Aerobic Respiration

What is a requirement for the accurate measurements of the rate of respiration using a respirometer?

• CO₂ must be absorbed by water so that only O₂ production is measured

• Temperature must be kept constant so that the volume changes are only due to O₂ use

• Anaerobic organisms are better to use than aerobic ones as they will produce larger volume changes

• Warm-blooded animals are better to use than cold-blooded animals as they do not change the temperature of the container

Which way will the drop of liquid move in this respirometer and how do you explain it?

• Left - Carbon dioxide produced in respiration is absorbed by the soda lime so the volume of gas in the tube decreases

• Right - Carbon dioxide produced in respiration is absorbed by the soda lime so the volume of gas in the tube increases

• No movement - the volume of CO₂ produced in respiration is the same as the volume of O₂ used so there is no net change

• Depends - The movement will be different depending on whether the woodlice respire anaerobically or aerobically

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When investigating the effect of temperature on the rate of respiration, why do you need tube Q with glass beads?

• To make sure it is a fair test - the volume of glass beads needs to be the same as the volume of soda lime

• It is a control variable - it allows you to see what happens without the soda lime

• It is a control - changes in temperature could also cause the bubble to move and this allows you to take that into account

• Glass beads have a high specific heat capacity so it makes it easier to maintain a constant temperature in the tubes

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Which gas produces most of the bubbles in bread dough?

• Oxygen

• Methane

• Carbon dioxide

• Water vapour

A cricket was placed in a respirometer at constant temperature for 10 minutes. The soap bubble moved along the pipette. What was measured by the movement of the soap bubble?

• Production of carbon dioxide

• Volume of excretory products

• Oxygen consumption

• Release of heat

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The graph shows the changes in lactate and pyruvate measured in an athletes blood during and following a mild exercise period as compared to the period before the exercise. What do these curves suggest?

• Before the exercise there was no pyruvate produced because there was no cell respiration

• During the exercise there was not enough oxygen available for cell respiration so the process was partly anaerobic

• During the exercise the level of lactate increased due to aerobic respiration

• After the exercise the level of lactate decreased because there was enough pyruvate to be used for anaerobic cell respiration

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Which is a waste product of anaerobic respiration in muscle cells?

• Carbon dioxide

• Lactate

• ATP

• Ethanol

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Which are the two waste products released during aerobic respiration?

• Lactate and carbon dioxide

• Glucose and oxygen

• Carbon dioxide and water

• Ethanol and carbon dioxide

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Which respiration releases the highest yield of energy in the form of ATP?

• Fermentation

• Aerobic respiration

• Glycolysis

• Anaerobic respiration in animals

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Aerobic respiration and combustion are similar chemical reactions. Which one involves the controlled release of energy?

• Aerobic respiration

• Combustion

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