NEETZoologyHuman Reproduction
Event Outcome A. Sperm capacitation 1. Prevention of polyspermy B. Acrosome reaction 2. Enzymatic breakdown of zona pellucida C. Fusion of sperm and egg membranes 3. Sperm gains ability to fertilize the egg D. Cortical reaction 4. Completion of meiosis II in the egg
Options
- AA -2 , B -4 , C - 3, D -1
- BA - 3, B - 2, C - 4, D - 1
- CA -1 , B - 3, C - 4, D -2
- DA -3 , B -1 , C -2 , D -4
Correct answer
B. A - 3, B - 2, C - 4, D - 1
Step-by-step solution
Sperm capacitation: Sperm gains the ability to fertilize the egg after undergoing physiological changes. Acrosome reaction: Enzymes are released to break down the zona pellucida surrounding the egg. Fusion of sperm and egg membranes: Triggers the completion of meiosis II in the egg. Cortical reaction: Prevents polyspermy by altering the egg's outer layer.