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Plant Hormones
| Question | Answer |
|---|---|
| what is an auxin? | a plant hormone that controls the growth near the tips of shoots and roots. it controls the growth of a plant in response to light, gravity and moisture |
| what do auxins do in shoots? | promotes/stimulates growth |
| what do auxins do in roots? | inhibits growth |
| what is the response to light called? | phototropism |
| what is the response to gravity called? | gravitropism or geotropism |
| shoots grow towards light. when a shoot tip is exposed to light, more auxin accumulates on the side that's in the shade than that's in the light why? | this makes the cell grow faster on the shaded side so the shoot bends towards the light |
| shoots grow away from gravity. when a shoot is growing sideways, gravity produces an unequal distribution of auxin in the tip, with more auxin on the lower side why? | this causes the lower side to grow faster bending the shoot upwards |
| roots grow towards gravity. a root growing sideways will also have more auxin on its lower side why? | in a root the extra auxins inhibits growth. this means the cells on top grow faster and the root bends downwards |
| roots grow towards moisture. an uneven amount of moisture either side of a root produces more auxin on the side with moisture why? | this inhibits growth on that side causing the root to bend in that direction towards the moisture |
| what is rooting powder? | it contains auxin and if added to plant cuttings they'll produce roots rapidly and start growing new plants |
Created by:
rv1
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