AP BIOLOGY

Detailed explanation-1: -A seed is formed when a pollen grain lands on the stigma of the flower, and sends down a pollen tube which releases a sperm cell into the ovule. This fertilization or joining of the sperm cell and ovule forms a cell called a zygote. The zygote then develops into an embryo.

Detailed explanation-2: -Once pollen gets transferred to the stigma the male gametes from pollen grains release and fuse with the egg in the ovule to form a zygote. This process of fusion of gametes is called fertilization. The zygote thus formed, divides and develops into an embryo, and later into a seed.

Detailed explanation-3: -The parent plants have male and female sex cells, called gametes. The genetic material from the male and female gametes combines to produce offspring. We call this process fertilization. The product of sexual reproduction are seeds.

Detailed explanation-4: -A seed is formed when fertilised ovule divides by mitosis. It stores food and has the potential to develop into a new plant under optimal conditions. Fertilization is the process of fusion of male gamete and female gamete to form a zygote.

Detailed explanation-5: -Seeds of angiosperms are often called the products of sexual reproduction because these are formed by the fusion of gametes. Sexual reproduction is the production of new living organisms by combining genetic information from two individuals of different types (sexes).