Identify the correct statement about photosynthesis: MCQ with Answer and Explanation

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Identify the correct statement about photosynthesis:

A. ATP and NADPH are produced during the Calvin cycle.

B. Rubisco is the enzyme that fixes CO₂ in the Calvin cycle.

C. The light reactions occur in the stroma.

D. Photorespiration increases the efficiency of photosynthesis.

Answer: Option B

Solution (By JKExamLibrary)

Rubisco catalyzes CO₂ fixation. Light reactions occur in thylakoids, ATP/NADPH are produced there, Calvin cycle uses them. Photorespiration reduces efficiency.

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Question #1

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Consider statements about cell division: 1. Cytokinesis in plant cells occurs by cell plate formation. 2. Meiosis maintains the chromosome number. 3. Mitosis occurs in somatic cells. Which are correct?

A. 1, 2 and 3

B. 1 and 3 only

C. 1 and 2 only

D. 2 and 3 only

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Correct Answer: Option B

Explanation:
In plant cells, which have rigid cell walls, cytokinesis occurs by the formation of a new cell wall (cell plate) in the middle of the cell. Mitosis is equational division occurring in somatic cells for growth and repair, maintaining the same chromosome number. Meiosis is reductional division, halving the chromosome number to produce gametes. Thus, statements 1 and 3 are correct.

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Question #2

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The disorder caused by the deficiency of antidiuretic hormone (ADH) is:

A. Diabetes mellitus

B. Diabetes insipidus

C. Addison's disease

D. Cushing's syndrome

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Correct Answer: Option B

Explanation:
Diabetes insipidus results from ADH deficiency (or resistance), causing polyuria, polydipsia, and dilute urine. Diabetes mellitus is insulin-related, Addison's is adrenal insufficiency, Cushing's is excess cortisol.

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Question #3

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The substance that gives skin its pigment and protects against UV radiation is:

A. Collagen

B. Elastin

C. Melanin

D. Keratin

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Correct Answer: Option C

Explanation:
Melanin, produced by melanocytes in the epidermis, is the primary pigment determining skin, hair, and eye color. It absorbs UV radiation, protecting DNA from damage. Keratin is a structural protein in hair and nails, collagen provides connective tissue strength, elastin elasticity. Albinism results from melanin deficiency.

This question belongs to: Science Biology

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