HORTICULTURE

Detailed explanation-1: -The cotyledons feed the plant until all the nutrients are used up. Once they’re spent, they naturally wither and fall off the stem as new leaves form.

Detailed explanation-2: -Explantion fo falling of: Because it is a storage organ, the cotyledon is an inefficient provider for the adult plant, so it will shrivel and fall away from the plant as shade from the growing plant covers it, either because of senescence or because it is being edged out by an emerging root.

Detailed explanation-3: -It stores the food and helps produce the energy needed for the seed to grow, since it takes time for the first leaf to develop. When the seed has grown enough to make its first true leaves, the cotyledon can no longer provide the energy needed by the plant, it dries up and falls off.

Detailed explanation-4: -Cotyledon is a significant part of plant embryo within the seed. It stores food materials that are supplied to the seeds at the time of germination. After germination the cotyledons become the first leaf of the seedling. When the seedling grows into a small plant with new leaves, the cotyledon dries up and shed down.

Detailed explanation-5: -Such five changes or steps occurring during seed germination are: (1) Imbibition (2) Respiration (3) Effect of Light on Seed Germination(4) Mobilization of Reserves during Seed Germination and Role of Growth Regulators and (5) Development of Embryo Axis into Seedling.