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NEETZoologyHuman Reproduction

Select the correct statement regarding the stages of early embryonic development:

Options

  1. AThe morula is formed after the blastocyst stage.
  2. BThe blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of ce
  3. CImplantation occurs when the morula embeds into the uterine wall.
  4. DThe inner cell mass of the morula forms the placenta.

Correct answer

B. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of ce

Step-by-step solution

A is incorrect. The morula continues to divide and transform into blastocyst. B is correct.The blastocyst stage is characterized by a fluid-filled cavity called the blastocoel. C is incorrect. The trophoblast layer then gets attached to the endometrium and the inner cell mass gets differentiated as the embryo. After attachment, the uterine cells divide rapidly and cover the blastocyst. As a result, the blastocyst becomes embedded in the endometrium of the uterus. D is incorrect. The inner cell mass gets differentia

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