The plant is bryophyllum or begonia. This type of reproduction is known as vegetative propogation. There is no fusion of male and female gamete in this type of reproduction or there is no fertilization so, it is asexual reproduction.

The pollen grains can not formed when all the androecium is removed immediately after the flower. The fruit is formed the ovary.

The meaning of earthworm reproduce through regeneration is that when earth worm is broken into pieces the new young ones are produced from the broken parts.

The plant of sub kingdom phanerogams have sexual reproduction because they are flowering plant as the flower has male and female reproductive cell or gametes.

It is found in gills of mushroom.

The small opening at the apex of the integument or in the way to egg from pollen tube is called micropyle.

Pea is bisexual plant i.e antherozoids and ovary mature at the same time and self pollination occurs. So, pea does not required external fertilization.

Sexual reproduction is not possible without meiosis cell division because meiosis cell division male and female gamete cannot be formed and sexual reproduction is impossible. So, meiosis cell division is essential in sexual reproduction.