NEET Ecosystem PYQ practice sheet

15 previous-year NEET Botany questions from Ecosystem, newest papers first. Ecosystem carries 19 of the Botany questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

Practise all 15 online

1.
RE-NEET 2026
Which of the following are primary consumers in a food chain?
- (A)
  Predators
- (B)
  Parasites
- (C)
  Carnivores
- (D)
  Herbivores
2.
RE-NEET 2026
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)
  (a) and (b) only
- (B)
  (a) and (c) only
- (C)
  (b) and (c) only
- (D)
  (a), (b) and (c)
3.
NEET 2026
Match List I with List II: List I: A. Productivity, B. Net primary productivity, C. Gross primary productivity, D. Secondary productivity List II: I. Gross primary productivity minus respiration losses, II. Rate of formation of new organic matter by consumers, III. Rate of biomass production, IV. Rate of production of organic matter during photosynthesis Choose the correct answer from the options given below:
- (A)
  A-I, B-II, C-III, D-IV
- (B)
  A-III, B-I, C-II, D-IV
- (C)
  A-III, B-I, C-IV, D-II
- (D)
  A-I, B-III, C-IV, D-II
4.
NEET 2026
Match List I with List II: List-I: A. Decomposition, B. Detritus, C. Mineralisation, D. Humification List-II: I. Accumulation of dark coloured amorphous colloidal substance, II. Release of inorganic nutrients by the activity of microbes in soil, III. Breaking down of complex organic matter into inorganic substances, 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-III, B-II, C-I, D-IV
- (D)
  A-I, B-II, C-III, D-IV
5.
NEET 2026
Ecological pyramids represent the relationship between the organisms at different trophic levels and they are generally inverted for:
- (A)
  Pyramid of biomass in grassland
- (B)
  Pyramid of number in grassland
- (C)
  Pyramid of biomass in sea
- (D)
  Pyramid of energy in pond ecosystem
6.
NEET 2024
In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is $100x\ (\mathrm{kcal\,m^{-2}})\,\mathrm{yr^{-1}}$ , what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
- (A)
  $10x\ (\mathrm{kcal\,m^{-2}})\,\mathrm{yr^{-1}}$
- (B)
  $x\ (\mathrm{kcal\,m^{-2}})\,\mathrm{yr^{-1}}$
- (C)
  $\dfrac{100x}{3x}\ (\mathrm{kcal\,m^{-2}})\,\mathrm{yr^{-1}}$
- (D)
  $\dfrac{x}{10}\ (\mathrm{kcal\,m^{-2}})\,\mathrm{yr^{-1}}$
7.
NEET 2023
In the equation
$\mathrm{GPP - R = NPP}$
GPP is Gross Primary Productivity, NPP is Net Primary Productivity. R here is ________.
- (A)
  Reproductive allocation
- (B)
  Photosynthetically active radiation
- (C)
  Respiratory quotient
- (D)
  Respiratory loss
8.
NEET 2023
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)
  D, E, A only
- (B)
  A, B, C only
- (C)
  B, C, D only
- (D)
  C, D, E only
9.
NEET 2022
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)
  Statement I is incorrect but Statement II is correct
- (B)
  Both Statement I and Statement II are correct
- (C)
  Both Statement I and Statement II are incorrect
- (D)
  Statement I is correct but Statement II is incorrect
10.
NEET 2022
Which one of the following will accelerate phosphorus cycle?
- (A)
  Rain fall and storms
- (B)
  Burning of fossil fuels
- (C)
  Volcanic activity
- (D)
  Weathering of rocks
11.
NEET 2021
Which of the following statements is not correct ?
- (A)
  Pyramid of biomass in sea is generally inverted.
- (B)
  Pyramid of energy is always upright.
- (C)
  Pyramid of biomass in sea is generally upright.
- (D)
  Pyramid of numbers in a grassland ecosystem is upright.
12.
NEET 2021
In the equation $GPP - R = NPP$ , $R$ represents :
- (A)
  Retardation factor
- (B)
  Respiration losses
- (C)
  Environment factor
- (D)
  Radiant energy
13.
NEET 2021
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)
  Standing state
- (C)
  Climax community
- (D)
  Climax
14.
NEET 2020
Match the trophic levels with their correct species examples in grassland ecosystem. Select the correct option.
- (A)
  (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
- (B)
  (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
- (C)
  (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
- (D)
  (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
15.
NEET 2020
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
- (A)
  Gross primary productivity is always less than net primary productivity.
- (B)
  Gross primary productivity is always more than net primary productivity.
- (C)
  Gross primary productivity and Net primary productivity are one and same.
- (D)
  There is no relationship between Gross primary productivity and Net primary productivity.

Answer key

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