Aerobic and anaerobic respiration: glucose + oxygen carbon dioxide + water

Q: How do I revise Aerobic and anaerobic respiration: glucose + oxygen carbon dioxide + water for GCSE?

Read the notes on Aerobic and anaerobic respiration: glucose + oxygen carbon dioxide + water, then test yourself without looking. Answering questions and checking what you missed builds recall faster than re-reading.

Q: Is this Aerobic and anaerobic respiration: glucose + oxygen carbon dioxide + water guide aligned to the AQA specification?

Yes. This guide is linked to the Aerobic and anaerobic respiration: glucose + oxygen carbon dioxide + water topic in the AQA GCSE specification.

Aerobic respiration is the controlled release of energy from glucose using oxygen.

Study notes

From the checked teaching notes for this specification point.

The idea

Aerobic respiration is the controlled release of energy from glucose using oxygen. This word equation summarises the overall change: glucose reacts with oxygen to produce carbon dioxide and water. The reaction happens continuously in the mitochondria of cells, transferring energy that powers processes such as muscle contraction and protein synthesis. The equation is a summary of many enzyme-controlled reactions, but the overall inputs are glucose and oxygen and the overall outputs are carbon dioxide and water.

For example: During exercise, muscle cells respire faster, using more glucose and oxygen and producing more carbon dioxide and water, which is why breathing and heart rate increase to supply reactants and remove waste.

What earns the marks

Identifies glucose and oxygen as the reactants, with glucose acting as the energy source.
States that carbon dioxide and water are the products of aerobic respiration.
Links the equation to energy transfer for cell processes such as muscle contraction, active transport, and protein synthesis.
Recognises that the equation is a summary of many enzyme-controlled reactions occurring mainly in mitochondria.
Applies the equation to contexts such as exercise, where increased respiration raises oxygen demand and carbon dioxide production.

Common mistakes and how to put them right

Writing the products as carbon dioxide and water but omitting oxygen from the reactants.
Put it right: Oxygen is a reactant and must appear on the left of the arrow.
Reversing the equation to show carbon dioxide and water reacting.
Put it right: In respiration glucose and oxygen are the reactants, so they appear before the arrow.
Confusing respiration with photosynthesis.
Put it right: Photosynthesis uses carbon dioxide and water with light energy, whereas respiration uses glucose and oxygen and transfers energy.

Exam tips

Write the word equation with reactants on the left and products on the right, separated by an arrow.
When asked to explain, link the equation to energy transfer and to a named cell process rather than only naming the products.
Check that every substance in the equation is named correctly and that oxygen appears as a reactant.

Try the lesson

The start of the Aerobic and anaerobic respiration: glucose + oxygen carbon dioxide + water lesson, made from checked teaching notes for this specification point.

Have a go first

Which two substances are the reactants in aerobic respiration?

Tip: press 1 to 4 to choose

See it

A left-to-right flowchart. Two nodes on the left, glucose and oxygen, both have arrows pointing into a central node labelled aerobic respiration. From aerobic respiration, three arrows point out to the right to three nodes: carbon dioxide, water, and energy transferred. — It shows glucose and oxygen as the reactants of aerobic respiration, producing carbon dioxide, water and transferred energy.

Label the diagram

Some boxes have lost their names. Pick the right name for each number.

The diagram again, with 3 boxes numbered instead of named. A left-to-right flowchart. Two nodes on the left, glucose and oxygen, both have arrows pointing into a central node labelled aerobic respiration. From aerobic respiration, three arrows point out to the right to three nodes: carbon dioxide, water, and energy transferred.

1Box 1
2Box 2
3Box 3

0 of 3 labelled

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