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What is phototropism ? Describe an activ...

What is phototropism ? Describe an activity to demonstrate phototropism.

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(a) Phototropism : It is the growth which responds to a light stimulus. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs.
Activity to demonstrate Phototropism :
(a) (i) Fill a comcal flask with water.
(ii) Cover the neck of the flask with a wire mesh.
(iii) Keep two or three freshly germinated bean seeds on the wire mesh.
(iv) Take a cardboard box which is opwn from one side.
(v) Keep the flask 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 light.
(viii) Leave it undisturbed in this condition for a few days you will find that the plant bends towards the light.
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