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Define the term respiration.
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Define the term respiration.
Respiration is a chemical reaction carried out in all living organisms to release energy from glucose.
What is the word equation for aerobic respiration?
The word equation for aerobic respiration is:
glucose + oxygen → carbon dioxide + water
What are the waste products of aerobic respiration?
The waste products of aerobic respiration are carbon dioxide and water.
Write the chemical equation for aerobic respiration.
The balanced chemical equation for aerobic respiration is:
C6H12O6 + 6O2 → 6CO2 + 6H2O
Which organelle is the site of aerobic respiration?
The mitochondria are the site of aerobic respiration.
Write the word equation for anaerobic respiration in animals.
The word equation for anaerobic respiration in animals is:
glucose → lactic acid
True or False?
Anaerobic respiration requires oxygen.
False.
Anaerobic respiration does not require oxygen.
What is the oxygen debt?
The oxygen debt is the oxygen required to remove the build up of lactic acid in muscle cells after anaerobic respiration.
What is the word equation for anaerobic respiration in plants and fungi?
The word equation for anaerobic respiration in plants and fungi is:
glucose → alcohol + carbon dioxide
True or False?
Anaerobic respiration involves the complete breakdown of glucose.
False.
Anaerobic respiration involves the incomplete breakdown of glucose into lactic acid which is later broken down further as oxygen becomes available.
What is the purpose of the core practical: Investigating respiration?
The purpose is to demonstrate the production of carbon dioxide and heat energy during respiration using different organisms.
Name three pieces of apparatus required for the core practical: Investigating carbon dioxide production in seeds.
The apparatus required for the investigation of carbon dioxide production in seeds include:
Boiling tubes
Rubber bungs
Hydrogen carbonate indicator solution
Cotton wool
Glass beads
Germinating seeds
Boiled/dead seeds
What is the role of the hydrogen carbonate indicator when investigating respiration in seeds?
Hydrogen carbonate indicator detects changes in carbon dioxide levels by changing colour.
What colour indicates high carbon dioxide levels in the hydrogen carbonate indicator?
Yellow indicates high carbon dioxide levels in the hydrogen carbonate indicator.
What results would you expect from hydrogen carbonate indicator in a tube containing dead or boiled seeds, when investigating respiration?
Hydrogen carbonate indicator would remain orange because dead or boiled seeds would not be respiring so no carbon dioxide would be produced.
Why would a thermometer show an increase in temperature when investigating respiration with live seeds or other living organisms?
Living/germinating seeds or other living organisms are respiring and releasing heat energy that would be detected by a thermometer.
Name the independent variable when investigating respiration in seeds or other living organisms.
The independent variable when investigating respiration in seeds or other living organisms is to change whether the seeds are living or dead.
What are two control variables required when investigating respiration and the production of heat?
The control variables required when investigating respiration and the production of heat include:
Number and type of seeds
The starting temperature of the flasks
Material and size of the flasks
When investigating respiration using hydrogen carbonate indicator and seeds what colour change would be expected in a control tube containing glass beads instead of seeds?
In a control tube containing glass beads instead of seeds when investigating respiration there would be no colour change in hydrogen carbonate indicator, it will remain orange. This is because there is no change in carbon dioxide levels in the tube.
When investigating temperature changes of respiring seeds why is a vacuum flask used to contain the seeds during the experiment?
When investigating temperature changes of respiring seeds a vacuum flask is used to contain the seeds during the experiment because it is insulated. This means that heat energy does not escape the apparatus.