GCSE Biology

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Author:
ghoran
ID:
150871
Filename:
GCSE Biology
Updated:
2012-04-29 05:31:28
Tags:
nerves hormones control plants
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  1. plants are sensitive to
    • light
    • gravity
    • moisture
    • they respond by parts of the plant growing towards or away from them
    • these slow growth responses are calles tropisms
  2. shoots grow ..... the light . this type of response is called ........ and because it is ...... the light the shoot is described as ....... .......
    • towards
    • phototropism
    • towrdas
    • positively phototropic
  3. roots grow .... gravity . this type of response is called g....... and because it is ..... gravity is is described as ....... .....
    • towards
    • geotropism
    • towards
    • positively
    • geotropic
  4. shoots grow ... from gravity . this type of repsonse is described as ...... ....
    • away
    • negatively geotropic
  5. roots grow ..... water . this type of repsonse is called ......... and because it grows ..... water the root is described as ....... .......
    • towards
    • hydrotropism
    • towards
    • positively hydrotropic
  6. planst produce hormones called
    auxins
  7. in shoots and roots it is the .... which produces auxin and causes :
    the cells to elongate and grow
  8. if a shoot only gets light from one side ,
    • most of the auxin will collect on the shaded side
    • the auxin makes the shoot grow faster on the shaded side
    • the shoot will bend towards light
  9. if a plant is put on its side the auxin
    builds up on the lower side of the shoot and root

    • in the shoot the auxin causes the lower side to grow faster
    • causing the shoot to grow upwards

    • in the root the auxin causes the lower side to grow slower
    • so the upper surface grows faster this causes the root to bend downwards

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