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.

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

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