Given below is an example of a certain structure and its special functional activity:

chloroplasts and photosynthesis

In a similar way, write the functional activity against each of the following:

(a) Hydathodes and ……………

(b) Leaf spines and ……………

(c) Lenticels and ……………

(d) Xylem and ……………

State whether the following statements are True (T) or False (F)? Rewrite the false statements in the correct form.

(i) Most transpiration occurs at midnight.

(ii) Transpiration creates a pull for the upward movement of the sap.

(iii) Wind velocity has an effect on transpiration.

(iv) Atmospheric humidity promotes transpiration from a green plant.

(v) Transpiration helps to cool the body of the plant.

Name these:

(a) Three kinds of transpiration.

(b) Three external factors which increase the rate of transpiration.

(c) Three intrinsic features which reduce the rate of transpiration.

(d) Three extrinsic factors which decrease the rate of transpiration.

(e) Four kinds of potometers on the basis of the name of scientists who discovered them.

Define the following terms:

(a) Transpiration

(b) Exudation

(c) Potometer

(d) Wilting

(e) Hydathodes

(f) Cuticle