Biology 1 - Controlling plant growth
- Created by: Meep7375
- Created on: 04-12-14 22:32
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- Biology 1 - CONTROLLING PLANT GROWTH
- Factors in the environment control how plants grow.
- Light
- Plants grow towards light - phototropism
- phototropism flows downwards evenly in shoots
- light coming from one direction - auxin moves away from light to side of plant and that side grows more - plant leans towards light
- phototropism flows downwards evenly in shoots
- plants grow away from light - negative phototropism
- Plants grow towards light - phototropism
- Gravity
- Shoots grow against the force of gravity - negative gravitropism
- Roots grow towards the force of gravity - positive gravitropism
- roots also grow towards moisture
- Light
- Hormones control how plants grow
- Auxin
- in shoots auxin encourages quicker growth
- in roots auxin slows growth
- Auxin collects on lower side of root. It slows growth so the shoot bends downwards.
- Use weedkiller with high levels of auxins on weeds, the auxins cause rapid growth and kill the weeds as they grow out of control
- Auxin
- Dip a cutting of a plant into a rooting compound - made of hormones
- Encourages growth of root
- Plant into soil and roots will grow quickly
- Encourages growth of root
- Factors in the environment control how plants grow.
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