Since corpus luteum degenerates so progesterone also decreases rapidly (progesterone is essential for maintenance of pregnancy). Also estrogen continues to curve growth of the endometrium which ultimately becomes thick enough to break down and cause menstruation. Hence choice (c) is incorrect as estrogen secretion does not decreases further. Primary follicles start developing.

Correct Option: C

Since corpus luteum degenerates so progesterone also decreases rapidly (progesterone is essential for maintenance of pregnancy). Also estrogen continues to curve growth of the endometrium which ultimately becomes thick enough to break down and cause menstruation. Hence choice (c) is incorrect as estrogen secretion does not decreases further. Primary follicles start developing.

After ovulation ovarian follicle, undergo several stages of degeneration. The follicular cells enlarge and fill with a yellow fluid to form corpus luteum.

Correct Option: A

After ovulation ovarian follicle, undergo several stages of degeneration. The follicular cells enlarge and fill with a yellow fluid to form corpus luteum.

Luteinizing hormone causes ovulation. The remaining cells of ovarian follicle are stimulated by LH to develop corpus luteum.

Correct Option: C

Luteinizing hormone causes ovulation. The remaining cells of ovarian follicle are stimulated by LH to develop corpus luteum.

Ectoderm produces – Liver, Epidermis, glands, hair, nervous system etc. Endoderm produces – Pancreas, lining of urinary bladder etc. Mesoderm produces – Dermis, most muscles, Kidneys, Gonads etc.

Correct Option: C

Ectoderm produces – Liver, Epidermis, glands, hair, nervous system etc. Endoderm produces – Pancreas, lining of urinary bladder etc. Mesoderm produces – Dermis, most muscles, Kidneys, Gonads etc.

A glycoprotein fertilizin (composed of monosaccharides and amino acids) is secreted by a mature egg. Penetrating sperm also has some proteinaceous substance on its surface called antifertilizin. Due to the interaction between fertilizin & antifertilizin, the sperm adheres to the egg.

Correct Option: B

A glycoprotein fertilizin (composed of monosaccharides and amino acids) is secreted by a mature egg. Penetrating sperm also has some proteinaceous substance on its surface called antifertilizin. Due to the interaction between fertilizin & antifertilizin, the sperm adheres to the egg.