A cross section at the midpoint of the middle piece of a human sperm will show

centriole, mitochondria and 9 + 2 arrangement of microtubules

centriole and mitochondria

mitochondria and 9 + 2 arrangement of microtubules

9 + 2 arrangement of microtubules only

Solution

centriole, mitochondria and 9 + 2 arrangement of microtubules

Sperm consists of head, neck, a middle piece and a tail.

When viewed under electron microscope, cross- section of a midpiece of sperm consists of-

(i) core of the flagellum is composed of an axoneme surrounded by 9 dense fibres.

(ii) axoneme consists of 2 singlet microtubules surrounded by 9 microtubule doublets.

(iii) mitochondria is well placed for providing the ATP required for flagellar movement.

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