B9 Respiration T12 Flashcards
Where and what does respiration do
- in every living cell in living things
- supply ATP (energy) to cells
Define ATP
molecule that provides energy to cells
Which produces more energy, aerobic or anaerobic?
aerobic
Equation for aerobic respiration in animals
C6 H12O6 + O2 —> CO2 + H2O
Equation for anaerobic respiration in animals
Glucose (C6 H12O6) —> Lactic acid
Equation for anaerobic respiration in plants
Glucose (C6 H12O6) —> Ethanol + Carbon dioxide (CO2)
Practical: investigate the evolution of carbon dioxide from respiring seeds or other suitable living organisms
Practical: investigate the evolution of carbon dioxide from respiring seeds or other suitable
living organisms
1) Connect a capillary tube from the air into a flask containing sodium hydroxide, which will
absorb carbon dioxide
2) Connect this flask with a capillary tube to another flask containing hydrogen carbonate
indicator (which is red at neutral pH and yellow at low pH, i.e. when carbon dioxide is present)
3) Connect the second flask to a third flask containing either germinating seeds or respiring
animals, such as worms
4) Connect the third flask to another flask containing hydrogen carbonate indicator, such as in
step 2
The sodium hydroxide solution in the first flask will
absorb carbon dioxide from the air, which will turn
the second flask red, as it will have neutral pH.
However, the respiring organism will produce carbon
dioxide and will therefore turn the indicator yellow
Practical: investigate the evolution of heat from respiring seeds or other suitable living organisms
1) Use 2 vacuum flasks, one containing living germinating seeds and the other containing dead or
boiled seeds (as a control)
2) Put a thermometer wrapped in cotton wool (to prevent heat from escaping) to measure
temperature
3) Measure initial temperature
4) Leave seeds for a few days and then measure end temperature
The live germinating seeds will release heat due to aerobic respiration and so the temperature will
increase.
