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

Reason (R): 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.

Assertion (A): Cell membrane is freely permeable.

Reason (R): Cell membrane permits free movement of the solutions across the membrane when two solutions of different tonicity are separated through it.

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.

Assertion (A): The basic structural unit of DNA is nucleotide.

Reason (R): DNA is composed of repeating nucleosome which are made up of three components - pentose sugar, phosphate group and nitrogenous bases.

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.

Assertion (A): Centrosome is the point of attachment of two chromatids of a chromosome.

Reason (R): Centrosome initiates and regulates the process of cell division as it helps in the formation of spindle fibres.

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.