Sexual Reproduction in Flowering Plants Test - 3

In case of rice and wheat, the pollen grains remain viable for a very less time, about 30 minutes.

Embryo sac is also known as the female gametophyte or megagametophyte.

Generally in seeds, the nucleus is used up. However, in certain cases where it is not used up, it forms a thin layer on the outside of the endosperm and is known as the perisperm.

In Meiosis-I, the cells always divide along the transverse plane.

Wind pollination describes the process of the transfer of pollen from one individual plant to another, whereby the pollen is carried by air currents. This occurs mostly in grasses and gymnosperms.

Micropyle occurs in the ovule, and so, ultimately in the seed after fertilisation.

The layer of nutritive tissue derived from the nucellus that surrounds the embryo of a seed in some angiosperms is called perisperm. The perisperm is diploid, while the endosperm is triploid.

The primary endosperm nucleus divides and after many divisions fills the seed around the embryo with a triploid tissue called the endosperm.

Stigma is the receptive spot in the gynoecium which lodges the pollen grains. The ovary contains ovules. The embryo sac is present inside the ovule. The region of the ovary wall where the ovules are attached is called the placenta.

Aristolochia is an entomophilous flower and smells like decaying tobacco.