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Question

Which of the following events are a part of a menstrual cycle?

i. The pituitary gland stimulates ovaries to produce oestrogen and progesterone hormones.

ii. Egg or the female gamete is released.

iii. Oestrogen stimulates the uterus to build up extra tissue and blood layer to make the wall nutritious for a zygote.

iv. In the absence of fertilisation, the egg or the female gamete is eliminated from the body along with the uterus lining which comes out as blood at the time of menstruation.


  1. i, ii and iv

  2. i , ii and iv

  3. ii, iii and iv

  4. i, ii, iii and iv


Solution

The correct option is D

i, ii, iii and iv


The ovaries in females release one egg alternately every month which is stimulated by the release of oestrogen and progesterone from the pituitary gland. The oestrogen also builds up a lining of blood in the inner wall of the uterus which prepares the uterus for pregnancy. In case of absence of fertilization, the body gets rid of the egg along with the inner lining of the uterus which comes out as menstrual blood. The cycle occurs once in every 28-30 days.

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