The growth of pollen tube toward the ovule is an example of (A) Phototropism (B) Hydrotropism (C) Thigmotropism (D) Chemotropism

Chemotropism

The growth of a plant part due to chemical stimulus is known as chemotropism or Chemotropism is the movement of a part of the plant in response to a chemical stimulus. The growth of pollen tube towards the ovule induced by a sugary substance as stimulus. This is an example of positive chemotropism.

Therefore, the correct option is (D)

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