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Photosynthesis: Light and Dark Reactions

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Photosynthesis basics and steps

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Philippines

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Photosynthesis: Light and Dark Reactions
 

Photosynthesis: Light and Dark ReactionsOnline version

Photosynthesis basics and steps

by klaire
1

Slide 1: Overview

Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy stored as glucose.

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Slide 2: Where it happens

Chloroplasts in plant cells capture light. They contain pigments, mainly chlorophyll, which initiate light absorption.

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Slide 3: The overall equation

6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Light energy drives the rearrangement of atoms into glucose and oxygen.

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Slide 4: Light-dependent reactions

Occur in the thylakoid membranes. Light energy excites chlorophyll, driving electrons through an electron transport chain and producing ATP and NADPH.

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Slide 5: Water splitting

Water is split at PSII, releasing electrons, protons, and O₂ gas. This reaction powers the electron transport chain.

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Slide 6: Electron transport chain

Excited electrons move through carriers, creating a proton gradient that fuels ATP synthase to make ATP.

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Slide 7: Photolysis byproduct

As water splits, O₂ is released and protons accumulate in the thylakoid lumen, aiding proton motive force generation.

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Slide 8: Light-independent reactions

Calvin cycle occurs in the stroma using ATP and NADPH to fix CO₂ into sugars like glucose.

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Slide 9: Calvin cycle steps

CO₂ fixation, reduction, and regeneration of RuBP allow continuous CO₂ processing and sugar synthesis.

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Slide 10: Significance

Photosynthesis fuels life on Earth, supports oxygen levels, and forms the base of most food chains.

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