The thick and spongy uterine wall breaks when:

The egg is not released by ovary

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The egg is not fertilized by sperm

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Fertilization of egg and sperm occurs

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Embryo starts developing in uterus

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Solution

The correct option is B
The egg is not fertilized by sperm

In females, the uterus prepares itself to receive a mature egg released from ovary every month. In case the fertilization of egg and sperm does not occur, the thick and spongy lining of uterus is no more required. It then breaks and is released from vagina as blood and mucous.

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Similar questions

Given below are the events that lead to pregnancy and development of embryo;

Which of the following options give the correct order of the sequence in which they occur?

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