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NEET • BIOLOGY • ECO SYSTEM

Eco system practice · Medium

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Showing 1-30 of 111 questions

1 Medium

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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.

2 Medium

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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.

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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.

4 Medium

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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.

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Remembering +4 | -1

The transition zone between two communities is known as

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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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Understanding +4 | -1

The role of a cow in a food chain is

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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.

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Understanding +4 | -1

The process of mineralisation by microorganisms helps in the release of

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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.

8 Medium

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Analyzing +4 | -1

Pick out the odd one –

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Correct option: B

Phosphorus cycle

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

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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.

10 Medium

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Remembering +4 | -1

Climax community is

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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.

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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.

12 Medium

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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.

13 Medium

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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).

14 Medium

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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.

15 Medium

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Analyzing +4 | -1

Assertion: Phosphorus cycle does not involve microorganisms.
Reason: Microorganisms are mainly associated with nitrogen cycle.

View answer and explanation

Correct option: B

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

Option B is correct because both the assertion and the reason are true, but the reason doesn't explain the assertion. While microorganisms are heavily involved in the nitrogen cycle, they also play a role in the phosphorus cycle.

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Understanding +4 | -1

Aerenchyma is helpful in plants by

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Correct option: A

Providing buoyancy in hydrophytes

Option A (Providing buoyancy in hydrophytes) is correct because aerenchyma tissue contains large air spaces, which help aquatic plants float.

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Remembering +4 | -1

In xerarch succession the pioneer species is?

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Correct option: A

Lichens

Option A is correct because lichens are the pioneer species in xerarch succession, capable of colonizing bare rock.

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Application +4 | -1

The NPP in a plant is 100Kj. What is the body mass of the secondary carnivore?

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Correct option: D

0.1 Kj

Option D (0.1 Kj) is correct because energy transfer between trophic levels is approximately 10%, so the secondary carnivore would have 0.1 Kj.

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Understanding +4 | -1

Which of the following ecological pyramids can never occur in an inverted from

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Correct option: C

Pyramid of energy

Option C (Pyramid of energy) is correct because the pyramid of energy is always upright due to the laws of thermodynamics and the loss of energy as heat at each trophic level.

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Analyzing +4 | -1

Assertion: In terrestrial ecosystem, a large amount of energy passes through detritus food chain.

Reason: Energy for detritus food chain comes from sun.

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Correct option: C

If the assertion is true but the reason is false

Option C is correct. The assertion is true, as a large amount of energy flows through the detritus food chain in terrestrial ecosystems. However, the reason is false, as the energy source is detritus, not the sun directly.

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Understanding +4 | -1

Autotrophs

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because autotrophs make their own food, are the base of the food chain, and are primary producers.

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Remembering +4 | -1

Father of ecology in India?

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Correct option: B

Ramdeo misra

Option B is correct because Ramdeo Misra is widely recognized as the father of ecology in India for his significant contributions to the field.

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Understanding +4 | -1

In comparative study of grasslands and pond ecosystem

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Correct option: C

Biotic and abiotic components are different

The correct answer is C (Biotic and abiotic components are different) because grasslands and pond ecosystems have distinct living organisms and non-living environmental factors.

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Remembering +4 | -1

Trophic level of food chain having greatest amount of energy, is

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Correct option: C

Autotrophs

Option C (Autotrophs) have the greatest amount of energy in a food chain because they are the primary producers and capture energy directly from sunlight.

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Understanding +4 | -1

True/False I. The total organic matter synthesised by the producers in the process of photosynthesis per unit time and area is known as gross primary productivity II. Net primary productivity is the weight of the organic matter stored by the producers in a unit area/volume per unit time

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Correct option: B

II is true, while I is false

Option A (I is true while II is false) is incorrect. Option B (II is true, while I is false) is correct because the definitions of GPP and NPP are reversed in the statements.

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Analyzing +4 | -1

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

\mathrm{120}\,\,\mathrm{g}

Primary consumer:

\mathrm{60}\,\,\mathrm{g}

Primary producer:

\mathrm{10}\,\,\mathrm{g}

View answer and explanation

Correct option: B

Inverted pyramid of biomass

Option B (Inverted pyramid of biomass) is correct because the biomass of primary producers is less than that of primary and secondary consumers.

27 Medium

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Understanding +4 | -1

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

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Correct option: C

Gross production (GP)

Option C (Gross production (GP)) is correct because gross production represents the total energy captured by producers before any losses due to respiration or other metabolic processes.

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Understanding +4 | -1

Consider the following statements
I. Producer are also called as transducers because they are able to change radiant energy into chemical form
II. Consumers are animals, which feed on other organisms or their parts
III. Decomposers are saprotrophs, which feed on dead bodies of organisms
Which of the statements given above are correct?

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Correct option: A

I, II and III

Option A (I, II and III) is correct because all three statements accurately describe the roles of producers, consumers, and decomposers in an ecosystem.

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Remembering +4 | -1

Driving force of any ecosystem is

View answer and explanation

Correct option: C

Solar energy

Option C (Solar energy) is correct because solar energy is the primary source of energy for almost all ecosystems.

30 Medium

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Remembering +4 | -1

Sunken stomata are usually found in the leaves of

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Correct option: A

Xerophytes

Option A is correct because xerophytes, which live in dry environments, have sunken stomata to reduce water loss.

Revision notes and key takeaways

Review ECO SYSTEM in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 111 single-correct-answer MCQs on ECO SYSTEM.
✓ Try each question before opening its answer. Read the explanation where one is available.
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