Question

Growth of pollen tube towards ovule is called

• A. Phototropism
• B. Geotropism
• C. Hydrotropism
• D. Chemotropism

Answer 1

The correct option is D

Chemotropism

The correct option is D

Explanation of the correct option:

1. The movement of a plant or its parts in response to chemical stimuli is called chemotropism.
2. When a pollen grain comes in contact with the stigma, the ovary produces a positive chemical response for the pollen grain.
3. This helps the pollen tube to grow towards the ovary for the process of fertilization.

Explanation of the incorrect options:

Option A

Phototropism is the ability of a plant to grow either by responding to the source of light or growing away from the source of light.

Option B

The growth of the parts of plants in response to the force of gravity is called geotropism.

Option C

Hydrotropism is the process where the growth or movement of plants is towards water or environmental moisture.

Final answer: Growth of pollen tube towards ovule is called Phototropism.