Mitochondria — task. Biology CBSE Live product, Class 9 (2025-26).

Choose the best answer:

1. Statement I: Mitochondria were first observed by Kolliker in 1880.

Statement II: The size of mitochondria usually ranges from 0.5 to 1.0 µm in diameter.

Statement I is correct, but statement II is incorrect
Both statements I and II are correct
Statement I is incorrect, but statement II is correct
Both statements I and II are incorrect

2. Which of the following statements about mitochondrial membranes is incorrect?

The outer and inner membranes are separated by the intermembrane space
Both membranes are made only of proteins, without phospholipids
The inner membrane is deeply folded into cristae and contains F1 particles
The outer membrane has proteins called porins that allow free movement of ions

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2. Mitochondria

Question: