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ICSE Class 10 Biology Question 1 of 5

Cell — The Structural and Functional Unit of Life — Question 3

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Question

Question 3

Assertion. Iodine solution makes the nucleus more distinct.

Reason. Nucleus contains starch which becomes blue-black upon absorbing the iodine solution.

  1. Both A and R are True.
  2. Both A and R are False.
  3. A is True and R is False.
  4. A is False and R is True.
Answer

A is True and R is False

Explanation
Iodine solution is a common stain used in microscopy to enhance the visibility of certain cellular structures, including the nucleus.
The enhanced visibility of the nucleus with iodine staining is not due to the presence of starch. Instead, iodine binds to various cellular components, including nucleic acids, making the nucleus more visible under a microscope.