Question

Match the following with correct combination.

Column 1	Column 2
A. Hyaluronidase	1. Acrosomal reaction
B. Corpus luteum	2. Morphogenetic movements
C. Gastrulation	3. Progesterone
D. Capacitation	4. Mammary gland
E. Colostrum	5. Sperm activation

• A. A- 3, B- 2, C- 4, D- 1, E- 5
• B. A- 1, B- 3, C- 2, D- 5, E- 4
• C. A- 3, B- 2, C- 5, D- 4, E- 1
• D. A- 1, B- 2, C- 3, D- 4, E- 5
• E. A- 4, B- 2, C- 5, D- 3, E- 1

Answer 1

Answer: (B)

A- 1, B- 3, C- 2, D- 5, E- 4

During fertilization, binding of sperm head to zona pellucida of the egg is followed by the release of digesting enzyme, hyaluronidase that makes a passage for entry of sperm through zona pellucida. This is known as an acrosomal reaction. LH stimulates the formation of corpus luteum from ovulated Graafian follicle which in turn secretes progesterone and estrogens. If fertilization occurs, corpus luteum is maintained to secrete progesterone which in turn serves to maintain endometrium to facilitate nutrition of developing embryo. In absence of fertilization, negative feedback control of higher progesterone level over the anterior pituitary’s secretion of LH causes degeneration of corpus luteum in the ovary within 10 days of its formation. The resulting lowered progesterone level causes disintegration of endometrium thereby initiating the next menstrual cycle. Morphogenesis refers to the shaping of the embryo by migration/movement of certain cells in relation to other cells. Differentiation of inner cell mass of blastula into the embryonic disc is followed by formation of three germ layers (ectoderm, mesoderm and endoderm) to form gastrula stage of embryonic development. It occurs by movement of blastomeres from blastula surface to proper position in gastrula. Acquisition of ability to fertilize ovum is called capacitating of sperm which occurs after its entry in female reproductive tract. Colostrum is the first secretion by breast after childbirth, it is thin, yellow, milky fluid rich in proteins and antibodies, particularly IgA. Therefore, the correct answer is option B.