Question 1: Palette 1/138

Allen MCQ

Ecosystem term coined by :-

A

Odum

B

Mishra

C

Reiter

D

Tansley

Question 2: Palette 2/138

Allen MCQ

Which one is not a functional aspect of ecosystem?

A

Energy flow

B

Productivity

C

Decomposition

D

Stratification

Question 3: Palette 3/138

Allen MCQ

The minimum energy is stored at which of the following trophic level in any ecosystem

A

Carnivores

B

Herbivores

C

Producers

D

Decomposers

Question 4: Palette 4/138

Allen MCQ

The source of energy in an ecosystem is :-

A

Sunlight

B

DNA

C

ATP

D

RNA

Question 5: Palette 5/138

Allen MCQ

Ecosystem may be defined as :-

A

A localized association of several plants and animals

B

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

C

Different communities of plants and microbes along with their physicochemical environment

D

None of the above

Question 6: Palette 6/138

Allen MCQ

The importance of ecosystem lies in: -

A

Flow of energy

B

Cycling of materials

C

Both the above

D

None of the above

Question 7: Palette 7/138

Allen MCQ

Ecosystem is:-

A

Any functional unit that includes the whole community in a given area interacting with the abiotic factors

B

A group of green plants

C

A group of animals interacting with environment

D

Man and pets living together

Question 8: Palette 8/138

Allen MCQ

Who proposed that ecosystem is symbol of structure & function of nature :-

A

Gardner

B

Odum

C

Tansley

D

Reiter

Question 9: Palette 9/138

Allen MCQ

Largest ecosystem of the world are: -

A

Forests

B

Grass lands

C

Great lakes

D

Oceans

Question 10: Palette 10/138

Allen MCQ

Which of the following is a manmade artificial ecosystem?

A

Grassland ecosystem

B

Forest ecosystem

C

Ecosystem of artificial lakes & dams

D

None of these

Question 11: Palette 11/138

Allen MCQ

Nepenthes (Insectivorous pitcher plant) is:

A

Producer

B

Consumer

C

Both (1) & (2)

D

None of these

Question 12: Palette 12/138

Allen MCQ

Which one is omnivorous?

A

Cow

B

Lion

C

Deer

D

Man

Question 13: Palette 13/138

Allen MCQ

Which biotic components mainly help in recycling of minerals?

A

Producers

B

Consumers

C

Decomposers

D

All the above

Question 14: Palette 14/138

Allen MCQ

Trophic levels are formed by :-

A

Only plants

B

Only carnivores

C

Only animals

D

Organisms linked in food chain

Question 15: Palette 15/138

Allen MCQ

In a forest ecosystem green plants are :-

A

Primary producers

B

Consumers

C

Primary consumers

D

Decomposers

Question 16: Palette 16/138

Allen MCQ

In an ecosystem the function of the producers is to :-

A

Convert organic compounds into inorganic compounds

B

Trap solar energy and convert it into chemical energy

C

Utilize chemical energy

D

Release energy

Question 17: Palette 17/138

Allen MCQ

With regard to ecological food chain, man is a :-

A

Consumer

B

Producer

C

Both consumer & producer

D

Decomposer

Question 18: Palette 18/138

Allen MCQ

A plant, being eaten by a herbivore which in turn is eaten by a carnivore makes :-

A

Food chain

B

Web of Food

C

Omnivores

D

Interdependence

Question 19: Palette 19/138

Allen MCQ

When peacock, eats snake which eats insects depends on green plants, the peacock is?

A

A primary consumer

B

A primary decomposer

C

A final decomposer of plants

D

The apex of the food pyramid

Question 20: Palette 20/138

Allen MCQ

If we completely remove 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 21: Palette 21/138

Allen MCQ

Path of energy flow in an ecosystem is :-

A

Herbivorous → producer →
carnivorous → decomposer

B

Herbivorous → carnivorous →
producer → decomposer

C

Producer → carnivorous →
herbivorous → decomposer

D

Producer → herbivorous →
carnivorous → decomposer

Question 22: Palette 22/138

Allen MCQ

Pyramids of energy are :-

A

Always upright

B

Always Inverted

C

Mostly upright

D

Mostly inverted

Question 23: Palette 23/138

Allen MCQ

The ecological pyramid of numbers in pond ecosystem is :-

A

Upright

B

Inverted

C

May upright or Inverted

D

First upright then inverted

Question 24: Palette 24/138

Allen MCQ

An ecosystem resists change because it is in a state of :-

A

Homoeostasis

B

Regular Illumination

C

Static Imbalance

D

Food accumulation

Question 25: Palette 25/138

Allen MCQ

What is true about any ecosystem?

