Testing carbon dioxide in respiration

• How do we test for carbon dioxide?

  Hydrogen-carbonate indicator
• What happens when carbon dioxide is present in hydrogen-carbonate indicator?

  The colour goes from orange to yellow
• What is the method for testing carbon dioxide in respiration?

  1. Get some germinated beans (Will respire)
  2. Boil a similar sized bunch of different beans (Killed so cant respire)
  3. Put the same amount of hydrogen-carbonate indicator into 2 test tubes
  4. Place a platform made of gauze into each test tube and place the beans on this
  5. Seal the test tubes with a rubber bung
  6. Leave the apparatus for an hour
  7. Germinated test tube yellow. Boiled test tube orange