B1 AQA - human biology plant hormones
- Created by: Rianna Gokani
- Created on: 23-12-12 14:31
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- Plant hormones
- Auxin
- Auxins a plant hormone
- Auxin is a plant hormone that controls groth near the tips of shoots and roots
- Controls growth of plant in response to ,,,
- Light ( Phototropism)
- Gravity ( gravitropism or geotropism)
- Moisture
- Ausin produced in tips, moves backwards to stimulate cell elongation (enlargement process) that occors in cells behind tips.
- If tip of shoot removed, no auxin produced so shoot may stop growth.
- Extra auxin promotes growth in shoot inhibits growth in shoot- produce desired result
- shoot grows towards light
- when shoot tip exposed to light, more auxin on side thats in shade
- Makes cells grow (elongates) faster on shaded side, so shoot bends towards the light.
- Shoot grow away from gravity
- when shoot growing sideways, gravity produces equal distribution in tip, with more auxin on lower side.
- Causes lower side to grow faster, bending the shoot upwards.
- Roots grow towards gravity
- Root growing sideways have more auxin on lower side.
- In root the extra auxin inhibits growth, that means cells ontop elongate faster, root bends downwards.
- Roots grow towards moisture.
- An uneven amount of moisture either side of root produces more auxin on side with more moisture.
- Inhibits growth on that side cause root to bend in that direction towards the moisture .
- Auxins a plant hormone
- Uses in agriculture
- plant hormones can be extracted + used by people or artificial versions can be made - useful
- Weeds in crop feilds broad-leaved, unlike grass + cereals have narrow leaves
- slelective weedkillers made from plant growth hormones
- Only affect broad leaved plants
- Disrupt normal growth patterns , soonb kills them but leaves crops untoched.
- plant cuttings wont always grow in soil. Add rooting powder, contains auxin, they'll produce roots rapidly + start growing as new plants
- helps growers produce lots of clones of really good plants very quickly.
- Auxin
- Auxin
- Auxins a plant hormone
- Auxin is a plant hormone that controls groth near the tips of shoots and roots
- Controls growth of plant in response to ,,,
- Light ( Phototropism)
- Gravity ( gravitropism or geotropism)
- Moisture
- Ausin produced in tips, moves backwards to stimulate cell elongation (enlargement process) that occors in cells behind tips.
- If tip of shoot removed, no auxin produced so shoot may stop growth.
- Extra auxin promotes growth in shoot inhibits growth in shoot- produce desired result
- shoot grows towards light
- when shoot tip exposed to light, more auxin on side thats in shade
- Makes cells grow (elongates) faster on shaded side, so shoot bends towards the light.
- Shoot grow away from gravity
- when shoot growing sideways, gravity produces equal distribution in tip, with more auxin on lower side.
- Causes lower side to grow faster, bending the shoot upwards.
- Roots grow towards gravity
- Root growing sideways have more auxin on lower side.
- In root the extra auxin inhibits growth, that means cells ontop elongate faster, root bends downwards.
- Roots grow towards moisture.
- An uneven amount of moisture either side of root produces more auxin on side with more moisture.
- Inhibits growth on that side cause root to bend in that direction towards the moisture .
- Auxins a plant hormone
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