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Question (31)

QN008844

Which scientist from India is associated with important contributions to understanding environmental systems and sustainability-related nutrient cycles?

(A) C. V. Raman
(B) M. S. Swaminathan
(C) Jagadish Chandra Bose
(D) Homi Bhabha

Correct Answer: B

Explanation:

M. S. Swaminathan promoted sustainable agricultural practices.

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Question (32)

QN008845

A food chain contains 240 kg of plant biomass. If 10% of this biomass is transferred to herbivores, herbivore biomass will be approximately:

(A) 24 kg
(B) 120 kg
(C) 216 kg
(D) 240 kg

Correct Answer: A

Explanation:

10% of 240 kg = 24 kg.

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Question (33)

QN008846

Which statement best defines denitrification?

(A) Conversion of ammonia to nitrites
(B) Conversion of atmospheric nitrogen into nitrates
(C) Conversion of nitrates into nitrogen gas
(D) Conversion of proteins into amino acids

Correct Answer: C

Explanation:

Denitrification returns nitrogen to the atmosphere.

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Question (34)

QN008847

If a water tank contains 8000 L and loses 12% through evaporation, the amount evaporated is:

(A) 96 L
(B) 480 L
(C) 960 L
(D) 1200 L

Correct Answer: C

Explanation:

12% of 8000 = 960 L.

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Question (35)

QN008848

Which cycle directly links photosynthesis and respiration?

(A) Nitrogen cycle
(B) Carbon cycle
(C) Water cycle
(D) Phosphorus cycle

Correct Answer: B

Explanation:

Carbon moves between organisms and atmosphere through these processes.

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Question (36)

QN008849

What would most likely happen if decomposers disappeared from an ecosystem?

(A) Nutrient recycling would slow drastically
(B) Photosynthesis would stop immediately
(C) Nitrogen would vanish from the atmosphere
(D) Oceans would evaporate

Correct Answer: A

Explanation:

Decomposers are essential for nutrient recycling.

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Question (37)

QN008850

A region receives 120 cm rainfall annually. If 25% becomes runoff, the runoff amount is:

(A) 15 cm
(B) 25 cm
(C) 30 cm
(D) 45 cm

Correct Answer: C

Explanation:

25% of 120 cm = 30 cm.

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Question (38)

QN008851

Which of the following best demonstrates the interconnection of biogeochemical cycles?

(A) Plants use water and carbon dioxide during photosynthesis
(B) Rocks remain unchanged for years
(C) Mountains block winds
(D) Soil colour changes seasonally

Correct Answer: A

Explanation:

Photosynthesis links the water and carbon cycles.

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Question (39)

QN008852

The Haber–Bosch process is important because it:

(A) Produces oxygen from water
(B) Fixes atmospheric nitrogen industrially
(C) Removes carbon dioxide from air
(D) Produces ozone

Correct Answer: B

Explanation:

It converts atmospheric nitrogen into ammonia.

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Question (40)

QN008853

Biogeochemical cycles are essential for life because they ensure the:

(A) Continuous recycling of matter in ecosystems
(B) Continuous creation of new elements
(C) Permanent storage of nutrients in rocks
(D) Elimination of all waste materials

Correct Answer: A

Explanation:

Biogeochemical cycles recycle essential matter needed by living organisms.

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Question (31)

Which scientist from India is associated with important contributions to understanding environmental systems and sustainability-related nutrient cycles?

Explanation:

Link:

Question (32)

A food chain contains 240 kg of plant biomass. If 10% of this biomass is transferred to herbivores, herbivore biomass will be approximately:

Explanation:

Link:

Question (33)

Which statement best defines denitrification?

Explanation:

Link:

Question (34)

If a water tank contains 8000 L and loses 12% through evaporation, the amount evaporated is:

Explanation:

Link:

Question (35)

Which cycle directly links photosynthesis and respiration?

Explanation:

Link:

Question (36)

What would most likely happen if decomposers disappeared from an ecosystem?

Explanation:

Link:

Question (37)

A region receives 120 cm rainfall annually. If 25% becomes runoff, the runoff amount is:

Explanation:

Link:

Question (38)

Which of the following best demonstrates the interconnection of biogeochemical cycles?

Explanation:

Link:

Question (39)

The Haber–Bosch process is important because it:

Explanation:

Link:

Question (40)

Biogeochemical cycles are essential for life because they ensure the:

Explanation:

Link:

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