BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Abscission of leaves is the normal shedding of an old leaf at the base of the petiole such as that which occurs at the time of autumn. The process of leaf abscission includes many physical as well as biochemical changes which are majorly regulated by the plant hormones.

Detailed explanation-2: -The actual term used to describe this process of leaf drop is known as abscission. Although some parts of trees like stems and buds can handle freezing temperatures, most leaves cannot.

Detailed explanation-3: -: the act or process of cutting off : removal. : the natural separation of flowers, fruit, or leaves from plants at a special separation layer.

Detailed explanation-4: -The abscission of leaves is caused by seasonal changes, whereby a reduction in sunlight triggers a decrease in chlorophyll and photosynthesis. This process, in turn, causes a programmed self-pruning that is characteristic of abscission.

Detailed explanation-5: -layer of tissue called the abscission layer develops at the base of each leaf stalk, and at this point the stalk breaks and the leaf is shed. The massive leaf drop that ensues during autumn has earned the season its alternate designation, fall.