Q37 of 231 Page 94

Define thigmotropism. Give one example of thigmotropism.

Thigmotropism is the directional growth movement of a plant part in response to the stimuli (touch). Example: 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.


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36

Define hydrotropism. Give one example of hydrotropism. State whether this example is of positive hydrotropism or negative hydrotropism. Illustrate your answer with the help of labeled diagram.

 37

What is meant by positive tropism and negative tropism? Explain with examples.

 37

What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?

 38

Which of the following is not a plant hormone?