Nerves and hormones:control in plants 2.0 / 5 based on 1 rating ? BiologyNervous system, hormones and behaviourGCSEAQA Created by: ninaCreated on: 17-04-13 19:08 which way do shoots grow? towards the light source 1 of 16 which way do roots grow? downwards towards the water in the soil 2 of 16 why do shoots grow upwards? they need light for photosynthesis 3 of 16 why do roots grown downwards? so they can reach the water in the soil 4 of 16 what are plant hormones called? auxins 5 of 16 what are hormones? chemicals that bring about a change 6 of 16 what is phototropism? the growth of a plant in direction of the light source 7 of 16 where are auxins produced in shoots? tip 8 of 16 what does elongate mean? get longer 9 of 16 what is gravitropism? growth of a plant due to gravity 10 of 16 are roots positively or negatively gravitropic? positive 11 of 16 how does auxin affect the growth of roots? slows down 12 of 16 how does auxin affect the growth of shoots? speeds up 13 of 16 where does auxin accumulate on roots? the bottom 14 of 16 how are rooting hormones used? to encourage plants to grow 15 of 16 how do week killers work? the weeds take in too many hormones, grow out of control and die 16 of 16
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