what is phototropism ? how does it occur in plants . Describe ab activity to demonstrate
Answers
Answer:
Phototropism is the the tendency of a plant to grow towards light.
In plants , the stem shows Positive phototropism and the Roots show negative phototropism as the Stem is growing towards the sunlight i.e upwards and the roots are growing in the opposite direction to the sunlight i.e downwards.
Activity - Take a seed and sow it in a pot and put the pot in a dark room with only one light source which is placed horizontally to the plant. Then let the plant grow . After a few weeks , we can observe that the plant has bent and grown in a horizontal manner . This proves Phototropism
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Answer:Phototropism: It is the growth which response to a light stimulus. The cells on the plants that are farthest from the light have a chemical called auxin that reacts when phototropism occurs.
Activity to demonstrate phototropism:
(i) Fill a conical flask with water.
(ii) Cover the neck of the flask with a wire mesh.
(iii) Keep two or three freshly germinated beam seeds on the wire mesh.
(iv) Take a cardboard box which is open from one side.
(v) Keep the flash in the box in such a manner that the open side of the box faces light coming from a window.
(vi) After two or three days, you will notice that the shoots bend towards light and roots away from light.
(vii) Now turn the flask so that the shoots are away from light and the roots towards the light.
(viii) Leave it undisturbed in this condition for a few days.
Folding up of the leaves of mimosa plant is an example of nastic movements or seismonasty.
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