{-2}\right) \mathrm{yr}^{-1}$

C

$10 x\left(\mathrm{kcal} \mathrm{~m}^{-2}\right) \mathrm{yr}^{-1}$

D

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

Question 13: Palette 13/87

NEET 2023 MCQ

Match List - I with List - II

	List - I		List - II
(A)	Hydrarch succession	(I)	Gradual change in the species composition
(B)	Xerarch succession	(II)	Faster and climax reached quickly
(C)	Ecological succession	(III)	Lichens to mesic conditions
(D)	Secondary succession	(IV)	Phytoplankton to mesic conditions

Choose the correct answer from the options given below :

A

(A)-(IV), (B)-(II), (C)-(III), (D)-(I)

B

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

C

(A)-(I), (B)-(IV), (C)-(II), (D)-(III)

D

(A)-(IV), (B)-(III), (C)-(I), (D)-(II)

Question 14: Palette 14/87

NEET 2023 MCQ

The amount of nutrients such as carbon, nitrogen, potassium and calcium present in the soil at any given time is referred to as :

A

Standing state

B

Standing crop

C

Humus

D

Detritus

Question 15: Palette 15/87

NEET 2023 MCQ

The species of plants that plays a vital role in controlling the relative abundance of other species in a community is called _________.

A

alien species

B

endemic species

C

exotic species

D

keystone species

Question 16: Palette 16/87

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.

Choose the correct answer from the options given below :

A

B, C, D only

B

C, D, E only

C

D, E, A only

D

A, B, C only

Question 17: Palette 17/87

NEET 2023 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 18: Palette 18/87

NEET 2023 MCQ

Which one of the following statements is NOT correct?

A

Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries

B

Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body

C

The amount of some toxic substances of industrial waste water increases in the organisms at successive trophic levels

D

The micro-organisms involved in biodegradation of organic matter in a sewage polluted water body consume a lot of oxygen causing the death of aquatic organisms

Question 19: Palette 19/87

NEET 2023 MCQ

Match List I with List II:

	List I (Interaction)		List II (Species A and B)
(A)	Mutualism	(I)	+(A), 0(B)
(B)	Commensalism	(II)	$-$(A), 0(B)
(C)	Amensalism	(III)	+(A), $-$(B)
(D)	Parasitism	(IV)	+(A), +(B)

Choose the correct answer from the options given below:

A

A-IV, B-I, C-II, D-III

B

A-IV, B-III, C-I, D-II

C

A-III, B-I, C-IV, D-II

D

A-IV, B-II, C-I, D-III

Question 20: Palette 20/87

NEET 2022 MCQ

All successions irrespective of the habitat proceed to which type of climax community?

A

Edaphic

B

Xeric

C

Mesic

D

Hydrophytic

Question 21: Palette 21/87

NEET 2022 MCQ

The pioneer species in a hydrarch succession are

A

Filamentous algae

B

Free-floating angiosperms

C

Submerged rooted plants

D

Phytoplanktons

Question 22: Palette 22/87

NEET 2022 MCQ

The species that come to appear in bare area are called

A

Species of seral community

B

Pioneer species

C

Invasive species

D

Competitive species

Question 23: Palette 23/87

NEET 2022 MCQ

The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called

A

Net primary production

B

Secondary production

C

Primary production

D

Gross primary production

Question 24: Palette 24/87

NEET 2022 MCQ

Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together, they may avoid competition in the same garden by :

A

Predating on each other

B

Feeding at the same time

C

Choosing different foraging patterns

D

Increasing time spent on attacking each other

Question 25: Palette 25/87

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

Both Statement I and Statement II are correct

B

Both Statement I and Statement II are incorrect

C

Statement I is correct but Statement II is incorrect

D

Statement I is incorrect but Statement II is correct

Question 26: Palette 26/87

NEET 2022 MCQ

Which one of the following will accelerate phosphorus cycle?

