Answer:
The growth movement of
tendril in response to unilateral stimulus of touch is called thigmotropism.
Tendrils of louki, tori, karela, and sweet pea plants coil around hard objects
when they come in their contact. It occurs due to unequal growth of two sides
of a tendril. The growth of the surface which comes in contact of the support
is retarded, while it remains normal or increased on the other side, due to
which tendril coils around the support.
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