Question

Correct sequence of events in mammalian fertilisation:

• A. A, B, C, D and E
• B. B, E, C, A and D
• C. E, B, A, C and D
• D. D, C, A, E and B

Hint:

Sperm must “Wake up” (B), “Knock” (E), “React” (C), “Enter” (A), and “Merge” (D).

Answer 1

The Correct Option is B

Step 1: Concept
Fertilisation involves a series of biochemical and physical interactions between sperm and egg. Step 2--3: Analysis
Sperm is capacitated in the female tract (B). Sperm binds the zona pellucida (E). The acrosomal reaction occurs (C). Sperm penetrates the zona (A). Sperm and egg membranes fuse (D).

Step 4: Conclusion
The order is B $\to$ E $\to$ C $\to$ A $\to$ D.

Final Answer: (B)