Showing posts with label Respiration. Show all posts
Showing posts with label Respiration. Show all posts
Saturday, 30 March 2013
2.37 describe experiments to investigate the evolution of carbon dioxide and heat from respiring seeds or other suitable living organisms
Collect the gas coming off the seed and bubble through lime water to see if it turns cloudy. Place in a cool environment and measure the surrounding air heating up.
Wednesday, 20 February 2013
2.36 write the word equation for anaerobic respiration in plants and in animals
Glucose > Lactic acid + Energy
C6H12O6 > 2C3H6O3 + energy
Glucose > ethanol + carbon dioxide + energy
C6H12O6 > 2C2H5OH + 2CO2
C6H12O6 > 2C3H6O3 + energy
Glucose > ethanol + carbon dioxide + energy
C6H12O6 > 2C2H5OH + 2CO2
2.35 write the word equation and the balanced chemical symbol equation for aerobic respiration in living organisms
Glucose + Oxygen > Carbon dioxide + Water + Energy
C6H12O6 + 6O2 → 6CO2 + 6H2O (+ energy)
C6H12O6 + 6O2 → 6CO2 + 6H2O (+ energy)
2.34 describe the differences between aerobic and anaerobic respiration
Aerobic respiration
Glucose + oxygen > carbon dioxide + water + energy
In this form of respiration all of the energy is released from the glucose as it is fully broken down. It is used for day to day life processes- like movement and reproduction- and keeping warm.
Anaerobic respiration
Glucose > lactic acid + energy
Anaerobic respiration takes place when the heart and lungs cannot work fast enough to provide to oxygen needed for aerobic respiration: for example when exercising The energy released is less in anaerobic respiration because the glucose cannot be fully broken down.
The lactic acid produced accumulates in muscles; often making them feel soar. After this process 'excess post-exercise oxygen consumption' takes place. This process involves heavy breathing and fast heart rate to transport oxygen around the body so it can help break down lactic acid into carbon dioxide and water. Note that the time taken for the lactic acid to be removed and for the breathing and heart rate to return to normal is called the recovery period.
Glucose + oxygen > carbon dioxide + water + energy
In this form of respiration all of the energy is released from the glucose as it is fully broken down. It is used for day to day life processes- like movement and reproduction- and keeping warm.
Anaerobic respiration
Glucose > lactic acid + energy
Anaerobic respiration takes place when the heart and lungs cannot work fast enough to provide to oxygen needed for aerobic respiration: for example when exercising The energy released is less in anaerobic respiration because the glucose cannot be fully broken down.
The lactic acid produced accumulates in muscles; often making them feel soar. After this process 'excess post-exercise oxygen consumption' takes place. This process involves heavy breathing and fast heart rate to transport oxygen around the body so it can help break down lactic acid into carbon dioxide and water. Note that the time taken for the lactic acid to be removed and for the breathing and heart rate to return to normal is called the recovery period.
2.33 understand that the process of respiration releases energy in living organisms
Respiration is a reaction that occurs in living things to create energy. It breaks down glucose to release energy.
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