Question

The figure given below is a diagrammatic representation of a part of the cross-section of the root in the root hair zone. Study the same and then answer the questions that follow :

(i) Name the parts indicated by guidelines ‘1’ to ‘5’

(ii) Is the root hair cell unicellular or multi-cellular ?

(iii) Draw a labeled diagram of the root hair cell as it would appear if some fertilizer is added to the soil close to it.

(iv) Name the process responsible for the entry of water molecules from the soil into A₁ and then A₂.

(v) What pressure is responsible for the movement of water in the direction indicated by arrows ?

(vi) How is this pressure set up ?

Answer 1

(i) 1. Vacuole (containing cell sap)

2. Soil particles

3. Xylem vessel

4. Cortex cells

5. Vacuole in cortical cells

(ii) Root hair cell is unicell ular

(iii) See diagram alongside.

(iv) Osmosis

(v) Osmotic pressure

(vi) This pressure is set up due to difference in osmotic gradient.