Edexcel IGCSE Biology 复习笔记 2.5.3 Practical: Investigating Photosynthesis & the Evolution of Oxygen

Edexcel IGCSE Biology 复习笔记 2.5.3 Practical: Investigating Photosynthesis & the Evolution of Oxygen

Practical: Evolution of Oxygen

 

  • We can demonstrate the evolution of oxygen (from the process of photosynthesis) using water plants such as Elodea or Camboba - types of pondweed
  • As photosynthesis occurs, oxygen gas produced is released
  • As the plant is in water, the oxygen released can be seen as bubbles leaving the cut end of the pondweed

 

 

Apparatus

  • Beaker
  • Water plant
  • Funnel
  • Boiling tube
  • Splint
  • Bunsen burner (for the oxygen test)
  • Heat proof mat

 

 

 

Method

  • Take a bundle of shoots of a water plant
  • Submerge them in a beaker of water underneath an upturned funnel
  • Fill a boiling tube with water and place it over the end of the funnel
  • As oxygen is produced, the bubbles of gas will collect in the boiling tube and displace the water

 

 

Results and analysis

  • Show that the gas collected is oxygen by relighting a glowing splint

 

 

 

Evolution-of-Oxygen-Practical

 

Experiment to show the evolution of oxygen from a water plant

转载自savemyexam

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