Q33 of 231 Page 94

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

Tropisms: These kinds of movements are very slow and always in the direction of stimulus. All parts of a plant (roots, stem and leaves etc.) exhibit these movements.

Nasties: These kinds of movements are rapid and neither away nor towards the stimulus. Leaves and petals of flower exhibit these movements.


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33

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

 33

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

 34

Define phototropism. Give one example of phototropism.

 34

How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams.