Question

Match column-I with column-II and select the correct answer using the codes given below.

	Column I		Column II
A.	Hypothalamus	I.	Sperm lysins
B.	Acrosome	II.	Oestrogen
C.	Graafian follicle	III.	Relaxin
D.	Leydig cells	IV.	GnRH
E.	Parturition	V.	Testosterone

A. A-IV;B-I;C-II;D-III;E-V
B. A-II;B-I;C-IV;D-III;E-V
C. A-II;B-I;C-V;D-IV;E-III
D. A-IV;B-I;C-II;D-V;E-III

Answer 1

Hint: The hypothalamus is a small but significant area in the centre of the brain. The acrosome is a unique membranous organelle positioned above the anterior part of the sperm nucleus that is extremely preserved throughout evolution. A Graafian follicle is a fully matured follicle, which breaks down and releases the ovum during an ovulatory phase. Leydig cells are the main source of androgens or testosterone in males. Parturition signifies childbirth.

Complete step-by-step answer:
A hormone created by a portion of the brain referred to as a hypothalamus. The gonadotropin-releasing hormone causes the pituitary gland in the brain to perform and secrete the hormones like follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
Sperm lysin aids the sperm to penetrate through the egg membrane. The acrosome secretes the sperm lysin.
During the follicular phase, the body secretes follicle-stimulating hormones inducing the production of ovarian follicles containing eggs. One of these follicles will develop into a mature follicle capable of being fertilised, which is called the dominant follicle which secretes oestrogen. It breaks the non-dominant follicles and accelerates the thickening of the uterus for implantation.
Foetal Leydig cells generate high levels of androgen (androstenedione or testosterone, depending upon the species) necessary for the difference of the male genitalia and for brain masculinization.
Relaxin is a polypeptide hormone generated in the human female by the corpus luteum of pregnancy and the decidua. In the male, it is generated in the prostate and occurs in human semen. It performs a paracrine role in humans and hence peripheral serum levels may not always reflect its activity.

	Column-I		Column-II
A.	Hypothalamus	I.	GnRH
B.	Acrosome	II.	Sperm lysins
C.	Graafian follicle	III.	Oestrogen
D.	Leydig cells	IV.	Testosterone
E.	Parturition	V.	Relaxin

Therefore the correct answer is Option D.
Note: Leydig cells are also known as interstitial cells. During the parturition process, the cervix enlarges and relaxes. Along with cortisol, oxytocin and oestrogen hormones are released to start milk production as well as labour. The Graafian follicle is encircled by a layer of follicular cells, which remain with the oocyte following ovulation. In mammalian fertilisation, acrosin and hyaluronidase are the two enzymes released by the sperm and together are referred to as sperm lysin. Gonadotropin hormone-releasing hormone (GnRH) is the key controller of the reproductive axis.