b. gibberellin is the type of hormone that affects plant growth and the development of fruits and seeds.
Gibberellins are a class of plant hormones that play an important role in plant growth and development. They are involved in many processes, including the elongation of stems and roots, the formation of flowers and fruits, and the germination of seeds. Gibberellins are also involved in the regulation of other hormones, such as auxins and cytokinins.
Other types of hormones that affect plant growth and development include auxins, which are involved in the regulation of cell growth and differentiation, and cytokinins, which promote cell division and the growth of roots and shoots. Ethylene, another plant hormone, is involved in the ripening of fruits and the response to stress.