HIGHER TIER UNIT 2 SCIENCE

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1. how do plant fertilisers increase crop yield?

  • fertilisers replace essential elements used by previous crop / provide extra essential elements + used to build plant amino acids
  • fertilisers contain essential minerals
  • fertilisers contain essential nutrients
  • they contain potassium
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2. Why do scientists publish their results?

  • so other scientists can gather further evidence or further their own work. so they can gain credit for their work or so work can be checked
  • To keep in a book
  • So scientists can use them as decoration
  • So people know that work was actually done

3. why is high pressure needed?

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

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

  • behavioural adaptations such as migration
  • counter current exchange systems such as hooves
  • thick fur insulates by trapping air particles
  • hair traps heat

5. Why is a catalyst used for?

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

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