Q. Assertion : The middle piece is called as power house, of the sperm.
Reason : The numerous mitochondria coiling around axial filament produce energy for the movement of the tail.

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Solution:

The middle piece of human sperm contains the mitochondria coiled around the axial filament called, mitochondrial spiral. They provide energy for the movement of the sperm. So it is called as the 'power house of the sperm'.