GCSE Biology
Bioenergetics
revision.
Photosynthesis and respiration: equations, organelles, limiting factors and energy transfer.
Bioenergetics guides
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Students type: metabolism definition GCSE Biology
Open guide Revision guideOxygen debtStudents type: oxygen debt GCSE Biology lactic acid
Open guide Revision guideAnaerobic respirationStudents type: anaerobic respiration lactic acid yeast GCSE
Open guide Revision guideAerobic respirationStudents type: aerobic respiration equation GCSE Biology
Open guide Revision guideUses of glucoseStudents type: uses of glucose from photosynthesis GCSE
Open guide Revision guidePhotosynthesis required practicalStudents type: photosynthesis required practical pondweed GCSE
Open guide Revision guideLimiting factors of photosynthesisStudents type: limiting factors photosynthesis graphs GCSE
Open guide Revision guideLeaf structureStudents type: leaf structure palisade stomata GCSE Biology
Open guide Revision guidePhotosynthesis equationStudents type: photosynthesis equation GCSE word and symbol
Open guide Revision guideRespirationStudents type: aerobic respiration equation GCSE
Open guide Revision guidePhotosynthesisStudents type: photosynthesis equation GCSE word and symbol
Open guidePhotosynthesis
The flagship bioenergetics page: word and symbol equations, chloroplasts, limiting factors, uses of glucose and the pondweed practical.
Respiration
Aerobic and anaerobic respiration, mitochondria, oxygen debt, fermentation and why every living cell respires.
Photosynthesis equation
Write the GCSE Biology photosynthesis equations from memory: carbon dioxide and water to glucose and oxygen, endothermic in chloroplasts, and why this is the reverse skeleton of respiration.
Leaf structure
Link leaf tissues to photosynthesis for GCSE Biology: palisade chloroplasts, stomata and guard cells, spongy air spaces, xylem, phloem, and why a thin, broad lamina is an exchange surface.
Limiting factors of photosynthesis
Read photosynthesis graphs for GCSE Biology: rate rises then plateaus as light, carbon dioxide or temperature limits, and why growers change the factor that is actually capping the yield.
Photosynthesis required practical
Plan the GCSE Biology pondweed practical: count oxygen bubbles or collect gas, control temperature and CO₂, vary lamp distance, and use rate as bubbles per minute as a proxy for photosynthesis.
Uses of glucose
Track glucose after photosynthesis for GCSE Biology: respiration, starch storage, cellulose walls, amino acids with nitrate, lipids, and sucrose in the phloem — not “used for energy” as a vague phrase.
Aerobic respiration
Define aerobic respiration for GCSE Biology: glucose plus oxygen to carbon dioxide and water in mitochondria, exothermic energy transfer, and why every living cell — including plants — respires.
Anaerobic respiration
Compare anaerobic respiration for GCSE Biology: lactic acid in animal cells, ethanol and carbon dioxide in yeast and plants, incomplete energy transfer, and why it is used only for short bursts or fermentation.
Oxygen debt
Explain oxygen debt for GCSE Biology: extra oxygen after anaerobic exercise to oxidise lactic acid, why heart and breathing rates stay high, and how this recovery is not “catching your breath” as a vague phrase.
Metabolism
Define metabolism for GCSE Biology as the sum of all reactions in a cell or organism: respiration, synthesis of proteins, starch, glycogen and lipids, and the breakdown reactions that transfer energy.
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