CBSE Class 12 Biology — Human Reproduction

Select the option that shows correct statements : (i) Corpus luteum secretes progesterone. (ii) Only FSH attains a peak level in middle of cycle. (iii) LH surge induces rupture of graafian follicle. (iv) Luteal phase of menstrual cycle is also called proliferative phase.

Which connective tissue connects ovary to pelvic wall and uterus ?

(a) Trace the events from fertilization till implantation of blastocyst in human female. Also mention the site where fertilization takes place. [5] OR (b) (i) Case studies of some couples are given below. They were not able to have kids even though the parents were not taking any precautions. They also do not wish to adopt a child or take the help of donors. Study these cases and suggest an appropriate Assisted Reproductive Technology that could help them. Case I – Female – Normal Reports. Male – Normal sperms but no connection between epididymis and vas deferens. [1] Case II – Female – Normal eggs but Fallopian tube blocked. Male – Normal sperms. Male reports are normal. [1] Case III – Female – Normal Reports. Male – Low sperm count with less motility. [1] (ii) Copper releasing intrauterine devices are very effective and popular contraceptive devices. Name any two copper releasing IUDs. Write two reasons that make them effective contraceptives. [2]