Bumblebees sonicate and pollinate plants in which anthers release pollen internally by buzz pollination.

Moth-pollinated flowers tend to be white, night-opening, large and showy with tubular corollas and a strong, sweet scent produced in the evening, night or early morning.

Anemophily is pollination by wind.

Pollination by butterflies is known as psychophily.

Butterfly-pollinated flowers tend to be large and showy, pink or lavender in colour, frequently having a landing area and usually scented.

In cleistogamy, self-pollination occurs before a flower opens.

If the pollen tube enters the ovule through micropyle, it is called porogamy.

Sapromyophily is pollination by flies which like dung, dead and decaying odour.

Chalazogamy is a process of fecundation in which the pollen tube penetrates into the embryo sac through the tissue of the chalaza.

Fusion of polar nuclei with sperm leads to endospore formation.

Germ tube is formed of intine layer.

A large number of seeds are formed by cross-pollination.

Fusion of egg cell and polar nuclei with two distinct sperms is called double fertilisation.

Endosperm tissue is triploid as it is formed by fusion of polar nuclei (2n) and male gamete (n).

Suspensor cell acts as a feeding organ of the embryo during its development.