2.81 Phototropism

Notes

"Describing positive phototropism of stems"

Phototropism = Growth response of plant due to light
   - positive (towards light)

Stems


Uniform (all-direction) light = Stems will grow upwards/forwards in direction

Lateral light source (one side) = Stem will bend in tropism towards light
   - Direction of tropism adaptation (light from right) --> Auxin (plant hormone on left), causes more growth on left, pushing stem to right.

NOTE on Auxin: Causes cells to elongate, not divide