PLANT HORMONES AND RESPONSES
- Created by: Chelsey`Johnson
- Created on: 22-05-16 11:48
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- PLANT HORMONES AND RESPONSES
- AUXIN
- plant hormone which controls growth at the tips of shoots and roots
- produced in tips and diffuses backwards to stimulate the cell elongation process
- promotes growth in shoot and inhibits growth in root
- PHOTOTROPISM
- shoots are positively geotropic: grows towards the light
- roots are negatively geotropic: grow away from the light
- GEOTROPISM
- when a shoot grows sideways, there is an unequal distribution of auxin -> shoot bends upwards meaning shoots are negatively geotropic
- roots are positively geotropic: grows downwards towards gravity
- EXPIREMENT: DEMONSTRATING PHOTROPIC AND GEOTROPIC PLANT RESPONSES
- petri dishes containing moist cotton wool and plant material put into light proof boxes
- small slit is but into one side of the box so light can shine in
- control seedlings can either have aluminium capos on tips or kept in a box without light
- a clinostat is needed to demonstrate geotropism
- AUXIN
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