Question

The root hairs are suited for absorbing water from soil because :

• A. They have a large surface area
• B. They have a semi-permeable membrane
• C. They contain a solution of higher concentration than surrounding water
• D. All the three

Answer 1

The correct option is D

All the three

The correct option is D:

Explanation for Correct answer:

1. Root hairs are specialized cells whose main function is the absorption of water.
2. Each cell has a long, protruding extension on one side that extends into the soil.
3. The cell wall is permeable to all substances, that is, it allows all substances to pass through.
4. However, the cell membrane is semi-permeable and thus allows only some substances to pass through.
5. The cytoplasm of the cells has a higher concentration than the solution that surrounds the root.
6. This allows water from outside the root hair cells to move in through osmosis.

So, the root hairs are suited for absorbing water from soil because they have a large surface area, have a semi-permeable membrane, and contain a solution of higher concentration than the surrounding water.