Question

Explain directional movement of a tendril in pea plant in response to touch. Name the hormone responsible for this movement.

Answer 1

1. Directional Movement of a Tendril in Pea Plant: Pea plant tendrils display thigmotropism, a tropic movement in response to touch. Tendrils wrap-around supports, such as nearby plants or structures. Differential development on the tendril's in-contact side causes directional movement. Cells in contact with the support extend slower than those on the opposite side, causing the tendril to twist and wind around it.
2. Hormone Responsible for Thigmotropism: The hormone responsible for thigmotropism in tendrils is auxin. When a tendril meets support, it experiences uneven auxin distribution, resulting in directional growth and movement. This technique enables the tendril to effectively grab and climb a supporting framework.