Question

Which of the following two hormones are essential for the induced breeding of fishes?
a) TSH and ACTH
b) Oestrogen and progesterone
c) FSH and LH
d) Vasopressin and oxytocin

Answer 1

Hormones stimulate the reproductive organs to produce other hormones that are responsible for secondary sexual characters.

Complete answer: Hormones are chemical substances which are secreted in small quantities, and have a specific function, and are released directly into the bloodstream, thus reach the target organ.
A. ACTH (Adrenocorticotropic hormone) stimulates the adrenal gland to produce a hormone called cortisol. TSH stimulates the thyroid gland to secrete its own hormone called thyroxine.
B. Oestrogen and Progesterone are female sex hormones. Oestrogen is the hormone responsible for the menstrual cycle while progesterone is the hormone that supports a pregnancy. During pregnancy, they work together and are responsible for the changes that occur in the female body due to pregnancy.
C. FSH (follicle-stimulating hormone) and LH (luteinizing hormone) are correlated with the cycles of gonadal maturity. FSH is mostly involved in promoting early gonadal development and growth whereas LH plays an important role in the final gamete maturation and responsible for ovulation and termination.
D. Vasopressin and Oxytocin are peptide hormones found in mammals that have vital physiological and behavioral action, that are mediated through both peripheral and central mechanisms, including regulating fluid homeostasis and blood pressure.
Therefore, FSH and LH are the only two hormones that are responsible for the breeding of fishes.
Thus, the correct answer is an option (C). FSH and LH

Note: Induced breeding is a technique by which the economically important fish are bred through artificial stimulation of pituitary injection.