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प्रश्न
Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called:
पर्याय
phototropism
thigmonasty
chemotropism
photonasty
उत्तर
photonasty
Explanation
The response of dandelion flowers to light that involves the movement of the petals is an example of photonasty.
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संबंधित प्रश्न
Name the two types of tendrils.
What does a tendril do in response to the touch of a support? What is this phenomenon known as?
What is meant by 'tropisms' (or tropic movements)? Explain with an example.
The bending of the stem of a plant towards a source of light is caused by the action of a phytohormone known as :
(a) abscisic acid
(b) auxin
(c) gibberellins
(d) cytokinin
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 growing seedling is kept in the dark room. A burning candle is placed near it for a few days. The tip part of the seedling bends towards the burning candle. This is an example of ______.
What is chlorophyll?
Response of plant roots towards water is called:
The movement of sunflower in accordance with the path of sun is due to
Define the following term:
Heliotropism
