Control in plants
- Created by: NWILKA1
- Created on: 28-05-14 13:38
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- Control in Plants
- Plants are sensitive to...
- Light
- Shoots grow towards light for photosynthesis
- Positive Phototropism
- Shoots grow towards light for photosynthesis
- Moisture
- Roots grow towards moisture
- Positive Hydrotropism
- Roots always have a stronger response to water that gravity.
- Roots grow towards moisture
- Gravity
- Shoots grow against the force of gravity
- Negative geotropism
- Shoots grow against the force of gravity
- Light
- Tropisms
- A growth movement in response to a stimulus
- Light
- Phototropism
- Water
- Hydrotropism
- Gravity
- Geotropism
- Auxins
- Plant growth hormones
- Produced in the shoot tips and roots down the stem.
- Speed up growth in shoots
- Inhibit growth in roots.
- Responsible for plant growth responses
- Using plant hormones
- Encourage root growth in plant soil.
- Enables plant to obtain water and to be anchored in.
- Enables plants to be cloned quickly, cheaply and easily.
- Weed killers
- Most weeds are broad leaved plants whereas crops are narrow leaved plants
- Weed killers contain concentrations of plant hormones that are only effective to broad leaved plants.
- Allows farmers to kill off weeds whilst leaving their plants unharmed
- Weed killers contain concentrations of plant hormones that are only effective to broad leaved plants.
- Most weeds are broad leaved plants whereas crops are narrow leaved plants
- Encourage root growth in plant soil.
- Plants are sensitive to...
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