NEET BIOLOGY

Detailed explanation-1: -The tendrils coil around hard objects or support due to a stimulus of touch (thigmotropism ) which causes less growth on the side in contact with support than the side which is away from it. This unequal growth of two sides of tendril makes it coil around the support.

Detailed explanation-2: -Tendrils respond to touch and to chemical factors by curling, twining, or adhering to suitable structures or hosts.

Detailed explanation-3: -Auxin is plant hormone which is synthesized at the tip of the shoot. It helps the cell grow longer. When a tendril comes in contact with a support, auxin stimulates faster growth of the cells on the opposite side that’s why the tendril forms a coil around the support.

Detailed explanation-4: -thigmotropic movement. The movement of plants in response to the stimulus of touch is called thigmotropic movement. This type of movement is commonly observed in tendrils and ‘touch-me-not plants’.

Detailed explanation-5: -So, the correct answer is ‘Thigmotropism’