Explain what happens when:
(a) Testosterone is released in males.
(b) Pollen grain falls on the stigma of the flower.
© Egg fuses with sperm cell.
(d) Planaria is cut into many pieces.
(e) Buds are formed on the notches of the Bryophyllum leaf.
(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.
© Zygote is formed.
(d) Each piece grows into a complete organism.
(e) Buds may fall on the soil and develop into new plants.