Hydrotropism: In relation to the stimulus of water, the movement or the growth of a plant is called hydrotropic movement. This is also called hydrotropism. In this type of movement, roots show positive responses, as they move and grow towards the water.Thermotropism: In response to the changing atmospheric temperature, tropic movement of plants or a part of the plant started to grow or develop, this process of responding to temperature is called Thermotropism. For example, the Rhododendron plan, where leaves are shredded in response to cold weather.