Which of the following is a male accessory reproductive gland?

Give two examples each of the following:
$(a)$ Plants having unisexual flowers
$(b)$ Agents of pollination
$(c)$ Physical changes on puberty that are common to both boys and girls.

Offspring formed by asexual method of reproduction have greater similarity among themselves because
$(i)$ asexual reproduction involves only one parent
$(ii)$ asexual reproduction does not involve gametes
$(iii)$ asexual reproduction occurs before sexual reproduction
$(iv)$ asexual reproduction occurs after sexual reproduction

Differentiate between plumule and radicle.

$(a)$ Give the functions of $(i)$ Stigma $(ii)$ Ovary. $(b)$ State in brief the formation of seed in a flower.

Why does the lining of the uterus become thick and spongy every month?