Saturday 19 September 2015

Photosynthesis & Foods

  • Photosynthesis is the most important chemical reaction in the world.
  • Photosynthesis takes place mainly in the leaves of green plants.
  • Chlorophyll absorbs light energy from the sun.
  • Light splits up water into hydrogen and oxygen.
  • Plants convert part of the sun's energy that falls on them into chemical energy.
  • The factors necessary for photosynthesis are carbon dioxide, water, chlorophyll and light.
  • The leaf is specially adapted for the process of photosynthesis.
  • The products of photosynthesis are carbohydrates and oxygen.
  • Plants store food in their leaves, stems and/or roots.
  • Food nutrients can be divided into different types. The main types are proteins, fats and carbohydrates.
  • Carbohydrates and fats provide energy while proteins are used for growth and for the replacement of worn-out and dead cells.
  • The lack of the right types of nutrients in the daily diet may result in deficiency diseases.
  • Foods containing starch turn blue-black when iodine solution is added.
  • Protein gives a purple coloration with sodium hydroxide and weak copper sulphate solution. An orange-red/rust-brown precipitate indicates the presence of reducing sugar in substances when Benedict's solution is added and they are heated.

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