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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.
The leaves of green plants have tiny, microscopic pores known as lenticels that play a prominent role in transpiration.
The process of tropism can be considered as positive or negative based on the types of stimulus involved.
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 phenomenon of tropism is classified into various types based on the direction of the stimuli.
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