A

It is self-regulatory

B

It is self-sustained

C

Top carnivores have climax trophic level position

D

All of these above

Question 26: Palette 26/138

Allen MCQ

The Pyramid of numbers in grassland ecosystem will be :-

A

Upright

B

Inverted

C

Irregular

D

Linear

Question 27: Palette 27/138

Allen MCQ

Which ecosystem has maximum number of producers in an unit area?

A

Pond

B

Grassland

C

Forest

D

Tundra

Question 28: Palette 28/138

Allen MCQ

The storage of energy at consumer level is known as :-

A

Gross primary production

B

Secondary productivity

C

Net primary productivity

D

Net productivity

Question 29: Palette 29/138

Allen MCQ

Gross primary productivity is :-

A

Rate at which organic molecules are formed in an autotroph

B

Rate at which organic molecules are used up by an autotroph

C

Storage of organic molecules in the body of an autotroph

D

Rate at which organic molecules are transferred to next higher trophic level

Question 30: Palette 30/138

Allen MCQ

Carbon cycle includes (the following is a logical sequence) :-

A

Producer – consumer – decomposer

B

Decomposer – consumer – producer

C

Producer – decomposer – consumer

D

Consumer – producer – decomposer

Question 31: Palette 31/138

Allen MCQ

The flow of materials from non-living components to living components and back to the non-living components in a more or less cyclic manner is called a :-

A

Gaseous cycle

B

Sedimentary cycle

C

Biogeochemical cycle

D

Hydrologic cycle

Question 32: Palette 32/138

Allen MCQ

A group of interconnected food chains is called:

A

Pyramid of energy

B

Food web

C

Food cycle

D

Complex food chain

Question 33: Palette 33/138

Allen MCQ

Which of these is the food chain which runs from larger to smaller organisms?

A

Grazing food chain

B

Saprotrophic food chain

C

Predatory food chain

D

Parasitic food chain

Question 34: Palette 34/138

Allen MCQ

A food chain starts from: -

A

Nitrogen fixing organisms

B

Photosynthetic organisms

C

Respiration

D

Decomposers

Question 35: Palette 35/138

Allen MCQ

The functional unit of nature is called: -

A

Community

B

Ecosystem

C

Population

D

Succession

Question 36: Palette 36/138

Allen MCQ

Primary productivity of plants in an ecosystem depends on :-

A

A variety of environmental factors

B

Availability of nutrients

C

Photosynthetic capacity of plants

D

All of the above

Question 37: Palette 37/138

Allen MCQ

The annual net primary productivity of land is about :-

A

170 billion tons

B

70 billion tons

C

55 billion tons

D

115 billion tons

Question 38: Palette 38/138

Allen MCQ

Which of the following is included in decomposition?

A

Fragmentation

B

Leaching

C

Catabolism

D

All of the above

Question 39: Palette 39/138

Allen MCQ

Decomposition rate is slow if detritus is rich in :-

A

Nitrogen

B

Humus

C

Sugars

D

Lignin and Chitin

Question 40: Palette 40/138

Allen Match the Columns

Match the Column-I, II and Column-III, and choose the correct combination from the options given :-

Column-III
(a) 1° Producer
(b) 1° Consumer
(c) 2° Consumer
(d) 3° Consumer

A

T₁

B

T₂

C

T₃

D

T₄ (p) Grasshopper (q) Wolf (r) Lion (s)Phytoplankton

Question 41: Palette 41/138

Allen MCQ

A plant receives $10^{6}$ J of sunlight energy. The energy reached at the tertiary consumer will be: -

A

1000 J

B

100 J

C

10 J

D

1 J

Question 42: Palette 42/138

Allen MCQ

An inverted pyramid of biomass can be found in which ecosystem: -

A

Forest

B

Pond

C

Grass land

D

Tundra

Question 43: Palette 43/138

Allen MCQ

In an ecosystem:

A

Primary producers are more than primary consumers

B

Primary consumers are larger than primary producers

C

Secondary consumers are larger than primary producers

D

Primary consumers are least depend on primary producers

Question 44: Palette 44/138

Allen MCQ

Large ecosystems are called -

A

Biomes

B

Ecotone

C

Ecads

D

Biocoenosis

Question 45: Palette 45/138

Allen MCQ

Which one is not a functional aspect of ecosystem?

