Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions

Explain the menstruation phases in the menstrual cycle of a human female.

‘A proper understanding of the menstrual cycle can help immensely in family planning.’ Do you agree with the statement? Provide reasons for your answer.

Answer the following question.
Explain the process of splicing of hn-RNA in a eukaryotic cell.

From among the sets of terms given below, identify those that are associated with the gynoecium.

From the statements given below choose the option that are true for a typical female gametophyte of a flowering plant.

1. It is 8-nucleate and 7-celled at maturity
2. It is free-nuclear during the development
3. It is situated inside the integument but outside the nucellus
4. It has an egg apparatus situated at the chalazal end

Corpus luteum develops under the influence of ______.

Corpus luteum produces ______.

The correct sequence of hormone secretion from the beginning of menstruation is ______.

Immediately after ovulation, the mammalian egg is covered by a membrane known as ______.

The mammalian corpus luteum produces ______.

Secretion of progesterone by corpus luteum is initiated by ______.

Which set is similar?

Mainly which type of hormones control the menstrual cycle in human beings?

Ovulation in the human female normally takes place during the menstrual cycle ______.

Withdrawal of which of the following hormones is the immediate cause of menstruation?

In the human female, menstruation can be deferred by the administration of ______.

Which one of the following is the correct matching of the events occurring during menstrual cycle?

Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?

Menstruation is triggered by a sudden decline in the amount of hormone secreted by corpus luteum. Identify the hormone.

Level of which hormones are at their highest during the luteal phase (second half of the cycle) of the menstrual cycle?