Question 1:

Which plant hormone is responsible for promoting cell elongation and stem growth?

Explanation: The plant hormone responsible for promoting cell elongation and stem growth is auxin. Auxin is produced in the apical meristem and moves downward, stimulating cell elongation in the stem. Therefore, option B is correct.

Question 2:

Which plant hormone is involved in the regulation of fruit ripening?

Explanation: The plant hormone involved in the regulation of fruit ripening is ethylene. Ethylene promotes fruit ripening by stimulating the production of enzymes that break down cell walls and soften the fruit. Therefore, option B is correct.

Question 3:

Which plant hormone is responsible for inhibiting seed germination?

Explanation: The plant hormone responsible for inhibiting seed germination is abscisic acid. Abscisic acid helps maintain seed dormancy and prevents premature germination. It also plays a role in seed and bud dormancy during unfavorable environmental conditions. Therefore, option C is correct.

Question 4:

Which plant hormone is involved in the promotion of lateral bud growth?

Explanation: The plant hormone involved in the promotion of lateral bud growth is cytokinin. Cytokinin stimulates cell division in lateral buds, leading to the growth of new shoots. Therefore, option C is correct.

Question 5:

Which plant hormone is responsible for leaf abscission (shedding) during autumn?

Explanation: The plant hormone responsible for leaf abscission (shedding) during autumn is ethylene. Ethylene promotes the detachment of leaves by breaking down the cell walls at the base of the leaf petiole. Therefore, option B is correct.