The technique of producing many identical copies of a plant from a single tissue is: MCQ with Answer and Explanation

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The technique of producing many identical copies of a plant from a single tissue is:

A. Hybridization

B. Cross-pollination

C. Selective breeding

D. Tissue culture (micropropagation)

Answer: Option D

Solution (By JKSSB Mock Tests)

Tissue culture (micropropagation) involves growing plant cells/tissues on a sterile nutrient medium to regenerate whole plants, producing clones. Hybridization is crossing varieties, cross-pollination is natural or artificial pollination, selective breeding chooses parents.

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Question #1

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Assertion (A): Double circulation is seen in birds and mammals.
Reason (R): It ensures complete separation of oxygenated and deoxygenated blood.

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

B. A false, R true.

C. A true, R false.

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

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Correct Answer: Option A

Explanation:
Double circulation (pulmonary and systemic) with a four-chambered heart keeps oxygenated and deoxygenated blood separate, increasing efficiency. R correctly explains A.

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Question #2

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Which part of the human digestive system produces hydrochloric acid?

A. Goblet cells of intestine

B. Liver

C. Parietal cells of stomach

D. Pancreas

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Correct Answer: Option C

Explanation:
Parietal (oxyntic) cells in the gastric glands of the stomach secrete hydrochloric acid (HCl), which activates pepsinogen to pepsin, kills bacteria, and provides an acidic pH (1.5-2.0) for protein digestion. Liver produces bile, pancreas secretes digestive enzymes and bicarbonate, goblet cells secrete mucus. Intrinsic factor, required for vitamin B₁₂ absorption, is also secreted by parietal cells.

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Question #3

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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, and R is the correct explanation.

B. A false, R true.

C. A true, R false.

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

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Correct Answer: Option A

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

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