Respiration

Respiration occurs in living cells. What is released during respiration?

• energy     

• glucose

• nutrients

• oxygen

Which word equation represents aerobic respiration?

• carbon dioxide + water → glucose

• carbon dioxide + water → glucose + oxygen

• glucose + oxygen → carbon dioxide

• glucose + oxygen → carbon dioxide + water

Which statement about aerobic respiration is correct?

• It exchanges gases through the walls of the alveoli.

• It expels carbon dioxide from the lungs.

• It only produces carbon dioxide.

• It uses oxygen to release energy from glucose.

What is produced by anaerobic respiration in a muscle cell during exercise?

• carbon dioxide and lactic acid

    

• carbon dioxide and water

• carbon dioxide only

• lactic acid only

Which statement explains why, even when athletes have finished a race, they carry on breathing more quickly and deeply than normal?

• to remove carbon dioxide produced during anaerobic respiration

• to remove urea produced by the breakdown of amino acids

• to replace stored glycogen in muscles

•    to take in extra oxygen to break-down lactic acid

A student set up the experiment shown in the diagram.

Which statement is correct?

• If the limewater stays colourless, aerobic respiration is occurring.

•    If the limewater stays colourless, photosynthesis is occurring.

• If the limewater turns milky white, aerobic respiration is occurring.

• If the limewater turns milky white, photosynthesis is occurring.