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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 is the stimulus in thigmotropism?
What does a plant root do in response to water? What is this phenomenon known as?
Give one example of a plant part which is positively phototropic but negatively geotropic.
A plant's response to gravity is called ______.
Which of the following are not tropisms?
(i) growing of pollen tube in response to a sugary substance
(ii) folding up of leaves of sensitive plant in response to touch
(iii) winding of tendril around a support in response to touch
(iv) opening up of the leaves of a daisy flower in response to light
(a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv)
A potted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism.
(a) Name the part X of plant.
(b) Name the part Y of plant.
(c) Which part of the plant, X or Y, will exhibit positive hydrotropism?
(d) Which part of the plant, X or Y, can have tendrils on it?
(e) Which phytohormone causes the part X to exhibit negative phototropism?
The leaves of Mimosa are sensitive to ____________.
The plant part which exhibits negative geotropism is ______.
Give the scientific term for the following:
Growth-dependent movement in plants.
Name a hormone which is responsible for phototropism
