B6 - Life in soil

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  • Created by: Naomi
  • Created on: 21-01-13 14:21
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  • Life in soil
    • Components of soil
      • Living plants and animals
      • Different sized mineral particles
      • Decayed reamins of dead plants and animals
      • Air
        • Including oxygen for respiration in the living plants and animals
      • Water containing dissolved minerals
    • Why do plants need soil?
      • Minerals for growth
      • Water to stay alive
      • Anchorage for the roots
    • Different types of soil
      • Soils can be acidic, alkaline or neutral. There are soils that drain well and others that can get waterlogged
      • Sandy soils drain well because they have large mineral particles with big air spaces
      • Clay soils have small particles close together so the become easily waterlogged
      • Loam is a good soil because it contains clay and sand
        • Loam usually has large amounts of decomposed material called humus
    • Humus is important to living things in the soil because it will:
      • Decompose to release minerals
      • Loam usually has large amounts of decomposed material called humus
      • Increase the air content of the soil
    • Earthworms are important to soil structure and fertility because they:
      • Bury organic material for decomposition by bacteria and fungi
      • Aerate and drain the soil
        • This allows organisms to respire aerobically
      • Mix up soil layers
        • This is so that dead material is decomposed
      • Add chalk to the soil, so neutralising the acid
        • The chalk comes from glands in the worm's digestive system
        • This is important because some plants will not grow if the pH is too low


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