Question

Auxins help cell to grow longer when growing plant detects

• A. smell.
• B. light.
• C. temperature.
• D. chemicals.

Answer 1

The correct option is B

light.

The correct option is B.

Explanation for correct option-

1. Auxin is a chemical substance known to promote plant roots and shoot growth.
2. Phototropic growth in plants is caused by auxin.
3. The amount of auxin present on the darker side of the shoot is more than on the bright side. This causes the bending of the stem towards the light source when auxin promotes cell growth in the stem.

Explanation for incorrect options-

Option A:

• Auxin does not respond to the stimulus of smell.

Option C:

• Auxin does not respond to the stimulus of temperature.

Option D:

• Auxin does not promote any changes in the plant body in response to chemicals.

Final Answer: Auxins help cells grow longer when a plant cell detects light.