Question

Match column I with column II and select the correct option from the codes given.

	Column I		Column II
A.	Cleavage	(i)	Fertilisation
B.	Morula	(ii)	Mitotic divisions
C.	Polyspermy	(iii)	Endometric
D.	Implantation	(iv)	Little mulberry

• A. A - (ii), B - (iv), C - (i), D - (iii)
• B. A - (i), B - (iv), C - (ii), D - (iii)
• C. A - (iv), B - (ii), C - (i), D - (iii)
• D. A - (ii), B - (iv), C - (iii), D - (i)

Answer 1

Answer: (A)

A - (ii), B - (iv), C - (i), D - (iii)

As the zygote moves through the isthmus of the oviduct mitotic divisions starts and is called cleavage. Morula is a ball like structure formed as a result of the 8 to 16 stage blastomere and looks like a little mulberry. The zona pellucida layer around the ovum induces changes in it and blocks the entry of additional sperms (polyspermy). The fertilization of the ovum by the sperm leads to the implantation of the zygote in the endometrium that lines the uterine cavity.

So, the correct option is 'A - (ii), B - (iv), C - (i), D - (iii)'.