A

Burning of fossil fuels

B

Volcanic activity

C

Weathering of rocks

D

Rain fall and storms

Question 27: Palette 27/87

NEET 2022 MCQ

Detritivores breakdown detritus into smaller particles. This process is called :

A

Catabolism

B

Fragmentation

C

Humification

D

Decomposition

Question 28: Palette 28/87

NEET 2021 MCQ

The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as :

A

Standing crop

B

Climax

C

Climax community

D

Standing state

Question 29: Palette 29/87

NEET 2021 MCQ

Which of the following statements is not correct?

A

Pyramid of numbers in a grassland ecosystem is upright

B

Pyramid of biomass in sea is generally inverted.

C

Pyramid of biomass in sea is generally upright.

D

Pyramid of energy is always upright.

Question 30: Palette 30/87

NEET 2021 MCQ

In the equation GPP - R = NPP

R represents :

A

Respiration losses

B

Radiant energy

C

Retardation factor

D

Environmental factor

Question 31: Palette 31/87

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 more than net primary productivity

C

Gross primary productivity is always less than net primary productivity

D

Gross primary productivity and Net primary productivity are one and same

Question 32: Palette 32/87

NEET 2020 MCQ

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

(A) Fourth trophic level   (i) Crow
(B) Second trophic level  (ii) Vulture
(C) First trophic level      (iii) Rabbit
(D) Third trophic level    (iv) Grass

Select the correct option

A

(A) $ \to $ (iv), (B) $ \to $ (iii), (C) $ \to $ (ii), (D) $ \to $ (i)

B

(A) $ \to $ (ii), (B) $ \to $ (iii), (C) $ \to $ (iv), (D) $ \to $ (i)

C

(A) $ \to $ (i), (B) $ \to $ (ii), (C) $ \to $ (iii), (D) $ \to $ (iv)

D

(A) $ \to $ (iii), (B) $ \to $ (ii), (C) $ \to $ (i), (D) $ \to $ (iv)

Question 33: Palette 33/87

NEET 2019 MCQ

Which of the following is the most important cause for animals and plants being driven to extinction?

A

Economic exploitation

B

Alien species invasion

C

Habitat loss and fragmentation

D

Drought and floods

Question 34: Palette 34/87

NEET 2019 MCQ

Which of the following ecological pyramids is generally inverted?

A

Pyramid of biomass in a forest

B

Pyramid of biomass in a sea

C

Pyramid of numbers in grassland

D

Pyramid of energy

Question 35: Palette 35/87

NEET 2018 MCQ

What type of ecological pyramid would be 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 36: Palette 36/87

NEET 2017 MCQ

Which ecosystem has the maximum biomass ?

A

Pond ecosystem

B

Lake ecosystem

C

Grassland ecosystem

D

Forest ecosystem

Question 37: Palette 37/87

NEET 2016 MCQ

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

A

chemosynthetic bacteria

B

coral reefs

C

green algae

D

blue-green algae

Question 38: Palette 38/87

NEET 2016 MCQ

Which one of the following is a characteristic feature of cropland ecosystem ?

A

Absence of weeds

B

Absence of soil organisms

C

Ecological succession

D

Least genetic diversity

Question 39: Palette 39/87

NEET 2016 MCQ

The term ecosystem was coined by :

A

E.P. Odum

B

E. Haeckel

C

E. Warming

D

A.G. Tansley

Question 40: Palette 40/87

NEET 2016 MCQ

Which of the following would appear as the pioneer organisms on bare rocks?

A

Lichens

B

Green algae

C

Liverworts

D

Mosses

Question 41: Palette 41/87

NEET 2015 MCQ

During ecological succession :

A

the establishment of a new biotic community is very fast in its primary phase.

B

the numbers and types of animals remain constant.

C

the changes lead to a ommunity that is in near equilibrium with the environment and is called pioneer community

D

the gradual and predictable change in species composition occurs in a given area

Question 42: Palette 42/87

NEET 2015 MCQ

In which of the following both pairs have correct combination?

