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Question

Foetus is the

A
well developed embryo
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B
blastocyst
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C
zygote
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D
male gamete
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Solution

The correct option is A well developed embryo
When the sperm fertilises the egg, the single-celled fertilised egg is called the zygote. The zygote undergoes repeated cell divisions to form a stage called the blastocyst. In this stage, there is a sphere of cells which encloses a inner mass of cells. The inner mass of cells develops into an embryo. As the embryo develops, from around the 11th week it is known as a foetus.

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