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Ipomea alba opens in the day and closes during the night.
The movement of a plant in response to gravity is known as geonasty.
If the growth is towards the signal, tropism is considered as negative. Hence the growth of the shoot of a plant is considered to be negative phototrophic.
When a part of the climbers (tendrils) come in contact with the support it starts to grow in a faster rate than the other parts thus moving towards the direction of the stimulus. This is due to thigmotropism.
The unidirectional movement or growth of a whole part of a plant towards the direction of stimuli are known as nastic movements.
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