EVERYDAY SCIENCE

Detailed explanation-1: -Endosperm is a nutritive tissue present in the seeds of most of the flowering plants following fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.

Detailed explanation-2: -Answer and Explanation: Gymnosperms and angiosperms are plants that store their food in seeds.

Detailed explanation-3: -In angiosperms, the megagametophyte (female or egg-producing gametophyte) is also called an embryo sac. The embryo sac develops within an ovule, which is contained within the ovary of a flower.

Detailed explanation-4: -Angiosperm seeds develop from ovules within the ovary, and have three parts: a seed coat encloses an embryo together with a stored food supply known as endosperm. In angiosperms, fruits enclose seeds.

Detailed explanation-5: -gametophyte of angiosperms (called the embryo sac) is tiny and contains only a few (typically eight) nuclei; the cytoplasm associated more or less directly with these nuclei is not partitioned by cell walls.