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Question
Give one example of a plant part which is positively phototropic but negatively geotropic.
Solution
Shoots are positively phototropic but negatively geotropic.
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RELATED QUESTIONS
What does a plant root do in response to water? What is this phenomenon known as?
Distinguish between tropic movements and nastic movements in plants. Give examples to illustrate your answer.
What is the difference between photonasty and thigmonasty?
What is meant by 'tropisms' (or tropic movements)? Explain with an example.
The top part A of the flask-shaped reproductive organ X in the flower of a plant secrets a surgery substance into its lower part B which goes towards the bottom part C of the flask-shaped organ. When a tiny grain D coming from the top part E of another reproductive organ Y i the flower falls on part A, it grows a long tube F through the organ X i response to the sugary substance and reaches the bottom part C of flask-shaped organ to carry out fertilisation.
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The tropic movement that helps the climbing vines to find a suitable support is ______.
Match column A with column B.
| Column A | Column B |
| Roots growing downwards into soil. | Positive phototropism |
| Shoots growing towards the light. | Negative geotropism |
| Shoots growing upward. | Negative phototropism |
| Roots growing downwards away from light. | Positive geotropism |
Thigmonasty can be seen in ______.
Analogy:
Hydrotropism: Response towards water:: Phototropism: ______.
Which parts of a plant exhibit Negative geotropism?
