Class XI & XII · Biology practice
Zoology PYQs Check your understanding, bookmark questions and revisit your mistakes.
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407 questions in this collection · Page 24 of 41
Organisms And Populations
Secondary metabolites such as nicotine, strychnine
and caffeine are produced by plants for their:
A Nutritive value B Growth response C Defence action D Effect on reproduction
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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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Ecosystem
The rate of 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
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Ecosystem
Which of the following statements is incorrect regarding the phosphorus cycle?
A Phosphates are the major form of phosphorus
reservoir B Phosphorus solubilising bacteria facilitate the release of phosphorus from organic remains C There is appreciable respiratory release of
phosphorus into atmosphere D It is sedimentary cycle
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Biodiversity And Conservation
In the following in each set a conservation approach and an example of method of conservation are given:
A (A) and (C) B (A) and (D) C (B) and (D) D (A) and (B)
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Biodiversity And Conservation
Which of the following regions of the globe exhibits highest species diversity?
A Western Ghats of India B Madagascar C Himalayas D Amazon forests
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Environmental Issues
Air (Prevention and Control of Pollution) Act was
amended in 1987 to include among pollutants:
A Vehicular exhaust B Allergy causing pollen C Noise D Particulates of size 2.5 micrometer or below
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Environmental Issues
Which of the following is put into Anaerobic sludge
digester for further sewage treatment?
A Primary sludge B Floating debris C Effluents of primary treatment D Activated sludge
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Environmental Issues
Montreal protocol was signed in 1987 for control
of:
A Transport of Genetically modified organisms from one country to another B Emission of ozone depleting substances C Release of Green House gases D Disposal of e-wastes
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