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When a part of these 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 thigmonasty.
Plants take in carbon dioxide to perform cellular respiration.
The movement or growth of a plant towards the direction of light is known as phototropism. The solar tracking of sunflower in accordance with the path of sun is due to phototropism.
The phenomenon of tropism is classified into various types based on the direction of the stimuli.
If the growth is away from the signal tropism is considered as positive. Hence the growth of the root of a plant is considered to be negatively geotropic.
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