Respiration
Overview
Every living cell needs a continuous supply of energy to drive processes like muscle contraction, protein synthesis, and cell division. That energy comes from respiration, a set of chemical reactions that release energy from glucose. Importantly, respiration is not the same as breathing: it happens inside cells, not inside lungs.
In this lesson you will compare aerobic and anaerobic pathways, learn the word and balanced symbol equations for each, and explore how ATP acts as the universal energy currency of the cell. These reactions underpin almost every other topic in biology, and Edexcel tests them as short-answer and extended-writing questions across both papers.
Objectives
- Understand how the process of respiration produces ATP in living organisms
- Know that ATP provides energy for cells
- Describe the differences between aerobic and anaerobic respiration
- Know the word equation and the balanced chemical symbol equation for aerobic respiration in living organisms
- Know the word equation for anaerobic respiration in plants and in animals
- Investigate the evolution of carbon dioxide and heat from respiring seeds or other suitable living organisms
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Respiration. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Where does aerobic respiration mainly take place in a cell? A) Nucleus B) Cell membrane C) Cytoplasm D) Mitochondria Answer: D
- What is the waste product of anaerobic respiration in yeast? A) Lactic acid B) Carbon dioxide only C) Ethanol and carbon dioxide D) Water and carbon dioxide Answer: C
- Which of the following is NOT a use of energy from respiration? A) Muscle contraction B) Photosynthesis C) Active transport D) Protein synthesis Answer: B
- How many more times ATP does aerobic respiration produce per glucose molecule compared with anaerobic? A) About 2 times B) About 5 times C) About 19 times D) About 100 times Answer: C
- What causes the oxygen debt after vigorous exercise? A) The lungs need to recover from breathing fast B) Extra oxygen is needed to break down lactic acid C) Carbon dioxide must be removed from the blood D) The heart rate needs to return to normal Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
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