The scientist who discovered the sex chromosomes was: MCQ with Answer and Explanation

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The scientist who discovered the sex chromosomes was:

A. Thomas Hunt Morgan

B. Walter Sutton

C. Gregor Mendel

D. Nettie Stevens

Answer: Option D

Solution (By JKExamLibrary)

Nettie Stevens (1905) discovered that sex is determined by the XY chromosomes in beetles. Morgan later confirmed chromosomal theory. Mendel discovered laws of inheritance.

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Question #1

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Assertion (A): Green plants are called autotrophs.
Reason (R): They can synthesize their own food by photosynthesis.

A. Both A and R are true, and R is the correct explanation.

B. Both A and R are true, but R is not the correct explanation.

C. A false, R true.

D. A true, R false.

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Correct Answer: Option A

Explanation:
Autotrophs produce organic compounds from inorganic CO₂ and water using light energy (photosynthesis). This exactly defines green plants. So both are true, and R explains A.

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Question #2

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Identify the correct statement about photosynthesis:

A. The light reactions occur in the stroma.

B. Photorespiration increases the efficiency of photosynthesis.

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

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

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Correct Answer: Option D

Explanation:
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 #3

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The deficiency of vitamin B₁ causes:

A. Pellagra

B. Scurvy

C. Rickets

D. Beriberi

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Correct Answer: Option D

Explanation:
Beriberi results from thiamine (B₁) deficiency, characterized by neurological and cardiovascular symptoms. Scurvy is vitamin C deficiency, pellagra niacin (B₃), rickets vitamin D. Thiamine is a coenzyme in carbohydrate metabolism.

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