A) centriole
B) nucleus
C) protein
D) mitochondria
Correct Answer: D
Solution :
A spermatozoan consist of anterior part head, a middle portion and terminal tail which is many times larger than the length of head and middle portions of sperms. Middle piece of a sperm is formed of mitochondrial spiral, nebenkern around the proximal part of axoneme. This middle piece is known as power house of sperm.
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