Class XII · Biology practice
Ecosystem PYQs Check your understanding, bookmark questions and revisit your mistakes.
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19 questions in this collection · Page 1 of 2
Ecosystem
Identify the correct statements:
A D, E, A only B A, B, C only C B, C, D only D C, D, E only
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Ecosystem
In the equation GPP – R = NPP
A Reproductive allocation B Photosynthetically active radiation C Respiratory quotient D Respiratory loss
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Ecosystem
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.
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
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Ecosystem
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
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Ecosystem
Detritivores breakdown detritus into smaller
particles. This process is called:
A Fragmentation B Humification C Decomposition D Catabolism
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Ecosystem
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 D Standing crop
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Ecosystem
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.
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Ecosystem
In the equation GPP–R = NPP.
A Radiant energy B Retardation factor C Environment factor D Respiration losses
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Ecosystem
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
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)
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Ecosystem
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.
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