Consider statements about cell biology: 1. The cell membrane is selectively permeable. 2. The nucleus contains genetic material. 3. Mitochondria are the site of photosynthesis. Which are correct? MCQ with Answer and Explanation

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Consider statements about cell biology: 1. The cell membrane is selectively permeable. 2. The nucleus contains genetic material. 3. Mitochondria are the site of photosynthesis. Which are correct?

A. 1 and 2 only

B. 1, 2 and 3

C. 2 and 3 only

D. 1 and 3 only

Answer: Option A

Solution (By JKExamLibrary)

The cell membrane (plasma membrane) is selectively permeable, regulating the passage of substances in and out of the cell to maintain internal homeostasis. The nucleus is the membrane-bound organelle that houses the cell's genetic material (DNA) organized into chromosomes, directing cellular activities. Mitochondria are the site of aerobic cellular respiration and ATP production; chloroplasts are the organelles where photosynthesis occurs in plant cells. Thus, statements 1 and 2 are correct.

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Question #1

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Consider statements about cell biology: 1. The cell membrane is selectively permeable. 2. The cell wall is present in all plant cells. 3. The nucleus is the control center of the cell. Which are correct?

A. 1, 2 and 3

B. 2 and 3 only

C. 1 and 3 only

D. 1 and 2 only

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Correct Answer: Option A

Explanation:
The cell membrane (plasma membrane) is selectively permeable, regulating the passage of substances in and out of the cell. The cell wall is a rigid, non-living outer layer present in all plant cells, providing structural support and shape. The nucleus is the control center of the eukaryotic cell, housing the genetic material (DNA) and directing cellular activities like growth, metabolism, and reproduction. All three statements are correct.

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Question #2

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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. 2 and 3 only

B. 1, 2, and 3

C. 1 and 2 only

D. 1 and 3 only

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Correct Answer: Option B

Explanation:
All are correct: photosynthesis fixes CO₂; respiration, combustion, and decomposition release it back, driving the carbon cycle.

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Question #3

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The vitamin that is essential for the proper development of the fetal nervous system is:

A. Vitamin B₁₂

B. Vitamin K

C. Vitamin D

D. Folic acid

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Correct Answer: Option D

Explanation:
Folic acid prevents neural tube defects like spina bifida. It is recommended during early pregnancy. B₁₂ is for DNA synthesis, D for bone, K for clotting.

This question belongs to: Science Biology

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