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positive geoptropism meaning and example
grows towards gravity, roots
negative geotropism def and example
grows opposite gravity, stem
positive phototropism def and example
grows towards light, stem
negative phototropism def and example
grows away from light, roots
why do roots grow in the direction of gravity
to anchor the plant in the soil to enable survival
why do shoots grow towards light
for maximum light absorption for photosynthesis
how does positive phototropism work
auxin diffuses to the shaded side of the stem where it stimulates growth so the shaded cells grow larger and elongate whilst the unshaded cells grow slower. this causes the stem to bend towards the light.
how does negative phototropism work
auxin diffuses to the shaded side of the stem where it inhibits growth so the shaded cells grow slower than the unshaded side. this causes the roots to bend away from the light.
how does positive geotropism work
auxin accumulates at the bottom due to gravity where it inhibits growth, so the bottom side grows slower than the top, which causes the roots to bend downwards.
how does negative geotropism work
auxin accumulates at the bottom due to gravity where it stimulates growth, so the bottom side grows longer and elongates faster than the top, which causes the stem to bend upwards.
where is auxin found in plant originally
tip
what is auxin
a plant growth hormone
What does auxin cause in the roots
Inhibition
What does auxin cause in the shoots
Elongation