Question

What Is chemtropism?illustrate with an example

Answer 1

Explanation:

Thigmotropism is the directional response of a plant organ to touch or physical contact with a solid object. This directional response is generally caused by the induction of some pattern of differential growth. This phenomenon is clearly illustrated by the climbing tendrils of some plants, such as the sweet pea. The tendrils actually "feel" the solid object, which results in the coiling response. An example of such a response is illustrated below:

For example, human skin can minimally detect a thread weighing 0.002mg being drawn across it. However, a feeding tentacle of the insectivorous sundew plant responds to a thread of 0.0008mg, and a climbing tendril of Sicyos actually repsonds to a thread weighing just 0.00025mg! Therefore, some plants have a sense of touch which is nearly 10 times as sensitive as human skin!

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