What are tropic movements? Briefly explain various types of tropic movements in plants.
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Tropic movements:-When a plant shows some growth movement in response to a stimulus, it is known as tropism. Tropism is a direction, which is specific and depends on the direction of the stimulus.
Types of tropic movements:-
i)phototropism:Plants grow towards or away from the light, the type of tropism in the response to light is called phototropism.
ii)Gravitropism:-It is a type of tropism where plants show some growth in response to gravity. Stems are negative to the gravitropism while roots are positive to the gravitropic.
iii)Chemotropism:-When plants grow in response to certain chemicals, this type of response is known as chemotropism.
iv)Thigmotropism:-The growing or developing movements made through plants in response to contact with a solid object are called thigmotropism. These type of movements are usually seen in tendrils and twiners.
v)Hydrotropism:-The movement or the growth of a plant in relation to the stimulus of water are called hydrotropic movements and the equivalent response to the stimulus of water is called hydrotropism.
vi)Thermotropism:-It is the form of a tropic movement in which a plant or a part of the plant responds to the changing atmospheric temperature. For example, this type of movement is usually seen in the plants of Rhododendron. Here leaves starts twisting or bending in response to cold temperatures.