After which cell-stage does the blastulation occur?

4-8 cells

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8-16 cells

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24-30 cells

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60-72 cells

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Solution

The correct option is B 8-16 cells
After fertilization, the zygote is formed. The zygote divides mitotically to form 2, 4, 8, 16 celled stages. These cells are known as blastomeres. Morula is a solid ball of 8-16 cells formed during the early embryonic stage. Blastulation occurs after this stage. Blastocyst gets implanted into the uterine endometrium.

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