Always look for high-yield pairings first to eliminate incorrect options rapidly.
For instance, linking Sertoli cells to FSH inhibition or Hyaluronidase to the corona radiata instantly narrows down the choices.
Step 1: Understanding the Question:
The question requires us to match several items related to human reproduction and reproductive endocrinology from List-I with their respective physiological roles or markers in List-II.
Step 2: Key Concept and Approach:
We will analyze each biological entity in List-I and identify its standard functional partner in List-II.
Hyaluronidase is a critical hydrolytic enzyme found in the acrosome of mature spermatozoa.
The ovulatory phase is defined by the rupture of the Graafian follicle, which is triggered by a sudden surge in LH.
Sertoli cells play a regulatory feedback role in spermatogenesis by secreting inhibin, which acts on the pituitary gland.
Estradiol is the primary estrogenic hormone in females, responsible for promoting growth of female reproductive organs.
Step 3: Detailed Explanation:
• A. Hyaluronidase -- II. Corona radiata penetrating enzyme: During fertilization, the sperm must penetrate the follicle cells surrounding the ovum.
Hyaluronidase is released to break down the hyaluronic acid in the extracellular matrix of the corona radiata.
• B. Ovulatory phase -- IV. LH surge: The release of the secondary oocyte from the ovary is triggered by a rapid, high-concentration release of luteinizing hormone on day 14.
This physiological phenomenon is known as the LH surge.
• C. Sertoli cells -- I. Inhibits the secretion of FSH: Sertoli cells provide nourishment to developing spermatids and secrete a glycoprotein hormone called inhibin.
Inhibin provides a negative feedback signal directly to the anterior pituitary, inhibiting the release of follicle-stimulating hormone (FSH).
• D. Estradiol -- III. Promote growth of uterus and mammary glands: Estradiol is a steroid hormone that stimulates proliferation of the uterine endometrium and breast tissue development.
Step 4: Final Answer:
Matching these elements correctly gives: A-II, B-IV, C-I, D-III, which corresponds directly to Option (D).
