Question

Directional movement of the plant in response to contact is called

• A. hydrotropism
• B. thigmotropism
• C. phototropism
• D. chemotropism

Answer 1

The correct option is B

thigmotropism

The correct option is B.

Explanation of correct option-

1. Thigmotropism is the directional growth movement of plants that occurs in response to the stimulus of touch.
2. Thigmotropism is generally found in tendrils and creepers.

Explanation of incorrect options-

Option A:

1. The response of plants in the direction of the concentration of water is known as hydrotropism.
2. Plants' roots grow toward the water source and exhibit hydrotropism.

Option C:

1. Phototropism is the tropic movement of plants in the direction of the sunlight.
2. Sunflowers exhibit phototropism.

Option D:

1. The growth of the plants in response to some specific chemical stimulus is termed chemotropism.
2. Growth of the pollen tube toward the stimulus.

Final Answer: The directional movement of plants in response to contact is thigmotropism.