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प्रश्न
What happens to the dandelion flower
- during the daytime, and
- at night?
What is this phenomenon known as?
उत्तर
- A dandelion flower opens up during the day.
- It closes in the night.
This phenomenon is known as photonasty.
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संबंधित प्रश्न
What does a root do in response to light? What is this phenomenon known as?
What is the difference between photonasty and thigmonasty?
Give one example of a plant part which is positively phototropic but negatively geotropic.
Why is the folding up of the leaves of a sensitive plant on touching with a finger not a tropism?
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?
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.
How is movement in plants different from that in animals?
The venus flytrap plants are examples of ______.
Plants exchange gases ______ continuously through these stomata.
Where are auxins synthesized in a plant? Which organ of the plant shows:
- Positive phototropism
- Negative geotropism
- Positive hydrotropism
