What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case.

Different types of tropisms are as follows:

(i) Phototropism – It is the movement of a plant part towards light. The light is the stimulus in this process.

(ii) Geotropism – It is the movement of a plant part towards gravity. The gravity is the stimulus in this process.

(iii) Chemotropism – It is the movement of a plant part in response to a chemical. A chemical is the stimulus in this process.

(iv) Hydrotropism – It is the movement of a plant part in response to water. The water is the stimulus in this process.

(v) Thigmotropism – It is the movement of a plant part in response to touch. Touch is the stimulus in this process.