Question

Write down an activity to demonstrate
(a) Phototropism
(b) Geotropism

Answer 1

Answer:

phototropism towards light

Geo towards gravity

Answer 2

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:

(A) (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.

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