NEET BIOLOGY

Detailed explanation-1: –The stem is very small and slender of the plants such as cucumber and bitter gourd.-The property of thigmotropism is seen by the stem. This is a process in which the stretching or curling of the stem is a wave.-The stem and the tendrils of the plant are curled if stimulation is experienced in the type of touch.

Detailed explanation-2: -The plan 1 such as bitter gourd (karela), bottle gourd (lauki), grape vine and passion flower have stem tendrils which are positively thigmotropic and make these plants to climb up by winding around various types of supports. The plants such as peas and glory lily have leaf tendrils which are positively thigmotropic.

Detailed explanation-3: -An example of thigmotropism is the coiling movement of tendrils in the direction of an object that it touches. On the other hand, the folding movement of the Mimosa pudica leaflets, can be considered as an example of thigmonastism.

Detailed explanation-4: -Thigmotropism is the directional response of a plant organ to touch or physical contact with a solid object. This directional response is generally caused by the induction of some pattern of differential growth. This phenomenon is clearly illustrated by the climbing tendrils of some plants, such as the sweet pea.

Detailed explanation-5: -Thigmotropism is plant growth response to touch. An example of this tropism is the curling of a vine tendril around objects that it touches.