A

Gaseous nutrient cycle	Carbon and Sulphur
Sedimentary nutrient cycle	Nitrogen and Phosphorus

B

Gaseous nutrient cycle	Sulphur and Phosphorus
Sedimentary nutrient cycle	Carbon and Nitrogen

C

Gaseous nutrient cycle	Nitrogen and Sulphur
Sedimentary nutrient cycle	Carbon and Phosphorus

D

Gaseous nutrient cycle	Carbon and Nitrogen
Sedimentary nutrient cycle	Sulphur and Phosphorus

Question 43: Palette 43/87

NEET 2015 MCQ

Most animals that live in deep oceanic waters are -

A

primary consumers

B

detritivores

C

tertiary consumers

D

secondary consumers

Question 44: Palette 44/87

NEET 2015 MCQ

The mass of living material at a trophic level at a particular time is called :

A

Net primary productivity

B

Standing state

C

Standing crop

D

Gross primary productivity

Question 45: Palette 45/87

NEET 2015 MCQ

Secondary Succession takes place on/in :

A

Newly created pond

B

Newly cooled lava

C

Bare rock

D

Degraded forest

Question 46: Palette 46/87

NEET 2015 MCQ

In an ecosystem the rate of production of organic matter during photosynthesis is termed as :

A

Secondary productivity

B

Net Productivity

C

Net primary productivity

D

Gross primary productivity

Question 47: Palette 47/87

NEET 2015 MCQ

Vertical distribution of different species occupying different levels in a biotic community is known as :

A

Stratification

B

Pyramid

C

Divergence

D

Zonation

Question 48: Palette 48/87

NEET 2015 MCQ

Most animals are tree dwellers in a:

A

temperate deciduous forest

B

tropical rain forest

C

coniferous forest

D

thorn woodland

Question 49: Palette 49/87

NEET 2014 MCQ

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.

A

A $ \to $ Detritus , B $ \to $ Rock minerals, C $ \to $ Producer , D $ \to $ Litter fall

B

A $ \to $ Litter fall , B $ \to $ Producers , C $ \to $ Rock minerals , D $ \to $ Detritus

C

A $ \to $ Rock Minerals, B $ \to $ Detritus, C $ \to $ Litter fall , D $ \to $ Producers

D

A $ \to $ Producers , B $ \to $ Litter fall , C $ \to $ Rock minerals , D $ \to $ Detritus

Question 50: Palette 50/87

NEET 2014 MCQ

Match the following and select the correct option:

(a) Earthworm	(i) Pioneer species
(b) Succession	(ii) Detritivore
(c) Ecosystem service	(iii) Natality
(d) Population growth	(iv) Pollination

A

(a) $ \to $ (i), (b) $ \to $ (ii), (c) $ \to $ (iii), (d) $ \to $ (iv)

B

(a) $ \to $ (iii), (b) $ \to $ (ii), (c) $ \to $ (iv), (d) $ \to $ (i)

C

(a) $ \to $ (iv), (b) $ \to $ (i), (c) $ \to $ (iii), (d) $ \to $ (ii)

D

(a) $ \to $ (ii), (b) $ \to $ (i), (c) $ \to $ (iv), (d) $ \to $ (iii)

Question 51: Palette 51/87

NEET 2014 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

0.0002 J

B

0.002 J

C

0.2 J

D

0.02 J

Question 52: Palette 52/87

NEET 2013 MCQ

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N₂) to the atmosphere ?

A

Anaerobic ammonium oxidation, and denitrificatrion

B

Aerobic nitrate oxidation, and nitrite reduction

C

Enteric fermentation in cattle, and nitrogen fixation by Rhizobium in root nodules of legumes

D

Decomposition of organic nitrogen, and conversion of dinitrogen to ammonium compounds

Question 53: Palette 53/87

NEET 2013 MCQ

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

A

Phytoplankton

B

Lion

C

Grasshopper

D

Wolf

Question 54: Palette 54/87

NEET 2013 MCQ

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

A

Zooplankton

B

Fish

C

Small plants

D

Man

Question 55: Palette 55/87

NEET 2013 MCQ

Which one of the following processes during decomposition is correctly described ?

