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NEET • BIOLOGY • ECO SYSTEM

Eco system practice · Mixed difficulty

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Showing 1-30 of 238 questions

1 Hard

1 of 238

Understanding +4 | -1

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

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Correct option: A

It occurs on a deforested site

Option A (It occurs on a deforested site) is correct because secondary succession occurs in areas where previous life existed, such as a deforested site.

2 Medium

2 of 238

Analyzing +4 | -1

Find odd one out w.r.t. key functional aspects of the ecosystem.

View answer and explanation

Correct option: D

Species composition

Option D (Species composition) is correct because nutrient cycling, energy flow, and decomposition are key functional aspects of an ecosystem, while species composition is a characteristic, not a process.

3 Easy

3 of 238

Remembering +4 | -1

The reservoir for the gaseous type of biogeochemical cycle exists in

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Correct option: B

Atmosphere

Option B (Atmosphere) is correct because the atmosphere serves as the primary reservoir for gaseous biogeochemical cycles.

4 Medium

4 of 238

Remembering +4 | -1

Regarding 10% law
I. This law was put forward by Lindeman in 1942
II. According to this law, during the transfer of food energy from one tropical level to the other, only about 10% is stored at higher trophic level and the remaining 90% is lost in respiration, decomposition and waste in the form of heat
Which of the statements given above is/are correct?

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Correct option: C

I and II

Option C (I and II) is correct because both statements accurately describe Lindeman's 10% law regarding energy transfer between trophic levels.

5 Easy

5 of 238

Remembering +4 | -1

Standing crop refers to

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Correct option: C

The amount of living matter in a component population of an ecosystem at any time

Option C (The amount of living matter in a component population of an ecosystem at any time) is correct because standing crop refers to the biomass of a specific population at a given time.

6 Hard

6 of 238

Understanding +4 | -1

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

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Correct option: C

Mesic

Option C (Mesic) is correct because all successions tend to lead to a mesic climax community, which represents a balanced moisture condition.

7 Easy

7 of 238

Remembering +4 | -1

Total energy fixed by an ecosystem is called

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Correct option: B

Gross production

Option B (Gross production) is correct because the total energy fixed by an ecosystem is called gross production, which includes all energy captured by producers.

8 Medium

8 of 238

Understanding +4 | -1

Which of the following plants develop characters of xerophytes?

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Correct option: D

Halophytes

Option D (Halophytes) is correct because halophytes are plants adapted to saline environments, exhibiting xerophytic characteristics to conserve water.

9 Easy

9 of 238

Understanding +4 | -1

Primary productivity is affected by
I. temperature
II. sunlight
III. moisture
IV. availability of nutrients

View answer and explanation

Correct option: D

I, II, III and IV

Option D (I, II, III and IV) is correct because temperature, sunlight, moisture, and nutrient availability all significantly influence primary productivity.

10 Easy

10 of 238

Remembering +4 | -1

In a pond ecosystem, benthos means

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Correct option: A

Primary consumers in the depth of a pond

Option A is correct because benthos refers to the organisms living on or in the bottom sediment of a body of water, including primary consumers.

11 Medium

11 of 238

Understanding +4 | -1

Series of changes in structure and comparition of communities on previously barren area is

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Correct option: C

Primary succession

The correct answer is C (Primary succession) because primary succession is the ecological succession that begins in new environments, such as bare rock or a newly formed volcanic island.

12 Hard

12 of 238

Understanding +4 | -1

Biomagnification will be maximum among which of the given trophic level in an aquatic ecosystem?

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Correct option: D

T_4

Option D (

T_4

) is correct because biomagnification increases with each trophic level, so the highest trophic level will have the maximum concentration.

13 Hard

13 of 238

Application +4 | -1

A pasture of 40 hectares has a biomass of 40 kg/hectare, or roughly

1,000,000

calories of energy. Cattle grazing on this pasture are sold for beef. About how many calories of energy from the pasture reach human consumers of the beef?

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Correct option: A

10000

Option A (10000) is correct because only about 1% of the energy from the pasture reaches human consumers due to energy loss at each trophic level.

14 Easy

14 of 238

Analyzing +4 | -1

Which type of ecological pyramid would be obtained with the following data -
Secondary Consumer - 2500 Joule
Primary Consumer - 4500 Joule
Primary Producer - 5000 Joule
Tertiary Consumer - 1000 Joule

View answer and explanation

Correct option: D

This pyramid is not possible.

Option D (This pyramid is not possible) is correct because energy must decrease at each higher trophic level, but here the primary consumer has less energy than the primary producer.

