CBSE Class 10 Answered

The curvature of the tendril that follow contact with a support are the result of increased growth on the side opposite the stimulus. The part of the tendril in contact with the object does not grow as rapidly as the part of the tendril away from the object. Contact with a solid object causes the auxin to migrate to the side away from the contact. The cells on the far side of the contact lengthen more than those on the contact side and thus the tendril grows around the contact object.