Biology
Assertion. Iodine solution makes the nucleus more distinct.
Reason. Nucleus contains starch which becomes blue-black upon absorbing the iodine solution.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- 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.
Related Questions
Assertion. Human red blood cells are circular and biconcave.
Reason. This shape prevents the easy passage of these cells through blood capillaries.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. Nucleolus does not produce ribosomes.
Reason. Nucleolus participates in protein synthesis by forming and storing R.N.A.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. Cell membrane is freely permeable.
Reason. Cell membrane permits free movement of the solutions across the membrane when two solutions of different tonicity are separated through it.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. Scattered Golgi body in animal cells are called as 'dictyosomes'.
Reason. Plant cells have dictyosomes because the entire central space is occupied by a large vacuole.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.