What is double fertilisation
? Where does it take place in plants?
(a) What is ovulation? How often does it happen in human females? (b) Where does fertilisation take place in human females? (c) Explain why fertilisation is possible if mating takes place during the middle of the menstrual cycle. (d) What is meant by implantation? (e) What is placenta? What is its function? (f) What joins embryo to the placenta in mother's body?