4) a) Name the growth hormone in plant
b) State the difference between a positive response
and a negative response.
c) Name the response described below and indicate If it is a negative response.
i, Shoots grow away from gravity
ii, Pollen tubes grow toward the Ovule
iii, Roots grow away from light
5) What is the importance of
a) Phototropism
b) Geotropism

a) Auxin

b) positive response is response which is in direction of stimulus while negative is opposite to that

c) i) negative geotropism

ii) positive chemotropism

iii) negative phototropism

d) i) when the stimulus of light comes to plant , its shoots grow towards light while roots away from light shoots have leaves which prepare food while roots do not have to prepare food

ii) similar to above due to the gravity of the earth the roots go down and shoots showing negative geotropism goes up