Question

Intensely lactating mothers do not generally conceive due to the
A. Suppression of gonadotropins
B. Hyper secretion of gonadotropins
C. Suppression of gametic transport
D. Suppression of fertilization

Answer 1

Hint: Intensely lactating mothers generally won't conceive till six month after the postpartum. Because all hormones in the body change during pregnancy so it is not possible for the next conception until all hormones are working or secreting properly. If the mother is regularly breast feeding then they didn't conceive. So the chance of getting pregnant is reduced. No ovulation process occurs during breastfeeding.

Complete answer:
Option A: Gonadotropins are the peptide hormones that regulate the ovarian and testicular function. It is essential for normal growth, sexual growth and reproduction. This hormone suppresses the ovulation by stopping the production of estrogen and progesterone. If the hormone is released then fertilization is possible. Otherwise, there is no possibility of pregnancy. During the lactating process gonadotropins are in a suppressed condition. Option A is correct.
Option B: Over production of gonadotropins will cause the failure of the negative feedback loop. Overproduction of this hormone is due to the castration or ovarian removal. Over secretion will be caused by gonadal failure or the presence of a pituitary tumor. Hyper secretion may damage the hypothalamus of the brain and halt the function of the brain. Option B is incorrect.
Option C: Fertilization occurs at the ampullary region of the oviduct. Sperms are transferred to the vagina of a female. Due to the suppression of gametic transport, pregnancy does not occur for not only the lactating women but also the normal women. Option C is incorrect.
Option D: Suppression of fertilization will result in contraception. If ovulation does not occur then there is no releasing of egg or no possibility of pregnancy. So suppression of fertilization is the normal one every woman has, not the breastfeeding woman. Option D is incorrect.

Hence, Option A is the correct answer.

Note:
Breast feeding women's bodies have prolactin and oxytocin hormone. Other hormones like estrogen are involved indirectly in the lactation process. During the baby suckles the nipples, then sensory impulses pass from the breast to brain. Prolactin hormone is the reason for lactation and it gives calm and relaxation during breastfeeding. So the higher level of prolactin production will reduce the production of sex hormones like estrogen and testosterone. So the breast feeding women cannot conceive.