A

Energy flow

B

Productivity

C

Decomposition

D

Stratification

Question 46: Palette 46/138

Allen MCQ

Vultures in an ecosystem are :

A

Predators

B

Scavangers

C

Consumers

D

Top carnivores

Question 47: Palette 47/138

Allen MCQ

The maximum energy is stored at which of the following trophic level in any ecosystem

A

Producers

B

Herbivores

C

Carnivores

D

Top carnivores

Question 48: Palette 48/138

Allen MCQ

Limiting factor for productivity in lake is :-

A

Phosphorous

B

Nitrogen

C

Carbon

D

Sulphur

Question 49: Palette 49/138

Allen MCQ

In an ecosystem, energy flow is always :-

A

Bidirectional

B

Unidirectional

C

In all directions

D

More than one option is correct

Question 50: Palette 50/138

Allen MCQ

What is formed when a biological community is integrated with its physical environment?

A

Biosphere

B

Biome

C

Ecosystem

D

Population

Question 51: Palette 51/138

Allen MCQ

Based on ecology which is not essential for an ecosystem to self-sustain-

A

Consumers

B

Producers

C

Decomposers (1) Both (1) and (2)

Question 52: Palette 52/138

Allen MCQ

Statement-1 : Death of organism is the beginning of the detritus food chain/web. Statement 2 : Amount of energy decreases at successive trophic levels.

A

Both statement 1 and 2 are incorrect

B

Statement 1 is correct but statement 2 is incorrect

C

Statement 1 is incorrect but statement 2 is correct

D

Both statement 1 and 2 are correct

Question 53: Palette 53/138

Allen MCQ

A pond is a :-

A

Biome

B

Natural ecosystem

C

Artificial ecosystem

D

Community of plants & animals

Question 54: Palette 54/138

Allen MCQ

Which of the following are not given any place in ecological pyramids –

A

Herbivores

B

Carnivores

C

Producers

D

Saprophytes

Question 55: Palette 55/138

Allen MCQ

The bulk of nitrogen in nature is fixed by -

A

Lighting

B

Chemical industries

C

Denitrifying bacteria

D

Symbiotic bacteria

Question 56: Palette 56/138

Allen MCQ

A good soil is that which -

A

holds whole of the water entering into it

B

Allows limited amount of water into it

C

Allows the water to percolate slowly into it

D

Allows the water to pass very quickly from it

Question 57: Palette 57/138

Allen MCQ

The soil near the surface is usually darker then the soil about one meter down. This is because the top soil is

A

Young & wet

B

Richer in organic matter

C

Richer in Ca & Mg

D

Dry

Question 58: Palette 58/138

Allen MCQ

A soil is said to be fertile when -

A

It is rich in organic matter

B

It has capacity to hold water

C

It has a capacity to hold nutrients

D

It holds water & all essential nutrients in a definite proportion

Question 59: Palette 59/138

Allen MCQ

Forests near equator region are called -

A

Deciduous

B

Tropical rain forests

C

Coniferous forests

D

Temperate forests

Question 60: Palette 60/138

Allen MCQ

All the living organisms and non-living factors of the earth constitute -

A

Biosphere

B

Community

C

Biome

D

Association

Question 61: Palette 61/138

Allen MCQ

The term biosphere is used for the zone of the earth where life exists -

A

On the lithospere

B

In the hydrosphere

C

In the lithosphere and hydrosphere

D

In the lithosphere, hydrosphere and atmosphere

Question 62: Palette 62/138

Allen MCQ

A biosphere is composed of

A

Living organisms

B

Living organisms + Lithosphere

C

Living organisms + lithosphere + atmosphere

D

Living organisms + lithosphere + atmosphere + hydrosphere

Question 63: Palette 63/138

Allen MCQ

Which one 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 64: Palette 64/138

