HIGHER TIER UNIT 2 SCIENCE

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1. explain one way animals bodies are adapted to reduce heat loss

  • counter current exchange systems such as hooves
  • hair traps heat
  • thick fur insulates by trapping air particles
  • behavioural adaptations such as migration
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2. why is high pressure needed?

  • increases of yield
  • reduces activation activity
  • speeds up reaction
  • makes the temperature higher

3. how do plant fertilisers increase crop yield?

  • fertilisers contain essential nutrients
  • they contain potassium
  • fertilisers replace essential elements used by previous crop / provide extra essential elements + used to build plant amino acids
  • fertilisers contain essential minerals

4. Why is a catalyst used for?

  • higher rate of reaction
  • high pressure
  • speeds reaction
  • gives reduced yield

5. Explain how proteins in the leaves change into nitrates

  • leaves decay then ammonia forms nitrifying bacteria converting into ammonia nitrate
  • they become nitrates from proteins
  • they shrivel into nitrates
  • proteins become acids that become nitrates

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