101.Which one of the following is not a plant hormone ?

The correct answer is (c), insulin. Insulin is a hormone that is produced by the pancreas and helps to regulate blood sugar levels. It is not a plant hormone.

Cytokinins are plant hormones that promote cell division and cell growth. They are also involved in the regulation of plant development, including the development of roots and shoots.

Ethylene is a plant hormone that is involved in the ripening of fruits and vegetables. It also plays a role in the abscission of leaves and flowers.

Gibberellins are plant hormones that promote stem elongation and leaf expansion. They are also involved in the regulation of flowering and seed germination.