Question

The growth of pollen tubes towards ovules is due to

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

Answer 1

The correct option is B

Chemotropism

The correct option is B:

Explanation of the correct option:

• The growth of the pollen tube towards the ovules occurs through chemotropism.
• The ovules produce the nutrients and chemicals required for the growth of pollen tubes and provide a directional passage for them.

Explanation of the incorrect options:

Option A:

• The pollen tubes do not grow towards a water source; therefore, their growth is not due to hydrotropism.

Option C:

• Geotropism occurs due to gravitational pull, but the growth of a pollen tube occurs due to a chemical stimulus.

Option D:

• The growth of a pollen tube occurs towards the ovule due to a chemical stimulus released by ovules. It does not grow towards the light source.

Final Answer: Therefore, the growth of the pollen tube occurs due to chemotropism.