IGCSE Topic 6 - Aerobic & Anaerobic Respiration

What is respiration?

• Breathing in oxygen and breathing out carbon dioxide.

• When red blood cells absorb oxygen and release carbon dioxide.

• A chemical reaction that breaks down glucose.

In which cell organelle does respiration occur?

• Nucleus

• Mitochondrion

• Ribosome

• Chloroplast

When does respiration occur in plant cells?

• All the time

• During the day

• During the night

When does respiration occur in animal cells?

• All the time

• During the day

• During the night

Which statement correctly describes respiration?

• Respiration is a chemical reaction that PRODUCES energy.

• Respiration is a chemical reaction that MAKES energy.

• Respiration is a chemical reaction that CREATES energy.

• Respiration is a chemical reaction that RELEASES energy.

Which of the following is used to store the energy released by respiration?

• ATP

• ADH

• DNA

• RBC

Which of the following processes do NOT use energy from respiration?

• Active transport

• Osmosis

• Cell division

• Muscle contraction

• Photosynthesis

What is the word equation for aerobic respiration?

• glucose => carbon dioxide + ethanol

• glucose => lactic acid

• glucose + oxygen => carbon dioxide + water

• glucose + oxygen => lactic acid

The diagram shows an experiment to investigate the rate at which small land animals and freshwater animals give off carbon dioxide during respiration.

All the tubes were kept at the same temperature and all animals were equally active.

In which tube would the indicator be the first to change colour?

• A

• B

• C

• D

Which substance is produced during anaerobic respiration in human muscle cells?

• amino acid

• fatty acid

• glucose

• lactic acid