given below are four statements (i)-(iv) reagarding embryonic development in humans.
(i). Cleavage divisions about considerable increase I the mass of protoplasm
(ii). With more cleavage divisions, the resultant blatomeres 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 of the above two statemetns are correct?

Options

A. (i) and (iii)
B. (ii) and (iv)
C. (i) and (ii)
D. (iii) and (iv)

Answer

B

Explanation

Interphase in cleavage division is short and does not involve growth so that the resulting blastomeres become smaller in size as their number increase. During cleavage, at smaller in size as their number increases. During cleavage, at 8-16 celled stage. a solid ball of cells called morula (As it look like mulberry) is formed. In cleavage. there is increased mobility of protoplasm. The blastomeres in the blastocyst get arranged into outer layer called trophoblast and an inner group of cells attached to trophoblast called the inner cell mass.