A

Catabolism – Last step in the decomposition under fully anaerobic condition

B

Leaching – Water soluble inorganic nutrients rise to the top layers of soil

C

Fragmentation –Carried out by organisms such as earthworm

D

Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate

Question 56: Palette 56/87

NEET 2013 MCQ

Natural reservoir of phosphorus is :

A

Fossils

B

Rock

C

Sea water

D

Animal bones

Question 57: Palette 57/87

NEET 2013 MCQ

Secondary productivity is rate of formation of new organic matter by :

A

Parasite

B

Decomposer

C

Producer

D

Consumers

Question 58: Palette 58/87

NEET 2012 MCQ

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

A

Net productivity

B

Gross primary productivity

C

Secondary productivity

D

Net primary productivity

Question 59: Palette 59/87

NEET 2012 MCQ

The second stage of hydrosere is occupied by plants like

A

Vallisneria

B

Typha

C

Azolla

D

Salix

Question 60: Palette 60/87

NEET 2012 MCQ

Identify the likely organisms (a), (b), (c) and (d) in the food web shown below :

A

(a) $ \to $ deer , (b) $ \to $ rabbit , (c) $ \to $ frog, (d) $ \to $ rat

B

(a) $ \to $ squirrel , (b) $ \to $ cat, (c) $ \to $ rat , (d) $ \to $ pigeon

C

(a) $ \to $ dog, (b) $ \to $ squirrel , (c) $ \to $ bat , (d) $ \to $ deer

D

(a) $ \to $ rat , (b) $ \to $ dog , (c) $ \to $ tortoise, (d) $ \to $ crow

Question 61: Palette 61/87

NEET 2012 MCQ

The upright pyramid of number is absent in

A

Pond

B

Grassland

C

Lake

D

Forest

Question 62: Palette 62/87

NEET 2012 MCQ

Identify the possible link "A" in the following food chain :
Plant → insect → frog →"A"→ Eagle

A

Wolf

B

Rabbit

C

Cobra

D

Parrot

Question 63: Palette 63/87

NEET 2012 MCQ

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

A

Energy flow

B

Decomposition

C

Productivity

D

Stratification

Question 64: Palette 64/87

NEET 2012 MCQ

Giiven 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 "rats" and level SC is "cats"

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 "insects" and level SC is "small insectivorous birds"

Question 65: Palette 65/87

NEET 2012 MCQ

Which one of the following is not a gaseous biogeochemical cycle in ecosystem ?

A

Sulphur Cycle

B

Nitrogen Cycle

C

Phosphorus Cycle

D

Carbon Cycle

Question 66: Palette 66/87

NEET 2011 MCQ

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

A

Lion

B

Frog

C

Goat

D

Sparrow

Question 67: Palette 67/87

NEET 2011 MCQ

Both, hydrarch and xerarch successions lead to :

A

Xeric conditions

B

Excessive wet conditions

C

Highly dry conditions

D

Medium water conditions

Question 68: Palette 68/87

NEET 2011 MCQ

The breakdown of detritus into smaller particles by earthworm is a process called

A

Fragmentation

B

Catabolism

C

Mineralisation

D

Humification

Question 69: Palette 69/87

NEET 2011 MCQ

Of the total incident solar radiation the proportion of PAR is

A

About 60%

B

More than 80%

C

Less than 50%

D

About 70%

Question 70: Palette 70/87

NEET 2011 MCQ

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

A

It shows energy content of different trophic level organisms

B

It is upright in shape

C

It is inverted in shape

D

Its base is broad

Question 71: Palette 71/87

NEET 2011 MCQ

Mass of living matter at a trophic level in an area at any time is called :

A

Humus

B

Detritus

C

Standing state

D

Standing crop

Question 72: Palette 72/87

NEET 2011 MCQ

Which one of the following statements is correct for secondary succession?