Allen MCQ

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

A

Temperate deciduous forest

B

Tropical rain forest

C

Tropical deciduous forest

D

Temperate evergreen forest

Question 65: Palette 65/138

Allen MCQ

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

A

Frog

B

Phytoplankton

C

Fish

D

Zooplankton

Question 66: Palette 66/138

Allen 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 67: Palette 67/138

Allen MCQ

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

A

Standing crop

B

Detritus

C

Humus

D

Standing state

Question 68: Palette 68/138

Allen MCQ

Of the total incident solar radiation, the proportion of PAR is: -

A

About 70%

B

About 60%

C

Less than 50%

D

More than 80%

Question 69: Palette 69/138

Allen MCQ

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

A

Frog

B

Sparrow

C

Lion

D

Goat

Question 70: Palette 70/138

Allen MCQ

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

A

Catabolism

B

Humification

C

Fragmentation

D

Mineralisation BES094

Question 71: Palette 71/138

Allen MCQ

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

A

Productivity

B

Species diversity

C

Energy flow

D

Decomposition

Question 72: Palette 72/138

Allen MCQ

Identify the possible link "A" in the following food chain: - Plant → Insect → Frog → "A" → Eagle

A

Cobra

B

Parrot

C

Rabbit

D

Wolf

Question 73: Palette 73/138

Allen MCQ

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

A

Decomposer

B

Producer

C

Parasite

D

Consumer

Question 74: Palette 74/138

Allen MCQ

Which one of the following is functional characteristics of ecosystem?

A

Stratification

B

Productivity

C

Species dominancy

D

Species diversity

Question 75: Palette 75/138

Allen MCQ

In an ecosystem :-

A

Primary producers are more than primary consumers.

B

Primary consumers are always larger than primary producers.

C

Secondary consumers are always larger than primary producers.

D

Primary consumers are least depend on primary producers.

Question 76: Palette 76/138

Allen MCQ

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

(a) Rock minerals
(b) Detritus
(c) Litter fall
(d) Producers

A

Rock minerals

B

Litter fall

C

Producers

D

Detritus

Question 77: Palette 77/138

Allen 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

0.02 J

B

0.002 J

C

0.2 J

D

0.0002 J

Question 78: Palette 78/138

Allen MCQ

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

A

Standing state

B

Net primary productivity

C

Standing crop

D

Gross primary productivity

Question 79: Palette 79/138

Allen MCQ

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

A

Gross primary productivity

B

Secondary productivity

C

Net productivity

D

Net primary productivity

Question 80: Palette 80/138

Allen MCQ

Secondary Succession takes place on/in :-

A

Degraded forest

B

Newly created pond

C

Newly cooled lava

D

Bare rock

Question 81: Palette 81/138

Allen MCQ

In which of the following both pairs have corrected combination?

A

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

B

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

C

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

D

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

Question 82: Palette 82/138

Allen MCQ

During ecological succession :-

A

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

B

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

C

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

D

The numbers and types of animals remain constant

Question 83: Palette 83/138

Allen MCQ

The term ecosystem was coined by :-

A

E. P. Odum

B

A. G. Tansley

C

E. Haeckel

D

E. Warming

Question 84: Palette 84/138

Allen MCQ

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

A

Blue-green algae

B

Coral reefs

C

Green algae

D

Chemosynthetic bacteria

Question 85: Palette 85/138

Allen MCQ

Which ecosystem has the maximum biomass?

A

Grassland ecosystem

B

Pond ecosystem

C

Lake ecosystem

D

Forest ecosystem

Question 86: Palette 86/138

Allen MCQ

The sequential events from initial stage till climax stage in a succession are called :-

A

Ecesis

B

Sere

C

Nudation

D

Migration

Question 87: Palette 87/138

Allen 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 88: Palette 88/138

Allen MCQ

Which of the following statements is incorrect?

A

Biomass decreases from first to fourth trophic level

B

Energy content gradually increases from first to fourth trophic level

C

Number of individuals decreases from first trophic level to fourth trophic level

D

Energy content gradually decreases from first to fourth trophic level

Question 89: Palette 89/138

Allen MCQ

The rate decomposition is faster in the ecosystem due to following factors EXCEPT

A

Detritus rich in sugars

B

Warm and moist environment

C

Presence of aerobic soil microbes

D

Detritus richer in lignin and chitin

Question 90: Palette 90/138

Allen MCQ

In relation of 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 91: Palette 91/138

Allen MCQ

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

A

Climax

B

Climax community

C

Standing state (4) Standing crop

Question 92: Palette 92/138

Allen MCQ

Which of the following statements is not correct?

A

Pyramid of biomass in sea is generally inverted.

B

Pyramid of biomass in sea is generally upright.

