Consider the following statements about the carbon cycle: 1. Photosynthesis removes CO₂ from the atmosphere. 2. Respiration and combustion return CO₂ to the atmosphere. 3. Decomposition releases CO₂. Which of the above is/are correct? MCQ with Answer and Explanation

Consider the following statements about the carbon cycle:
1. Photosynthesis removes CO₂ from the atmosphere.
2. Respiration and combustion return CO₂ to the atmosphere.
3. Decomposition releases CO₂.
Which of the above is/are correct?
A. 1, 2, and 3
B. 2 and 3 only
C. 1 and 2 only
D. 1 and 3 only
Answer: Option A
Solution (By JKSSB Mock Tests)
All are correct: photosynthesis fixes CO₂; respiration, combustion, and decomposition release it back, driving the carbon cycle.

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Practice More Biology Questions

Question #1
Consider statements about animal husbandry: 1. Poultry birds are reared for meat and eggs. 2. Dairy animals are reared for milk production. 3. Sericulture involves rearing honeybees. Which are correct?
A. 1 and 3 only
B. 1, 2 and 3
C. 1 and 2 only
D. 2 and 3 only

Correct Answer: Option C


Explanation:
Poultry farming involves the commercial rearing of birds, primarily chickens, for the production of meat (broilers) and eggs (layers). Dairy farming focuses on the breeding, rearing, and management of cattle, buffaloes, and other mammals for the production of milk and milk products. Sericulture is the rearing of silkworms (Bombyx mori) for silk production; the rearing of honeybees is called apiculture. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology
Question #2
Assertion (A): The pituitary gland is connected to the hypothalamus by a stalk.
Reason (R): This connection allows the hypothalamus to control pituitary hormone secretion.
A. Both A and R are true, but R is not the correct explanation.
B. A false, R true.
C. A true, R false.
D. Both A and R are true, and R is the correct explanation.

Correct Answer: Option D


Explanation:
The infundibulum connects them, and hypothalamic releasing/inhibiting hormones travel to the anterior pituitary; posterior pituitary stores hypothalamic hormones. R correctly explains A.

This question belongs to: Science Biology
Question #3
The type of root that grows from the stem or leaves is called:
A. Primary root
B. Fibrous root
C. Adventitious root
D. Taproot

Correct Answer: Option C


Explanation:
Adventitious roots arise from non-root tissues like stems, leaves, or branches. Examples: prop roots of banyan, stilt roots of maize, aerial roots of orchids. Taproot and fibrous roots develop from the radicle.

This question belongs to: Science Biology