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Q.

Which of the following is the first change that occurs to the zygote after fertilisation?

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a

It divides to form a hollow ball of cells, called the blastocyst.

b

It begins to secrete the hormones.

c

It contacts the endometrial wall of the uterus and becomes buried inside it.

d

It initiates the formation of a placenta.

answer is A.

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Detailed Solution

The zygote divides mitotically to form 8 -16 daughter cells called blastomeres. This stage is a solid stage called morula which continues to divide and transforms into a hollow stage called blastocyst.
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