Question

The hormone which promotes rapid internode or petiole elongation in deep water rice plants, also

• A. Both a and b
• B. Inhibits seed germination
• C. Breaks seed and bud dormancy
• D. Initiates germination in peanut seeds and sprouting of potato tubers

Answer 1

The correct option is A Both a and b

Ethylene is a gaseous natural plant growth hormone. Ethylene is a natural product of metabolism (ripening of fruits) in plants. It enhances the respiration rate during the ripening of fruits.

Ethylene affects the shoots in various ways. Sometimes, buds in a plant may get dormant because of unfavourable environmental conditions. Ethylene breaks seed dormancy and makes the seed ready for germination. It also initiates germination in some seeds, e.g., peanut.

Ethylene can break the dormancy of the buds in potatoes as well and promote their growth, causing sprouting of potato tubers.

Ethylene promotes the elongation of internodes in deep-water rice plants so that the leaves and upper parts of the plant remain above water.