Question

Thread-like structures of grapevine​

Answer 1

Answer:

Climbers such as gourd, grapevine and passion flower have weak stem. Hence the stems of these plants develop threadlike structures called tendrils. Tendrils are aerial stem modification. When they come in contact with a solid support they coil around it and hence support these plants in climbing.

Answer 2

Answer:

Those are called Tendrils

Explanation:

Climbers like grave have tendrils which are thread like, curled in shape. they are extended so that the climbers can take support from the nearby object.