In which plant does vegetative reproduction occur through the stem?

$A$ feature of reproduction that is common to $Amoeba$,$Spirogyra$ and $Yeast$ is that

During adolescence,several changes occur in the human body. Mark one change associated with sexual maturation in boys:

Name two simple organisms having the ability of regeneration.

In the given figure,label the parts and mention their functions:
$(a)$ Production of egg
$(b)$ Site of fertilisation
$(c)$ Site of implantation
$(d)$ Entry of the sperms

Give the respective scientific terms used for studying:
$(i)$ The mechanism by which variations are created and inherited,and
$(ii)$ The development of new types of organisms from existing ones.