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(a) What is meant by 'tropisms' (or tropic movements)? Explain with an example.(b) What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case.(c) How do tropisms differ from nasties (or nastic movements)?
(a) Tropism is the directional movement where the plant parts move in a particular direction with the response to the stimulus. Example- Geotropism: Growth of roots towards gravity. Phototropism: Growth of stems towards the sunlight. (b) The different types of tropisms are: (i) Phototropism: The movement of plant parts in response to light is called phototropism. Its stimulus is light. (ii) Geotropism: The movement of plant parts in response to gravity is called geotropism. Its stimulus is gravity. (iii) Hydrotropism: The movement of plant parts in response to water is called hydrotropism. Its stimulus is water. (iv) Chemotropism: The movement of plant parts in response to chemicals is called chemotropism. Its stimulus is chemical. (v) Thigmotropism: The movement of plant parts in response to touch is called thigmotropism. Its stimulus is touch. (c) Tropism is a directional movement where the parts of plant move in a particular direction with the response to stimulus. These movements are exhibited by all parts of a plant. Nasties are the non-directional movements of plant parts in response to an external stimulus. These movements are exhibited by the flat organs (like leaves and petals of flowers) of a plant.
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