AP BIOLOGY

Detailed explanation-1: -The seeds undergo rapid expansion and growth of the embryo and subsequently rupturing the covering layers and emergence of the radicle. This radicle emergence is considered the completion of germination.

Detailed explanation-2: -germination, the sprouting of a seed, spore, or other reproductive body, usually after a period of dormancy. The absorption of water, the passage of time, chilling, warming, oxygen availability, and light exposure may all operate in initiating the process.

Detailed explanation-3: -Germination begins with an increase of metabolic activity within the seed. The first visible sign of germination in angiosperms (flowering plants) is generally an enlargement of the seed, due to intake of water from the environment. The seed’s covering may wrinkle and crack at this time.

Detailed explanation-4: -Emergence of radicle is the first visible symptom of germination, which results from the elongation of cells rather than from the cell division. It is observed that under fabvourable conditions, the emergence of radicle may take place within a few hours as in non-dormant seeds or a few days after seed sowing.