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Question (1)

QN008814

Biogeochemical cycles are best described as the movement of:

(A) Energy only through ecosystems
(B) Matter between living and non-living components of Earth
(C) Organisms from one habitat to another
(D) Heat from the Sun to Earth

Correct Answer: B

Explanation:

Biogeochemical cycles recycle matter between biotic and abiotic components.

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Question (2)

QN008815

Which of the following is NOT a major biogeochemical cycle?

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

Correct Answer: D

Explanation:

Sound does not participate in matter cycling.

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Question (3)

QN008816

The primary role of biogeochemical cycles is to:

(A) Create new elements
(B) Recycle essential nutrients
(C) Destroy organic matter completely
(D) Increase Earth's temperature

Correct Answer: B

Explanation:

Nutrients are continuously recycled through ecosystems.

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Question (4)

QN008817

Carbon dioxide is removed from the atmosphere mainly by:

(A) Respiration
(B) Combustion
(C) Photosynthesis
(D) Decomposition

Correct Answer: C

Explanation:

Green plants absorb carbon dioxide during photosynthesis.

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Question (5)

QN008818

Which process returns carbon dioxide directly to the atmosphere from living organisms?

(A) Photosynthesis
(B) Respiration
(C) Nitrogen fixation
(D) Sedimentation

Correct Answer: B

Explanation:

Respiration releases carbon dioxide.

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Question (6)

QN008819

If a plant absorbs 44 g of CO₂ during photosynthesis, the mass of carbon obtained is approximately:

(A) 12 g
(B) 22 g
(C) 32 g
(D) 44 g

Correct Answer: A

Explanation:

Molecular mass of CO₂ = 44; carbon mass = 12 g.

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Question (7)

QN008820

Which reservoir contains the largest amount of carbon among the following?

(A) Atmosphere
(B) Living organisms
(C) Fossil fuels
(D) Sedimentary rocks and limestone

Correct Answer: D

Explanation:

Most carbon is stored in sedimentary rocks.

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Question (8)

QN008821

Burning fossil fuels mainly increases the atmospheric concentration of:

(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Hydrogen

Correct Answer: C

Explanation:

Combustion releases carbon dioxide.

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Question (9)

QN008822

During decomposition, carbon present in dead organisms is mainly released as:

(A) Carbon dioxide
(B) Oxygen
(C) Nitrogen gas
(D) Helium

Correct Answer: A

Explanation:

Decomposers release carbon dioxide during decomposition.

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Question (10)

QN008823

If a forest removes 500 kg of CO₂ per day through photosynthesis and releases 320 kg through respiration, the net removal is:

(A) 180 kg
(B) 820 kg
(C) 500 kg
(D) 320 kg

Correct Answer: A

Explanation:

Net removal = 500 − 320 = 180 kg.

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Question (1)

Biogeochemical cycles are best described as the movement of:

Explanation:

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Question (2)

Which of the following is NOT a major biogeochemical cycle?

Explanation:

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Question (3)

The primary role of biogeochemical cycles is to:

Explanation:

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Question (4)

Carbon dioxide is removed from the atmosphere mainly by:

Explanation:

Link:

Question (5)

Which process returns carbon dioxide directly to the atmosphere from living organisms?

Explanation:

Link:

Question (6)

If a plant absorbs 44 g of CO₂ during photosynthesis, the mass of carbon obtained is approximately:

Explanation:

Link:

Question (7)

Which reservoir contains the largest amount of carbon among the following?

Explanation:

Link:

Question (8)

Burning fossil fuels mainly increases the atmospheric concentration of:

Explanation:

Link:

Question (9)

During decomposition, carbon present in dead organisms is mainly released as:

Explanation:

Link:

Question (10)

If a forest removes 500 kg of CO₂ per day through photosynthesis and releases 320 kg through respiration, the net removal is:

Explanation:

Link:

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