Class 9 · Science · Exploration

2. Cell: The Building Block of Life

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Cells were first observed in cork by

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Answer and explanation

Answer: A. Robert Hooke

Robert Hooke saw box-like cells in cork in 1665.

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Try question 2

Which organelle is called the powerhouse of the cell?

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Answer and explanation

Answer: B. Mitochondrion

Mitochondria release energy from food as ATP.

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Try question 3

The plant cell wall is mainly made of

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Answer and explanation

Answer: A. cellulose

Cellulose gives plant cells strength and shape.

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