Which diagram shows fertilisation?
▶️ Answer/Explanation
Ans: C
Fertilisation is the fusion of a sperm nucleus (male gamete) with an egg nucleus (female gamete) to form a zygote. Diagram C correctly depicts this process, showing the sperm penetrating the egg.
Option A shows ovulation (egg release), B shows implantation, and D shows sperm production. Only C represents the actual moment of fertilisation where genetic material combines.
What is the function of the acrosome in a sperm cell?
A) The acrosome contains enzymes that digest the jelly coat of an egg cell.
B) The acrosome is needed for the sperm cell to move.
C) The acrosome releases energy.
D) The acrosome stores genetic information.
▶️ Answer/Explanation
Ans: A
The acrosome is a cap-like structure at the sperm’s head, containing digestive enzymes (e.g., hyaluronidase). Its primary function is to break down the egg’s protective layers (jelly coat and zona pellucida), enabling fertilization.
Option B is incorrect (movement is facilitated by the tail/flagellum). Option C is false (mitochondria release energy). Option D is incorrect (genetic material is in the nucleus). Thus, A is the correct answer.