Question

Which of the following is not true for the cleavage in human zygote?

• A. The number of cells increase by mitotic division.
• B. The embryo size goes on increasing with every cleavage.
• C. The volume of cytoplasm of each cell decreases with every cleavage.
• D. The cleavage starts when the egg is in the fallopian tube.

Answer 1

Answer: (B)

The embryo size goes on increasing with every cleavage.

The number of the cells in the fertilized egg cell divides by mitosis and increases in number.

The size of the embryo remains same and the number of the cells increases with every cleavage.

The volume of the cytoplasm goes on decreasing due to the formation of new cells during cleavage.

The fertilization of the egg takes place in the fallopian tube and the cleavage starts after fertilization in the fallopian tube itself.

Thus, the correct answer is option B.