NEET Biology question
Given below are four statements (i)-(iv) regarding embryonic development in humans. (i) Cleavage divisions bring about a considerable increase in the mass of protoplasm. (ii) With more cleavage divisions, the resultant blastomeres become smaller and smaller. (iii) The blastomeres in the blastocyst are arranged into two layers, trophoblast and endometrium. (iv) Cleavage divisions result in a solid ball of cells called morula. Which two of the above statements are correct?
Solution
Cleavage divisions do not increase the total mass of protoplasm (the zygote's cytoplasm is simply partitioned among more and progressively smaller blastomeres), so (i) is false while (ii) is true; the blastocyst's two layers are the
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