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Question

Foldings of the inner membrane of mitochondria are called

A
sacs
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B
cisternae
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C
cristae
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D
grana
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Solution

The correct option is C cristae
The mitochondria are double membrane-bound organelles involved in aerobic respiration. The mitochondrion is called the ‘powerhouse of the cell’, it is the site for the synthesis of energy in the form of ATP by breaking down food substances such as carbohydrates and fats.

The inner membrane of mitochondria forms a number of finger-like infoldings called the cristae. More the number and length of cristae, higher will be the respiratory activity of the mitochondria.

Cisternae are the flattened sacs of endoplasmic reticulum.

Grana are the pile-like structures composed of thylakoids arranged one above the other in the chloroplast.


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