Question

Root hair is extension of

• A. Outer epidermal cells of root
• B. Inner epidermal cells of root
• C. Vacuoles of root
• D. All of the above

Answer 1

The correct option is A

Outer epidermal cells of root

The correct option is A.
Explanation for the correct option:

1. The outer epidermal cells of the root's root are what grow as the root hairs.
2. They have huge vacuoles with cell sap inside of them.
3. When compared to the nearby subsurface water, the salt content of the cell sap is higher.
4. Osmosis is a process that draws water into the root hair as a result of this feature.
5. Trichoblasts are the epidermal cells of roots that are capable of producing root hairs, whereas atrichoblasts are epidermal cells incapable of producing root hairs.

Explanations for the incorrect options:
Option B:

1. Root hair, also known as absorbent hair, are specialised cells at the tip of plant roots called epidermal cells.
2. They are rarely branched and are simply lateral extensions of a single cell.
3. They are located in the root's maturation area.
4. Between the plant and the surrounding environment, it creates a barrier.
5. The epidermis performs several tasks, including preventing water loss, controlling gas exchange, secreting metabolic chemicals, and absorbing water and mineral nutrients (particularly in roots).

Option C:

1. The outer epidermal cells of the root's root are what grow as the root hairs.
2. A zone of elongation that is functionally associated with vacuolar expansion follows a zone of meristem whose cells have no or few tiny vacuoles at the distal end of the root.
3. Salts, minerals, colours, and proteins are kept in a vacuole within the cell.
4. The cell sap is the liquid that fills a vacuole.
5. Protons from the cytosol are also present in the vacuole, aiding in the maintenance of an acidic environment inside the cell.
6. The vacuoles are also where a lot of lipids are kept.

Final answer: Root hair is an extension of the outer epidermal cells of the root.