Question

The hormones, that maintains the secretory activity of the corpus luteum and increase in the size of the mammary glands are
(A Estrogen
(B) Luteinizing
(C) Luteotrophin
(D) Gonadotrophin
(E) Both B and C

Answer 1

Hint: Gonadotropin is a board term. Oestrogen is released from graafian follicle and luteotropic hormone is also called prolactin. Now, it is very easy to answer the question.

Complete answer: Progesterone is a steroid hormone that is secreted from the corpus luteum. It prolongs the secretion of prolactin.
1. Luteinizing hormone is a hormone that is produced by gonadotropic cells of the anterior pituitary gland. In females, an acute rise of LH triggers the ovulation and development of the corpus luteum. It also helps in the secretion of progesterone. It also helps in the growth of the mammary gland.
2. Estrogen is also a steroid hormone that is secreted as a result of gonadotropin secretion from pituitary gland. Estrogen is secreted by graafian follicles.
The estrogen and progesterone help in the menstrual cycle and maintains pregnancy.
3. The prolactin is very much essential for milk production. It is also called lactotroph hormone or luteotropic hormone. Prolactin is a gonadotropic hormone that is protein in nature and secreted by the pituitary gland.
4. The estrogen and progesterone are synthesized from cholesterol.

So, here the correct answer is option B. Luteinizing hormone.90

Note: Do not get confused between the function of prolactin and luteinizing hormone (LH). The former helps in milk production and the later helps in the growth of mammary glands. Gonadotrophic hormone is the combination of FSH (Follicle stimulating hormone) and LH. The FSH helps in the development of graafian follicle.