Question

The alongside diagram A shows a root hair growing through the soil particles. The diagram B is the root hair of an aquatic plant.

(i) Name the parts 1,2,3.

(ii) Name two substance s which enter the root hair. What are their uses ?

(iii) By what process do these substances enter the root hair ?

(iv) Account for the different shapes of root hairs in the two diagrams.

Answer 1

(i) 1-Nucleus. 2-Cell wall. 3-Cytoplasm of the root hair cell.

(ii) 1. Water: Carries minerals to the plant.

2. Minerals : They are needed for healthy p lant growth.

(iii) Osmosis.

(iv) In the Fig . A, the root hair has to pass through the soil particles and as such they are not straight. In Fig. B, the root hair has no obstruction in water, and as such it grows straight.