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6. write the balanced symbol equation for N2+H2-->NH3

  • N+H-->NH
  • N2+H2-->NH4
  • N2+3H2-->2NH3
  • N2+H2-->N2H2

7. The energy is faeces can be used by other organisms, describe how?

  • eaten by decomposers
  • broken down by decomposers such as beetles or insects
  • used as manure
  • eaten by animals

8. 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

9. Write about biochemical adaptations to very cold climates.

  • contain enzymes with lower optimum temperatures but cells do not freeze as freezing would damage cells
  • enzymes spread easier on smaller surface areas
  • larger leaves absorb more sunlight
  • The smaller the plant the less energy is needed so more can be spent on specific parts of the plants