Question

The reproductive cycle in primate female is
A. Menstrual cycle
B. Oestrous cycle
C. Menopause
D. Puberty

Answer 1

Hint: The reproductive cycle in primate female is brought about by purely hormonal changes which in turn causes changes in reproductive tissues. These changes take place in primate females during their reproductive phase and it is a periodical change repeated at a mean interval of about 28/29 days. It is essential for sexual reproduction.

Complete answer: The menstrual cycle is the regular periodic natural change that happens within the female genital system (in the uterus and ovaries, to be more specific) and ensures pregnancy is possible.
1. The cycle is required for the release of oocytes i.e. the egg cells, and for the preparation of the uterus for pregnancy.
2. The cycle occurs mainly due to the increase and fall of estrogen and progesterone.
3. This cycle leads to the thickening of the lining of the uterus, and therefore the growth of an egg, (which is required for pregnancy).
4. The egg is released from an ovary around day fourteen within the cycle after which if it gets fertilized by the male gamete then pregnancy takes place, or if not, then the uterus lining (the thickened lining of the uterus provides nutrients to an embryo after implantation) is shed in the form of mucus, and blood; this is what is referred to as menstruation or a ‘period’.

So, the correct answer is option A. Menstrual cycle.
Note: Each menstrual cycle can be divided into three phases, supported by events within the ovary (ovarian cycle) or within the uterus (uterine cycle). The ovarian cycle consists of the follicular phase (growth of follicles in size and maturation), ovulation (release of egg cell), and secretory phase whereas the uterine cycle is split into menstruation, proliferative phase, and luteal phase.