Q33 of 231 Page 94

What is meant by ‘tropisms’ (or tropic movements)? Explain with an example.

Tropism is the turning or bending movement of a plant in a particular direction in response to an external stimulus such as gravity or light.

Example – The process that represents the bending of plant stem towards light is known as positive phototropism.


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31

Why is the folding up of the leaves of a sensitive plant on touching with a finger not a tropism?

 32

Why is the closing of a dandelion flower at dusk (when it gets dark) not a tropism?

 33

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

 33

How do tropisms differ from nasties (or nastic movements)?