Which of the following statements about the chloroplast is correct? MCQ with Answer and Explanation

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Which of the following statements about the chloroplast is correct?

A. It has 70S ribosomes in its outer membrane.

B. It is found in all eukaryotic cells.

C. Thylakoids are stacked to form cristae.

D. The stroma is the site of the Calvin cycle.

Answer: Option D

Solution (By JKExamLibrary)

Calvin cycle occurs in the stroma. Chloroplasts are only in plants/algae; thylakoids stack into grana; cristae are in mitochondria; 70S ribosomes are in stroma, not membrane.

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Question #1

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Consider the following statements about the immune system:
1. Macrophages are phagocytic cells.
2. B cells produce antibodies.
3. T cells are part of innate immunity.
Which of the above is/are correct?

A. 2 and 3 only

B. 1, 2, and 3

C. 1 and 3 only

D. 1 and 2 only

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Correct Answer: Option D

Explanation:
Macrophages phagocytose; B cells make antibodies. T cells are part of adaptive immunity, not innate. So 3 is incorrect.

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Question #2

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Consider the following statements about the circulatory system:
1. Arteries carry blood away from the heart.
2. Veins have valves to prevent backflow.
3. Capillaries are thick-walled vessels.
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 C

Explanation:
Arteries carry blood from the heart; veins have valves; capillaries are thin-walled for exchange. Statement 3 is false. So 1 and 2 are correct.

This question belongs to: Science Biology

Question #3

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The 'Hormone Leptin' acts on the hypothalamus to regulate energy balance. It does this primarily by binding to receptors in the:

A. Suprachiasmatic nucleus

B. Arcuate nucleus

C. Lateral hypothalamus

D. Ventromedial hypothalamus

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Correct Answer: Option B

Explanation:
Leptin is a hormone secreted by adipose tissue that signals the status of body fat stores to the brain. It acts primarily on the arcuate nucleus (ARC) of the hypothalamus. The ARC contains two key populations of neurons: one that co-expresses Neuropeptide Y (NPY) and Agouti-related peptide (AgRP), which stimulate appetite, and another that expresses Pro-opiomelanocortin (POMC) and Cocaine- and amphetamine-regulated transcript (CART), which suppress appetite. Leptin binds to receptors on these neurons, inhibiting the NPY/AgRP neurons and stimulating the POMC/CART neurons, thereby reducing appetite and increasing energy expenditure.

This question belongs to: Science Biology

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