Question

Identify the type of tropic movement that is responsible for the movement of the pollen tube towards an ovule from the following options.

Options

• Hydrotropism

• Geotropism

• Chemotropism

• Phototropism

Answer 1

Chemotropism

Explanation:

Chemotropism is the directional growth movement of a plant part in response to a chemical stimulus. The growth of a pollen tube towards an ovule is a classic example of this movement because it is guided by chemical secretions (such as sugars and calcium gradients) released by the ovule and surrounding tissues. This ensures that the male gametes are accurately delivered to the female gamete for fertilisation.