(a) (i) Formation of sperms, change in appearance. .
(ii) Thick hair growth on the face and voice begin to crack.
(b) A tube grows out of the pallen grain and travel through the style to reach the ovary.
(c) Zygote is formed.
(d) Each piece grows into a complete organism.
(e) Buds may fall on the soil and develop into new plants.