GCSE Biology
Bioenergetics
Bioenergetics is a core strand in Biology. Work through the topics below in any order, or follow your course — each guide includes explanations, common mistakes and exam-style practice.
Topic guides
Photosynthesis
Photosynthesis is not just a word equation to memorise.
Open guideLimiting Factors of Photosynthesis
The rate of photosynthesis is limited by the factor that is in shortest supply.
Open guideRespiration
Respiration is one of the easiest Biology topics to partly understand and still lose marks on.
Open guideAerobic & Anaerobic Respiration
Aerobic respiration uses oxygen to release a large amount of energy from glucose, producing carbon dioxide and water as waste products.
Open guideExercise & Oxygen Debt
During intense exercise, the body may not be able to supply enough oxygen to the muscles for aerobic respiration.
Open guide
Revision strategy
Students often slip on the details explained in our guides — read the “common mistakes” section in each topic.
- Alternate between reading a guide and doing timed questions — don’t only re-read notes.
- Return to this hub anytime; new guides appear automatically as we publish them.