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प्रश्न
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 |
उत्तर
| Column A | Column B |
| Roots growing downwards into soil. | Positive geotropism |
| Shoots growing towards the light. | Positive phototropism |
| Shoots growing upward. | Negative geotropism |
| Roots growing downwards away from light. | Negative phototropism |
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संबंधित प्रश्न
What is the stimulus in hydrotropism?
Why is the folding up of the leaves of a sensitive plant on touching with a finger not a tropism?
Define phototropism. Give one example of phototropism.
The movement of a shoot towards light is:
While conducting experiments to study the effect of various stimuli on the plants, it was observed that the roots of a plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X, however, bends away from stimuli A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to too much weight of the earth. Keeping these points in mind, answer the following question:
- What could stimulus A be?
- Name the stimulus B.
- What could stimulus C be?
- The branches of a fallen tree in a forest grow straight up in response to two stimuli. What could be these two stimuli out of A, B and C? Also name these two stimuli.
Plants take in carbondioxide for photosynthesis but need ______ for their living.
State whether true or false. If false, correct the statement.
Shoot is positively phototropic and negatively geotropic.
The movement of shoot towards light is
______ of sweet peas exhibit thigmotropism.
Given below are the figures showing some kinds of tropic movements in plants. Study the same and answer the following questions:
- Which one of these figures is correct? Give reason in support of your answer.
- Name the kinds of movements shown by the root system and shoot system. Define each.
- What are the two stimuli which affect root system and shoot system positively? Name them.
- Which of the following stimuli affects the growth of the root strongly?
- Gravity
- Water
- Draw a neat and labelled diagram of the longitudinal section of a pistil showing chemotropism in an angiospermic plant.