C

Pyramid of energy is always upright.

D

Pyramid of numbers in a grassland ecosystem is upright.

Question 93: Palette 93/138

Allen MCQ

Assertion (A): A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations. Reason (R): Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen. In the light of the above statements, choose the correct answer from the options given below.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true but (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Question 94: Palette 94/138

Allen MCQ

In the equation GPP - R = NPPR represents :-

A

Radiant energy

B

Retardation factor

C

Environment factor

D

Respiration losses

Question 95: Palette 95/138

Allen MCQ

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

A

Secondary production

B

Primary production

C

Gross primary production

D

Net primary production

Question 96: Palette 96/138

Allen MCQ

Which one of the following will accelerate phosphorus cycle?

A

Volcanic activity

B

Weathering of rocks

C

Rain fall and storms

D

Burning of fossil fuels

Question 97: Palette 97/138

Allen Match the Columns

Match the column-I with column-II

Column-I	Column-II
(a) Carbon dissolved in oceans (b) Annual fixation of carbon through photosynthesis (c) PAR captured by plants (d) Productivity of oceans	(i) 55 billion tons (ii) 71% (iii) 4 × 10¹³ kg (iv) 2 to 10%

A

(a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)

B

(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)

C

(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)

D

(a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)

Question 98: Palette 98/138

Allen 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 99: Palette 99/138

Allen 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 100: Palette 100/138

Allen 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 101: Palette 101/138

Allen MCQ

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : A person goes to high altitude and experiences "Altitude Sickness" with symptoms like breathing difficulty and heart palpitations.
Reason (R) : Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.
In the light of the above statements,
choose the correct answer from the options given below :

A

(A) is true but (R) is false

B

(A) is false but (R) is true

C

Both (A) and (R) are true and (R) is the correct explanation of (A).

D

Both (A) and (R) are true but (R) is not the correct explanation of (A).

Question 102: Palette 102/138

Allen MCQ

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

A

$\frac{X}{10} (kcalm^{-2})yr^{-1}$

B

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

C

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

D

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

Question 103: Palette 103/138

Allen MCQ

Consider the pyramid of energy of an ecosystem given below: If $T_{4}$ is equivalent to 1000J, what is the value at $T_{1}$ .

A

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

B

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

C

10,000 J

D

10,00,000 J

Question 104: Palette 104/138

Allen MCQ

Adaptation to low temperature and freezing in animals occurs due to the production of :-

A

Antifreeze proteins

B

Chaperonins

C

Proline

D

Analine

Question 105: Palette 105/138

Allen MCQ

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

A

Producers

B

Primary consumers

C

Secondary consumers

D

Decomposers

Question 106: Palette 106/138

Allen MCQ

The second trophic level in a lake is :-

A

Phytoplankons

B

Zooplanktons

C

Benthos

D

Fishes

Question 107: Palette 107/138

Allen MCQ

Secondary producers are :-

A

Herbivores

B

Producers

C

Carnivores

D

None of the above

Question 108: Palette 108/138

Allen MCQ

What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiations?

A

100 %

B

50 %

C

1–5 %

D

2 – 10 %

Question 109: Palette 109/138

Allen MCQ

Which of the following is an abiotic components of the ecosystem?

A

Bacteria

B

Humus

C

Plants

D

Fungi

Question 110: Palette 110/138

Allen MCQ

Which of the following processes helps in Nutrient conservation?

A

Mineralisation

B

Immobilisation

C

Leaching

D

Nitrification

Question 111: Palette 111/138

Allen MCQ

Which of the following represents the sedimentary type of nutrient cycle?

A

Sulphur

B

Phosphorus

C

Nitrogen

D

Oxygen

Question 112: Palette 112/138

Allen MCQ

Photosynthetically active radiation (PAR) represents the following range of wave length.

A

400 – 700 nm

B

500 – 600 nm

C

450 – 950 nm

D

340 – 450 nm

Question 113: Palette 113/138

Allen MCQ

The detritus food chain (DFC) begins with :

A

Producers

B

Grasses

C

Dead organic matter

D

Humus

Question 114: Palette 114/138

Allen MCQ

Rate of capture of solar energy or total production of organic matter is called as-

A

Gross primary productivity

B

Gross secondary productivity

C

Net primary productivity

D

Secondary productivity

Question 115: Palette 115/138

Allen MCQ

A sparrow is a ____ consumer when it eats seeds, fruits, peas, and a ____ consumer when it eats insects and worms.

