(a) List five morphological features that are characteristic of plant found in each of the following habitats:-(i) tropical rainforest. (ii) savanna. In each case, state function of the features listed in (a) to the plant.

(b) Explain the term: ecological succession

(c) By means of a diagram only, outline the carbon cycle to show the relative importance of the cycle to life in general.
 

(a) Describe an experiment to demonstrate the influence of auxins on the growth of plant shoot.

(b) List three uses of auxins in agriculture.

(c) Describe briefly the mechanism of transmission of impulses through a nerve fibre.