Section-II V. Answer any Three of the following questions. 33) What is contraception? Briefly explain two barrier methods and two surgical methods to prevent conception. 34) Describe the structure of anatropous ovule with a labelled diagram. 35) Draw a neat labelled diagram of human male reproductive system. 36) Discuss the development of 7-celled 8-nucleated mature embryo sac. 37) a) Differentiate spermiation and spermiogenesis. b) Define the following i) Parturition ii) Colostrum iii) Implantation

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days, followed by 7 days when no hormones are ingested. which of the following statements most accurately describes the effects of birth-control pills? -birth-control pills maintain constant levels of estrogens and/or progesterone so there is no surge in lh and ovulation does not occur.-birth-control pills inhibit the development of the uterine lining so implantation of a fertilized oocyte cannot occur.-birth-control pills maintain constant levels of estrogens and/or progesterones and mask the release of the oocyte from the follicle.-the 7 days with no hormones does not allow a thick enough uterine lining to form so a fertilized oocyte cannot implant.