A

Secondary, Primary

B

Primary, Secondary

C

Tertiary, Secondar

D

Primary, Tertiary

Question 116: Palette 116/138

Allen MCQ

Total amount of energy trapped by green plants in food is called :-

A

Gross primary production

B

Net primary production

C

Standing crop

D

Standing state

Question 117: Palette 117/138

Allen MCQ

Bacteria are essential in carbon cycle as :-

A

Decomposer

B

Synthesizer

C

Consumer

D

Pri. Producer

Question 118: Palette 118/138

Allen MCQ

In which biome a new plant may adapt soon:-

A

Tropical rain forest

B

Desert

C

Mangrove

D

Sea island

Question 119: Palette 119/138

Allen MCQ

Concentration of DDT is highest in :-

A

Primary consumer

B

Producers

C

Top consumer

D

Decomposers

Question 120: Palette 120/138

Allen MCQ

Percentage energy transferred to higher trophic level in food chain is :-

A

1%

B

10%

C

90%

D

100%

Question 121: Palette 121/138

Allen MCQ

Biotic and abiotic components form :-

A

Community

B

Ecosystem

C

Population

D

Species

Question 122: Palette 122/138

Allen MCQ

Species diversity is maximum in :-

A

Tropical rain forest

B

Temperate forest

C

Deserts

D

Hill slops

Question 123: Palette 123/138

Allen MCQ

Insectivorous plants grow in the soil which is deficient in :-

A

Mg

B

Ca

C

P

D

N

Question 124: Palette 124/138

Allen MCQ

Which is the reason for highest biomass in aquatic ecosystem-

A

Nano plankton, blue green algae, green algae

B

Sea grass, and slime molds

C

Benthonic and brown algae

D

Diatoms

Question 125: Palette 125/138

Allen MCQ

Pneumatophores are found in-

A

The vegetation which is found in marshy and saline lake

B

The vegetation which found in saline soil

C

Xerophytes

D

Epiphytes

Question 126: Palette 126/138

Allen MCQ

In which of the following plant sunken stomata are found :-

A

Nerium

B

Hydrilla

C

Mango

D

Guava

Question 127: Palette 127/138

Allen MCQ

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

A

High stability and low resilience

B

Low stability and low resilience

C

High stability and high resilience

D

Low stability and high resilience

Question 128: Palette 128/138

Allen MCQ

In which one of the following habitats does the diurnal temperature of soil surface vary most?

A

Forest

B

Desert

C

Grassland

D

Shrub land

Question 129: Palette 129/138

Allen MCQ

Which of the following is not true for a species?

A

Members of a species can interbreed

B

Gene flow does not occur between the populations of a species

C

Each species is reproductively isolated from every other species

D

Variations occur among members of a species

Question 130: Palette 130/138

Allen 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 131: Palette 131/138

Allen MCQ

Consider the following statements concerning food chains :-
(a) Removal of 80% tigers from an 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 very from 2 to 8 trophic levels.
Which two of the above statements are correct?

A

a, d

B

a, b

C

b, c

D

c, d

Question 132: Palette 132/138

Allen MCQ

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

A

A

B

B

C

C

D

D

Question 133: Palette 133/138

Allen MCQ

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

A

Its base is broad

B

It shows energy content of different trophic level organisms

C

It is inverted in shape

D

It is upright in shape

Question 134: Palette 134/138

Allen MCQ

The upright pyramid of number is absent in

A

Lake

B

Grassland

C

Pond

D

Forest

Question 135: Palette 135/138

Allen 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 one PP is "Pipal trees" and the level SC is "sheep"

B

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

C

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

D

Level PP is "Phytoplanktons" in sea and "Whale" on top level TC.

Question 136: Palette 136/138

Allen MCQ

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

A

rat, dog, tortoise, crow

B

squirrel, cat, rat, pigeon

C

deer, rabbit, frog, rat

D

dog, squirrel, bat, deer

Question 137: Palette 137/138

Allen MCQ

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

A

Net primary productivity

B

Gross primary productivity

C

Net productivity

D

Secondary productivity

Question 138: Palette 138/138

Allen MCQ

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

A

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

B

Fragmentation — Carried out by organisms such as earthworm

C

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

D

Catabolism — Last step in the decomposition under fully anaerobic condition