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Question (11)

QN008864

Saturation of natural carbon sinks refers to:

(A) Forests absorbing unlimited CO₂
(B) Oceans and forests losing ability to absorb excess CO₂
(C) Increase in oxygen production
(D) Decrease in water cycle

Correct Answer: B

Explanation:

Carbon sinks become less effective

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Question (12)

QN008865

Atmospheric CO₂ increased from 315 ppm to 420 ppm. The increase is:

(A) 95 ppm
(B) 105 ppm
(C) 115 ppm
(D) 125 ppm

Correct Answer: B

Explanation:

420 - 315 = 105 ppm

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Question (13)

QN008866

The percentage increase in CO₂ from 315 ppm to 420 ppm is approximately:

(A) 20%
(B) 25%
(C) 33%
(D) 50%

Correct Answer: C

Explanation:

Increase ≈ 33%

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Question (14)

QN008867

If CO₂ concentration is 420 ppm, it means:

(A) 420 molecules per 100 molecules of air
(B) 420 molecules per 1,000,000 molecules of air
(C) 420 grams of CO₂ in air
(D) 420% CO₂ in atmosphere

Correct Answer: B

Explanation:

ppm means per million

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Question (15)

QN008868

According to global carbon distribution, oceans contain about:

(A) 21% carbon
(B) 49% carbon
(C) 71% carbon
(D) 1% carbon

Correct Answer: C

Explanation:

Oceans store most carbon

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Question (16)

QN008869

The fraction of carbon present in the atmosphere is approximately:

(A) 71%
(B) 49%
(C) 1%
(D) 21%

Correct Answer: C

Explanation:

Atmosphere has very small carbon fraction

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Question (17)

QN008870

If atmospheric CO₂ increases significantly, the most likely immediate effect is:

(A) Decrease in greenhouse effect
(B) Intensification of global warming
(C) Reduction of solar radiation
(D) Increase in ozone thickness

Correct Answer: B

Explanation:

More CO₂ increases warming

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Question (18)

QN008871

When ocean water warms, its ability to absorb CO₂:

(A) Increases significantly
(B) Decreases
(C) Becomes infinite
(D) Remains unchanged

Correct Answer: B

Explanation:

Warm water dissolves less gas

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Question (19)

QN008872

Deforestation indirectly increases atmospheric CO₂ because:

(A) Plants stop photosynthesis and CO₂ uptake reduces
(B) Oceans freeze
(C) Nitrogen cycle stops
(D) Sunlight decreases

Correct Answer: A

Explanation:

Reduced photosynthesis increases CO₂

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Question (20)

QN008873

Excess nitrates in water bodies mainly cause:

(A) Increase in fish population
(B) Eutrophication and oxygen depletion
(C) Increase in water purity
(D) Formation of ozone

Correct Answer: B

Explanation:

Leads to algal blooms and low oxygen

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Question (11)

Saturation of natural carbon sinks refers to:

Explanation:

Link:

Question (12)

Atmospheric CO₂ increased from 315 ppm to 420 ppm. The increase is:

Explanation:

Link:

Question (13)

The percentage increase in CO₂ from 315 ppm to 420 ppm is approximately:

Explanation:

Link:

Question (14)

If CO₂ concentration is 420 ppm, it means:

Explanation:

Link:

Question (15)

According to global carbon distribution, oceans contain about:

Explanation:

Link:

Question (16)

The fraction of carbon present in the atmosphere is approximately:

Explanation:

Link:

Question (17)

If atmospheric CO₂ increases significantly, the most likely immediate effect is:

Explanation:

Link:

Question (18)

When ocean water warms, its ability to absorb CO₂:

Explanation:

Link:

Question (19)

Deforestation indirectly increases atmospheric CO₂ because:

Explanation:

Link:

Question (20)

Excess nitrates in water bodies mainly cause:

Explanation:

Link:

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