Question

The tropic movement wherein the tendrils of a pea plant twine around a support.

Hint:

Thigmotropism is crucial for climbing plants, as it helps them secure themselves to supports in order to reach sunlight.

Answer 1

Step 1: Define Tropic Movement.
Tropic movements are directional movements of plant parts in response to environmental stimuli, such as light, gravity, or touch. The tendrils of pea plants exhibit a type of tropic movement known as {thigmotropism}, which is a response to touch or physical contact.
Step 2: Identify the Process.
In thigmotropism, the tendrils of the plant grow and twist around a support in search of physical contact. This helps the plant secure itself to nearby structures for support, aiding its growth in an upward direction.
Step 3: Explain the Role of Thigmotropism.
As the tendrils come into contact with a support, cells on the side of the tendril opposite to the contact area grow faster, causing the tendril to coil around the support. This movement ensures the plant's survival in its environment.