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Question
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What happens if the egg is not fertilised?

Answer

The ovary releases one egg every month and the uterus prepares for the launching of the zygote by thickening its walls. If the egg is not fertilised, the uterine lining slowly breaks down and sheds through the vagina as blood an mucus. This cycle takes place roughly every month and is known as menstruation and lasts for about two to eight days.

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Some More Questions From Our Environment Chapter

Name two organisms which reproduce by (a) budding (6) fragmentation and (c) spore formation.

Why cannot all multicellular organisms divide cell-by-cell like Spirogyra?

How is the problem of dobling of the amount of DNA solved ?

Write names of five plants in which stem is used to produce a new plant.

Give one example of plant which uses leaves for propagation. Draw propagation organ.

List four methods of vegetative propagation which are exploited by man in propagating plants in garden and nurseries.

Write five names of plants which are usually propagated by cutting method.

Name a ornamental plant which is grown by the vegetaive propagation of stem. 

What are the different types of asexual reproduction?

Describe the binary and multiple modes of asexual reproduction in organisms.