Investigating Respiration Flashcards

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1
Q

germinating peas experiment

A
  • as the peas start to grow they respire, releasing heat
  • the thermos flask is insulated, so heat is not transferred to the surroundings and we can measure the change in temperature
  • we only see a temperature rise in thermos A, as the peas in thermos B are dead (they have been boiled)
  • in both thermos flasks the peas are soaked in Milton solution (bleach)
  • this kills any bacteria - bacteria would also respire so this would affect results
  • we could also use gas delivery tubes to collect any gas produced
  • the gas can then be bubbled through limewater - the gas from flask A only would turn the limewater cloudy - this shows that carbon dioxide is produced
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2
Q

hydrogen carbonate indicator and insects experiment

A
  • the indicator is red, but turns yellow when the carbon dioxide concentration increases
  • carbon dioxide reacts with water to form a weak acid
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3
Q

investigating anaerobic respiration in yeast

A
  • this equipment can be used to investigate the effect of changing a single variable on the rate of anaerobic respiration in yeast
  • dependent variable could be the time taken for the limewater to turn cloudy
  • you could also connect the delivery tube to a gas syringe, to measure the volume of carbon dioxide produced
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4
Q

what do you do when an examiner asks you to describe experimental data?

A

say what the results are

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5
Q

what do you do when an examiner asks you to explain what the results are?

A

say why the results occur

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