S2 Respiration

The diagram shows what happens to glucose in the body.

• A

• B

• C

• D

What are the products of anaerobic respiration in muscles?

• ethanol and carbon dioxide

• ethanol only

• lactic acid and carbon dioxide

• lactic acid only

What is the word equation for aerobic respiration in plants?

• carbon dioxide + water → glucose + oxygen

• glucose + carbon dioxide → water + oxygen

• glucose + oxygen → carbon dioxide + water

• glucose + water → carbon dioxide + oxygen

For which situations is this the correct equation?

glucose + oxygen → carbon dioxide + water

• anaerobic respiration in plants

• aerobic respiration in plants

• anaerobic respiration in humans

• aerobic respiration in humans

The graph shows the lactic acid concentration in blood during and after exercise. The continuation of which process accounts for the shape of the graph at Z?

• deep breathing

• high heart rate

• high rate of breathing

• movement of lactic acid from the muscles

In an experiment to investigate anaerobic respiration, two bottles are set up in a warm room, as shown.

What would happen to each balloon after one day?

• A

• B

• C

• D

Which is the equation for anaerobic respiration in yeast?

• C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂

• C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

• 2CO₂ + 2C₂H₅OH → C₆H₁₂O₆

• 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

The graph shows the energy released by two animals through respiration as the external temperature changes.

Which conclusion can be drawn from the graph?

• Animals 1 and 2 release the least energy at 23 °C.

• Animal 2 always respires faster than animal 1.

• As the temperature rises, respiration always increases

• The rate of respiration is the same for both animals at 23 °C.

Which process in humans does not use energy released from respiration?

• cell division

• diffusion of oxygen

• muscle contraction

• protein synthesis

The graph shows the results of an experiment to investigate the rate of respiration of an organism

at different temperatures. What explains the difference between the rate of respiration at 50 °C and that at 30 °C?

• enzymes working faster at 50 °C

• enzymes working more slowly at 50 °C

• less oxygen available at 50 °C

• more oxygen available at 50 °C