Q35 of 231 Page 94

Name one plant part which exhibits positive thigmotropism.

A tendril is a specialized leaf, petiole or stem with a threadlike shape. It is used by climbing plants for support and attachment. The tendrils grow towards the things they happen to touch and the phenomenon is known as thigmotropism.


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35

Define geotropism. Give one example of geotropism.

 35

What is meant by 'positive geotropism' and 'negative geotropism? Give one example of each type. Draw a labeled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.

 36

How does control and coordination take place in plants? How does it differ from that in animals?

 36

Name five stimuli which act on plants. Name the type of tropism produced by each one of these stimuli.