What are tropic movements or tropism in plants? [2 Marks]

A tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.
[1 Mark]
Tropisms are directional movement responses that occur in response to a directional stimulus.
[0.5 Marks]
Positive tropism = the plant, or a part of it, grows in the direction from which the stimulus originates.
Negative tropism = growth away from the stimulus.
[0.5 Marks]