15 Medium

15 of 238

Remembering +4 | -1

The transition zone between two communities is known as

View answer and explanation

Correct option: A

Ecotone

Option A (Ecotone) is correct because an ecotone is defined as the transition zone between two different communities.

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16 Medium

16 of 238

Understanding +4 | -1

The role of a cow in a food chain is

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because a cow is a primary consumer, a heterotroph, and an herbivore.

17 Medium

17 of 238

Understanding +4 | -1

The process of mineralisation by microorganisms helps in the release of

View answer and explanation

Correct option: A

Inorganic nutrients from humus

Option A is correct because mineralization is the process by which microorganisms break down organic matter in humus, releasing inorganic nutrients.

18 Hard

18 of 238

Remembering +4 | -1

The transfer of energy from one trophic level to another is governed by the 2nd law of thermodynamics. The average efficiency of energy transfer from herbivores to carnivores is

View answer and explanation

Correct option: B

0.1

Option B (0.1) is correct because, on average, only about 10% (or 0.1) of the energy is transferred from one trophic level to the next.

19 Medium

19 of 238

Analyzing +4 | -1

Pick out the odd one –

View answer and explanation

Correct option: B

Phosphorus cycle

Option B (Phosphorus cycle) is correct because the phosphorus cycle is primarily sedimentary, while the others are gaseous.

20 Medium

20 of 238

Remembering +4 | -1

The carbon is fixed annually in the biosphere through photosynthesis is?

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Correct option: A

4 \times {10^{13}}kg

Option A (

4 \times {10^{13}}kg

) is correct because this is the approximate amount of carbon fixed annually through photosynthesis in the biosphere.

21 Medium

21 of 238

Remembering +4 | -1

Climax community is

View answer and explanation

Correct option: D

All of these

Option D is correct because a climax community is stable, self-perpetuating, and represents the final biotic community in ecological succession.

22 Easy

22 of 238

Understanding +4 | -1

In which of the following, root system is poorly developed?

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Correct option: B

Hydrilla

Option B (Hydrilla) is correct because Hydrilla is a submerged aquatic plant and has a poorly developed root system as it absorbs nutrients directly from the water.

23 Medium

23 of 238

Remembering +4 | -1

The movement of nutrient elements through various components (abiotic and biotic) of an ecosystem is called

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Correct option: C

Biogeochemical cycle

Option C (Biogeochemical cycle) is correct because it encompasses the movement of nutrient elements through both abiotic and biotic components of an ecosystem.

24 Easy

24 of 238

Remembering +4 | -1

The living organisms present in an ecosystem forms

View answer and explanation

Correct option: B

Biotic components

Option B is correct because living organisms in an ecosystem form the biotic components.

25 Medium

25 of 238

Understanding +4 | -1

What is true about the phosphorus cycle?
I. Rocks are the natural reservoirs of phosphorus
II. Weathering of sedimentary rocks makes phosphate available to the soil
III. Herbivores and carnivores obtain phosphorus from plant directly or indirectly
Choose the correct option

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Correct option: D

I, II and III

Option D (I, II and III) is correct because all three statements accurately describe aspects of the phosphorus cycle.

26 Medium

26 of 238

Application +4 | -1

What type of ecological pyramid would be obtained with the following data:
Secondary consumer:

10 \mathrm{~g}

Primary consumer:

60 \mathrm{~g}

Primary producer:

120 \mathrm{~g}

View answer and explanation

Correct option: D

Upright pyramid of biomass

Option D (Upright pyramid of biomass) is correct because the biomass decreases at each higher trophic level (120g -> 60g -> 10g).

27 Easy

27 of 238

Understanding +4 | -1

The enzymatic process by which degraded detritus is converted into simpler inorganic substances is called

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Correct option: A

Catabolism

Option C (Mineralisation) is correct because mineralisation is the process by which decomposers convert organic matter into inorganic substances.

28 Easy

28 of 238

Remembering +4 | -1

Ecosystem consists of

View answer and explanation

Correct option: D

All of these

Option D is correct because an ecosystem consists of producers, consumers, and decomposers, which are all essential for the flow of energy and nutrients.

29 Easy

29 of 238

Remembering +4 | -1

Which ones are the reservoirs of sulphur and carbon cycles respectively?

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Correct option: B

Earth crust and atmosphere

Option B (Earth crust and atmosphere) is correct because sulfur's main reservoir is the Earth's crust, and carbon's is the atmosphere (as CO2).

30 Medium

30 of 238

Understanding +4 | -1

The nature of climax community in ecological succession in most dependent upon

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Correct option: A

Climate

Option A (Climate) is correct because climate, including temperature and rainfall, is the most significant factor determining the climax community.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 238 single-correct-answer MCQs on ECO SYSTEM.
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