1. What is (i) phototropism and (ii) geotropism? With labelled diagrams, describe an activity to show that light and gravity change the direction that plant parts grow in.
2. Mention the role of each of the following plant hormones: (i) Auxin and (ii) Abscisic acid

(a)

(i) Phototropism is the growth of plant parts in response to a light stimulus, and 

(ii) Geotropism is the movement or growth of plant parts in response to the force of gravity. 

(b)

(i) Auxin: Auxin is present at the tip of the shoot, is responsible for the phenomenon of phototropism in plants.

(ii) Abscisic acid is a plant growth inhibitor hormone that promotes the wilting and falling of leaves.