Question

Cell walls of root hairs for absorbing must be

• A. Hydrophobic
• B. Permeable
• C. Semipermeable
• D. Impermeable

Answer 1

Answer: (B)

Permeable

Permeable wall or membrane means, it can allow solvent and all the solutes to pass through. Impermeable means a wall or membrane that does not allow any solvent or solute to pass through, while semipermeable wall or membrane will freely allow solvent but selected solute particles to pass through. The cell wall in plants is freely permeable, i.e., allows free movement of both solute and solvent particles, because it is dead at maturity. The cell walls of root hairs have permeable walls to allow for free absorption of water and solutes.

So, the correct answer is option B.