What is respiration?

Respiration is a chemical process that releases the energy from sugar molecules such as glucose. 

Answer in your head, out loud, or on paper, then tap the card to flip.

Is respiration an exothermic or endothermic reaction?

Respiration is an exothermic reaction because it involves the release of energy.

Answer in your head, out loud, or on paper, then tap the card to flip.

Give 5 examples of how cells use the energy from respiration.

  1. To combine small molecules to make larger molecules.
  2. To break large molecules into smaller molecules.
  3. For muscle contraction.
  4. To maintain body temperature.
  5. To move substances around the cell.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is metabolism?

The combination of all chemical reactions in an organism.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the word equation for aerobic respiration? 

glucose + oxygen ➔ carbon dioxide + water

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the symbol equation for aerobic respiration?

C6H12O6 + 6O2  ➔  6CO2 + 6H2O

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the word equation for anaerobic respiration in animals? 

glucose ➔ lactic acid

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the word equation for anaerobic respiration in plants and fungi? 

glucose ➔ ethanol + carbon dioxide

Answer in your head, out loud, or on paper, then tap the card to flip.

Which type of respiration releases most energy, why?

Aerobic respiration releases the most energy. 


Anaerobic respiration doesn't break down the glucose molecule completely,  so doesn't release as much energy.

Answer in your head, out loud, or on paper, then tap the card to flip.

Why don't animals always carry out aerobic respiration?

It requires oxygen, and during intense exercise there may not be enough oxygen.

Answer in your head, out loud, or on paper, then tap the card to flip.

What can the ethanol produced by anaerobic respiration be used for?

Making alcoholic drinks.

Answer in your head, out loud, or on paper, then tap the card to flip.

How is anaerobic respiration used in baking bread?

  1. When baking bread we add yeast (unicellular fungi) to the mixture.
  2. As there is limited oxygen in the bread mixture, they will respire anaerobically.
  3. This produces carbon dioxide which forms little bubbles of gas.
  4. These pockets of gas make the bread light and fluffy.

Answer in your head, out loud, or on paper, then tap the card to flip.