Step 1: Understanding the Problem:
A mature human spermatozoon is a highly specialized cell composed of four distinct regions: head, neck, middle piece, and tail. Each region hosts specific structures crucial for reproduction. Step 2: Approach and Formula:
Match the distinct anatomical regions of a human sperm with their specific cellular components and their corresponding physiological functions. Step 3: Detailed Explanation:
Let's match each component logically:
- a) Acrosome: Located at the anterior tip of the sperm head. It contains hydrolytic enzymes (like hyaluronidase) essential for breaking down the ovum's coverings during fertilization. (a $\rightarrow$ iii)
- b) Head: The main bulky part of the sperm. It houses the genetic material in the form of an elongated haploid nucleus. (b $\rightarrow$ iv)
- c) Middle piece: This region is packed with numerous mitochondria. They act as powerhouses, generating ATP energy to fuel the sperm's movement. (c $\rightarrow$ i)
- d) Tail: A long flagellum that produces a whip-like motion, facilitating the motility of the sperm through the female reproductive tract. (d $\rightarrow$ ii)
Combining these pairs yields: a - iii, b - iv, c - i, d - ii. Step 4: Final Answer:
The correct matching sequence is (D).
