Question

(a) what is (i)phototropism and (ii) geotropism ?with labeled diagrams describe an activity to show that light and gravity change the direction of plant growth.
(b) mention the role of each of the following plant hormones:
(i) Auxin
(ii) abscisic acid

Answer 1

A)
Geotropism allows plants to correctly orient themselves for growth. The roots exhibit positive geotropism and grow towards the earth. The shoot shows negative geotropismby growing away from the earth. Phototropism occurs when plants move towards or away from sunlight.

Activity :: ⤵⤵

take a beaker with water and put a wire mush and then place germinating seed on the wire mush and keep th flask on a carbord peice which is open from one side on in a carbord box and then place it near a window then after 3 or 4 days u will notice that the shoots of the plant will move towards the sunlight and the roots away from sunlight .( see figure in attachment)

B)
Auxin- It is responsible for the growth of the plant which is present at the shoot of the plant. 
Abscisic acid- It inhibits the growth of the plant.

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Answer 2

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