2.81 Phototropism

Describe the positive Phototropism of stem.
- photo= light     tropism= growth and response   positive= towards the light
-with light coming from all directions the stem will grow forwards and upwards.
-with light coming from lateral (side) light source the stem will bend in growth towards the light.
-the light on the side causes movement to the other side (side with no light) of a compound known as Auxin. which is a hormone that causes growth and bending.