AP BIOLOGY

Detailed explanation-1: -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-2: -A seed is a reproductive unit which develops from an ovule, usually after fertilization. Ovules are borne by both the angiosperms (true flowering plants) and the gymnosperms (which include the conifers).

Detailed explanation-3: -The ovule is the organ that forms the seeds of flowering plants. It is borne in the ovary of the flower and consists of nucellus protected by integuments, precursors of embryo/endosperm, and seed coat, respectively.

Detailed explanation-4: -A mature ovule consists of a food tissue covered by one or two future seed coats, known as integuments. A small opening (the micropyle) in the integuments permits the pollen tube to enter and discharge its sperm nuclei into the embryo sac, a large oval cell in which fertilization and development occur.

Detailed explanation-5: -The ovule is a flowering plant organ that produces seeds. It is produced in the ovary of flowers and comprises a nucellus that is protected by seed coats, integuments and embryo/endosperm precursors, and seed coat. In flowering plants, the ovule is known as the megasporangium.