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Assertion (A): Iodine solution makes the nucleus more distinct. Reason (R): Nucleus contains starch which becomes blue-black upon absorbing the iodine solution.

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Question

Assertion (A): Iodine solution makes the nucleus more distinct.

Reason (R): Nucleus contains starch which becomes blue-black upon absorbing the iodine solution.

Options

  • A is True and R is False.

  • A is False and R is True.

  • Both A and R are True.

  • Both A and R are False.

MCQ
Assertion and Reasoning
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Solution

Both A and R are True.

Explanation:

A is true. Iodine is a stain that improves the visibility of cell features, particularly the nucleus. R is false. The nucleus does not contain starch. The blue-black reaction involves starch, not the nucleus.

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Chapter 1: Cell: The structural and functional unit of life - Review Questions [Page 7]

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Selina Concise Biology [English] Class 10 ICSE
Chapter 1 Cell: The structural and functional unit of life
Review Questions | Q 3. | Page 7
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