Auxin

Question 1

How does auxin promote positive phototropism in the shoits

Answer 1

1. Auxin is made in the tips of shoots
2. If the plant is exposed to light on one side the auxin will accumulate on the other side
3. Auxin diffuses away from the light to the shaded side of the shoot
4. auxin stimulates cell elongation in the shaded side
5. This means the shoot bends towards the light
6. The plant therefore recieves more light so photosynthesis can occur at a faster rate