Question

how twiners and tendrils make round around the support

Answer 1

Plants with twining leaves, such as clematis, use their leaves like tendrils. The young leaves of these plants areable to twist around slender wires, string, twigs or other leaves. The key is to provide a thin enough support for the leaf stem to curl around

Answer 2

When tendrils come in contact with any support the auxin present in that part diffuses to the other side and makes cells divide (not on place of contact with the support) and thus helps the tendril to climb.

Hope it helps!!!