(a) 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.
(b) Mention the role of each of the following plant hormones:
(i) Auxin
(ii) Abscisic acid
Answers
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Plant growth
Explanation:
Phototropism is the term given for the movement of a plant towards the direction of light.
Example: Movement of plant's shoot towards the sunlight.
Geotropism is the term given for the movement of a plant toward or away from gravity.
Example: Roots move towards gravity, while the stem grows away from gravity in the opposite direction.
Auxin is the plant hormone that helps phototropism. So the plant actually grows in the direction where auxin is more concentrated, thus moving towards light as Auxin is concentrated in the regions that receive light directly.
Abscisic acid is a plant hormone that controls many developmental processes in plants, including seed and bud dormancy, the control of organ size and stomatal closure.