The leaves of a sensitive plant close whenever any part of the leaf is touched because of a
a. gravitropism.
b. phototropism.
c. thigmotropism.
d. photoperiodism

The correct answer is C. Thigmotropims

Explanation:

In biology, the term "thigmotropism" describes a natural response by some plants as they have contact with an object or body. In this way, the leaves of a plant move towards the object they had physical contact or growth in this direction, also it is common some leaves close or attach to an object they had contact with. A simple example of this is climbing plants that grow over specific surfaces and have specialized structures to attach to the surface or objects near to them. Therefore, it is because of thigmotropism leaves fo a sensitive plant close whenever any part of the leaf is touched.

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