Multiple choice

Which of the following statements is incorrect?

  1. An embryo with 8 to 16 blastomeres is called a morula.

  2. A morula continues to divide and transforms into blastocyst.

  3. The size of each cell of a morula is equal to a zygote.

  4. Blastocyst has a fluid-filled cavity.

  5. An inner group of cells attached to trophoblast is called the inner cell mass.
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C Correct answer
Explanation

The morula, a collection of around 30 cells (blastomere), is created at about 96 hours. Because these cells arise only through the cleavage of the zygote and all are found inside the pellucid zone, which cannot expand, no growth is seen. Every new cell is thus only half as large as the cell from which it derives.

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