- 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.
- 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.
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(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.
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