Concept:The part labelled II in the human sperm diagram is the middle piece, which produces energy for sperm movement.
Explanation:A human sperm consists of a head, a middle piece, and a tail.
The head contains the nucleus and acrosome, which help the sperm to penetrate and fertilize the ovum.
The tail is responsible for propelling the sperm forward.
The part labelled II is the middle piece.
This region is packed with many mitochondria.
Mitochondria carry out cellular respiration to generate ATP energy.
This ATP energy is used by the tail to beat and move.
As a result, the sperm can swim through the female reproductive tract and reach the fallopian tube.
Option A is incorrect because fusion with the ovum is done by the head region.
Option C is incorrect because swimming forward is carried out by the tail.
Option D is incorrect because dissolving the egg membrane is the role of the acrosome in the head.
Thus, the middle piece is essential for supplying energy for the sperm's journey.
Answer:B. generate the energy for the sperm to swim to the fallopian tube
