Auxins Change the Direction of Root and Shoot Growth Flashcards
Shoots are positively…
Phototropic (grow towards light)
What happens when a shoot tip is exposed to light?
It accumulates more auxin on the side that’s In the shade than the side that’s in the light
Phototropic - This makes the cells grow faster on… so…
The shaded side, so the shoot bends towards the light
Shoots are negatively…
Geotropic (grow away from gravity)
Geotropic - What happens when a shoot is growing sideways?
Gravity produces an unequal distribution of auxin in the tip, with more auxin on the lower side
Geotropic - What does this cause the lower side to do?
Grow faster, bending the shoot upwards
Roots are positively…
Geotropic (grow towards gravity)
Geotropic - What will a root growing sideways also have?
More auxin on its lower side
In a root the extra auxin inhibits growth. What does this mean for the cells?
The cells on top elongate faster, and the root bends downwards
