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THE VISUAL LEARNING STUDIO
See the idea. Understand the connection.
35 visual explanations across 29 chapters, with topic maps throughout the library.
The chapter index will grow as additional notes are prepared. Chapters shown here are a learning collection, not a claim that the entire exam syllabus is complete.
SEE IT. CONNECT IT. EXPLAIN IT.
Understand the chapter visually
1 visual explanation · Study the connections, then test yourself.
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FOLLOW THE PROCESS
Photosynthesis: connect the two stages
1
Light + water
Light-dependent reactions occur in thylakoid membranes.
2
ATP + NADPH
These carry usable energy and reducing power to carbon fixation.
3
Carbon dioxide → Calvin cycle
In the stroma, CO₂ is incorporated into organic molecules.
4
Triose phosphate
Some product contributes to carbohydrate synthesis; the rest regenerates RuBP.
The connection Oxygen is released from water during the light-dependent reactions. The Calvin cycle uses ATP and NADPH; it does not directly absorb light.
Exam trap “Light-independent” does not mean the Calvin cycle normally runs only at night.
From which input does the released oxygen originate?
The oxygen released during photosynthesis originates from water.
Study the expanded notes and the credited detailed textbook lessons. The current chapter index covers core topics; it is not a claim of exhaustive coverage of every examination syllabus. Check the official syllabus and primary references.
Nutrition and Photosynthesis — lesson overview
Autotrophic and heterotrophic nutrition
Autotrophs synthesise organic substances from inorganic sources using an energy source. Photoautotrophs use light; other autotrophs can use chemical energy.
Heterotrophs obtain organic nutrients from other organisms or their products. Feeding strategy and energy use are related but distinct aspects of nutrition.
Plants also respire. Photosynthetic ability does not remove their need to release usable chemical energy through cellular metabolism.
Photosynthesis: inputs and processes
In oxygenic photosynthesis, light energy supports conversion of carbon dioxide into organic compounds; water supplies electrons, and oxygen is released from water.
At school level, 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ is a simplified overall equation with light and chlorophyll conditions. The actual pathway contains many reactions rather than one direct step.
Light-dependent reactions occur in the thylakoid membrane system. Carbon-fixation reactions occur in the stroma of chloroplasts, using products of the light reactions.
Gas exchange and transport
Stomata are pores associated with guard cells. Changes in guard-cell turgor regulate pore opening, influencing gas exchange and water loss.
Carbon dioxide supply, light, temperature, and water conditions can affect photosynthetic rate. The limiting factor can change with conditions.
Leaves are adapted for exchange and light capture, but chloroplast-containing tissues elsewhere can also photosynthesise. A diagram should distinguish epidermis, guard cells, stomatal pore, and internal tissue.
