Corpus luteum in pregnancy has a long life. However, if fertilisation does not take place it remains active only for 10-12 days . Why?

The corpus luteum, which means yellow body in Latin, is what is left of the follicle after a woman ovulates. During the follicular phase of a woman’s cycle, several follicles...

In a flower fertilisation requires both male and female gametes. If pollination does not occur, male gamete is not available hence fertilisation cannot take place.

The process or mechanism of transfer of pollen grains from the anther to the stigma is termed pollination. The fusion of male and female gaemtes giving rise to zygote is termed fertilisation The site...

Hints— (a) Sperm enters through the vaginal passage during sexual intercourse and moves upwards. (b) Egg released from the ovary reaches the oviduct. (c) Sperm encounters egg in the oviduct and fertilization takes place. (d) Egg...

Hint— Give explanation using the Figure. Planets do not twinkle as they are closer to earth and are seen as extended sources.

Liverwort – In liverworts, the main plant-body is haploid (gametophytic). It bears the male and female sex organs which produce gametes. These gametes fuse to form a zygote. The zygote...

(a) Corpus luteum − Corpus luteum is formed from the ruptured Grafiaan follicle. It secretes progesterone hormone during the luteal phase of the menstrual cycle. A high level of progesterone...

B alone finish work in x days A alone work in x - 5 A one day works= 1/(x-5) and B one day works = 1/x A+B one day work = 1/6 so, 1/(x-5)...

(e) Required number of days = 6x12 /6+12 = 4 days

If I would have to stay alone in a small tent for two days. I would take these 10 things along with me-cloths, sweater, blanked, torch, packaged food items, water,...