Which of the following plant hormones helps in the growth of plant stems?

Correct option is A

The correct answer is (a) Gibberellin.
· Gibberellins are a group of plant hormones that play a crucial role in promoting the growth and elongation of plant stems.
· They stimulate cell division and elongation, which leads to increased stem height.
· Gibberellins also influence other aspects of plant development, such as seed germination, flowering, and fruit development.
Information Booster:
· Ethylene: Ethylene is a gaseous plant hormone involved in the ripening of fruits and the regulation of various developmental processes, including leaf abscission and flower wilting.
· Cytokinin: Cytokinins are plant hormones that promote cell division and growth, especially in roots and shoots. They also delay leaf senescence.
· Abscisic acid: Abscisic acid (ABA) is a plant hormone that inhibits growth and promotes dormancy. It plays a significant role in stress responses, such as closing stomata during drought conditions.