598298
Description
Mind Map by Rosie Rigby, updated more than 1 year ago
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Created by Rosie Rigby
about 11 years ago
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Plant Hormones
- Auxin and tropisms
- Phototropisms- response to light.
- 1, 2 & 3) When a shoot tip is exposed to light more auxin
accumulates in the side that's in the SHADE
- 4) This makes the cells grow faster on the SHADED side to
the plant grows TOWARDS the light.
- 4) This makes the cells grow faster on the SHADED side to
the plant grows TOWARDS the light.
- 1, 2 & 3) When a shoot tip is exposed to light more auxin
accumulates in the side that's in the SHADE
- Geotropisms- response to gravity.
- 1) When a shoot is growing on its side, gravity
produces an unequal balance of auxin. MORE auxin
accumulates on the LOWER side.
- 2)This causes the lower side to grow upwards
(AWAY from gravity) faster
- 2)This causes the lower side to grow upwards
(AWAY from gravity) faster
- However it is different in roots.
- 1) A root growing sideways will accumulate more auxin on its
lower side. However this auxin inhibits growth and so the cells on
the TOP side grow FASTER and the plant curves DOWNWARDS
- 1) A root growing sideways will accumulate more auxin on its
lower side. However this auxin inhibits growth and so the cells on
the TOP side grow FASTER and the plant curves DOWNWARDS
- 1) When a shoot is growing on its side, gravity
produces an unequal balance of auxin. MORE auxin
accumulates on the LOWER side.
- Hydrotropisms- reactions to water
- Roots grow towards water. so produces MORE auxin on the side with
MORE water
- This causes the plant to move towards the water
because the auxin inhibits growth on that side so the
plant bends.
- This causes the plant to move towards the water
because the auxin inhibits growth on that side so the
plant bends.
- Roots grow towards water. so produces MORE auxin on the side with
MORE water
- Phototropisms- response to light.
- What is auxin?
- Hormone that controls growth near tips of shoots and roots.
- PROMOTES growth in the SHOOTS and
INHIBITS growth in the ROOTS
- PROMOTES growth in the SHOOTS and
INHIBITS growth in the ROOTS
- Controls growth in response to tropisms (geo- , hydro- & photo-)
- Produced in the tips and works backwards to stimulate cell elongation
- If the tip is removed, the plant may stop growing as no auxin is available
- If the tip is removed, the plant may stop growing as no auxin is available
- Hormone that controls growth near tips of shoots and roots.
- Hormones in agriculture.
- Can be extracted and used by people for:
- Selective weedkillers. Most weeds are broad leaved unlike the grasses and cereals. The weedkillers are made of growth hormones.
- These hormones only affect the broad leaved plants and disrupts their growth pattern so the die.
- These hormones only affect the broad leaved plants and disrupts their growth pattern so the die.
- Rooting Powder.
- The auxin in the powder means the plant cuttings produce roots quickly and start growing as new plants.
- Great way of cloning plants quickly
- Great way of cloning plants quickly
- The auxin in the powder means the plant cuttings produce roots quickly and start growing as new plants.
- Selective weedkillers. Most weeds are broad leaved unlike the grasses and cereals. The weedkillers are made of growth hormones.
- Can be extracted and used by people for:
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