A

It follows primary succession

B

It occurs on deforested site

C

It is similar to primary succession except that it has a relatively fast pace.

D

It begins on a bare rock.

Question 73: Palette 73/87

NEET 2010 MCQ

Which of the following representations shows the pyramid of numbers in a forest ecosystem ?

1

B

2

A

3

D

4

C

Question 74: Palette 74/87

NEET 2010 MCQ

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

A

Standing crop

B

Net primary productivity

C

Gross primary productivity

D

Secondary productivity

Question 75: Palette 75/87

NEET 2009 MCQ

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

A

Phytoplankton

B

Zooplankton

C

Frog

D

Fish

Question 76: Palette 76/87

NEET 2009 MCQ

The correct sequence of plants in hydrosere is :

A

Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak

B

Pistia → Volvox → Scirpus → Hydrilla → Oak → Lantana

C

Oak → Lantana → Volvox → Hydrilla → Pistia → Scirpus

D

Oak → Lantana → Scirpus → Pistia → Hydrilla → Volvox

Question 77: Palette 77/87

NEET 2008 MCQ

Consider the following statements concerning food chains:
(i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(ii) Removal of most of the carnivores resulted in an increased population of deers
(iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss
(iv) The length of food chains may vary from 2 to 8 trophic levels
Which of two of the above statements are correct ?

A

(iii), (iv)

B

(ii), (iii)

C

(i), (iv)

D

(i), (ii)

Question 78: Palette 78/87

NEET 2008 MCQ

The slow rate of decomposition of fallen logs in nature is due to their:

A

low moisture content

B

poor nitrogen content

C

anaerobic environment around them

D

low cellulose content

Question 79: Palette 79/87

NEET 2008 MCQ

About 70% of total global carbon is found in:

A

Grasslands

B

Agroecosystems

C

Oceans

D

Forests

Question 80: Palette 80/87

NEET 2007 MCQ

Which one of the following ecosystem types has the highest annual net primary productivity ?

A

Temperate evergreen forest

B

Temperate deciduous forest

C

Tropical rain forest

D

Tropical deciduous forest

Question 81: Palette 81/87

NEET 2006 MCQ

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

A

Rate of energy flow

B

Dry weight

C

Fresh weight

D

Number of individuals

Question 82: Palette 82/87

NEET 2004 MCQ

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

A

High stability and high resilience

B

Low stability and high resilience

C

High stability and low resilience

D

Low stability and low resilience

Question 83: Palette 83/87

NEET 2004 MCQ

Which of the following is expected to have the highest value (gm/m²/yr) in a grassland ecosystem ?

A

Net production (NP)

B

Secondary production

C

Tertiary production

D

Gross production (GP)

Question 84: Palette 84/87

NEET 2003 MCQ

Which of the following plants are used as green manure in crop fields and in sandy soils ?

A

Calotropis procera and Phyllanthus niruri

B

Dichanthium annulatum and Azolla nilotica

C

Saccharum munja and Lantana camara

D

Crotalaria juncea and Alhagi camelorum

Question 85: Palette 85/87

NEET 2002 MCQ

Bamboo plant is growing in a far forest then what will be the trophic level of it ?

A

Second trophic level (T₂)

B

First trophic level (T₁)

C

Fourth trophic level (T₄)

D

Third trophic level (T₃)

Question 86: Palette 86/87

NEET 2001 MCQ

Plant Decomposers are : -

A

Protista and Animalia

B

Anibalia and Mogna

C

Monera and fungi

D

Fungi and plants

Question 87: Palette 87/87

NEET 2000 MCQ

Which is the reason for highest biomass in aquatic ecosystem ?

A

Benthonic and brown algae

B

Nano plankton, blue green algae, green algae

C

Diatoms

D

Sea grass, and slime molds