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BIOLOGY A LEVEL SUMMARY NOTES AQA
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Topic 5APhotosynthesis & Respiration
ABK
, Why energy? Respiration and energy
o Biological processes to occur o Releasing of energy from glucose
o Plants – photosynthesis, active transport, DNA Aerobic
replication, cell division & protein synthesis o Glucose + Oxygen → Carbon dioxide + W
o Animals- all above, muscle contraction, Anaerobic
homeostasis o Glucose = ethanol + carbon dioxide + en
o Humans- produces lactate
Photosynthesis and energy o Both metabolic pathways
o Process where energy from light used to make
glucose from h20 & co2 ATP
o Light energy converted into glucose o Energy released from glucose to make A
o 6CO2 + 6H20 + LE = C6H12O6 + 602 o Phosphorylation – ADP + Pi = ATP
o Energy stored in glucose until respiration o Reverse is hydrolysis
o Animals obtain glucose by eating plants, then
respire glucose to release energy ATP Properties
o Photoautotroph- organism that carries out PS o Stores/releases small amount of energy,
o PS example of metabolic pathway – process heat
Photosynthesis, o Small soluble, easily transported
occurs in series of small reactions controlled
by enzymes
Respiration & Energy o Easily broken down, energy released inst
o Quickly remade
o Make other molecules more reactive by
Compensation point o Can’t pass out of cell, so cell has immedi
o Particular level of light intensity at which rate energy
of PS matches rate of resp.
o CP different for different species of plant
o Photosynthesis/respiration, same time,
different rate
o Working out CP:
o Measure rate of 02 production & used by plant
at different light intensity
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