Photosynthesis: Light and Dark Reactions

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Photosynthesis basics and steps

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klaire

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Photosynthesis: Light and Dark ReactionsVersión en línea Photosynthesis basics and steps por 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. 2 Slide 2: Where it happens Chloroplasts in plant cells capture light. They contain pigments, mainly chlorophyll, which initiate light absorption. 3 Slide 3: The overall equation 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Light energy drives the rearrangement of atoms into glucose and oxygen. 4 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. 5 Slide 5: Water splitting Water is split at PSII, releasing electrons, protons, and O₂ gas. This reaction powers the electron transport chain. 6 Slide 6: Electron transport chain Excited electrons move through carriers, creating a proton gradient that fuels ATP synthase to make ATP. 7 Slide 7: Photolysis byproduct As water splits, O₂ is released and protons accumulate in the thylakoid lumen, aiding proton motive force generation. 8 Slide 8: Light-independent reactions Calvin cycle occurs in the stroma using ATP and NADPH to fix CO₂ into sugars like glucose. 9 Slide 9: Calvin cycle steps CO₂ fixation, reduction, and regeneration of RuBP allow continuous CO₂ processing and sugar synthesis. 10 Slide 10: Significance Photosynthesis fuels life on Earth, supports oxygen levels, and forms the base of most food chains.

Photosynthesis: Light and Dark ReactionsVersión en línea

Photosynthesis basics and steps

por klaire

Slide 1: Overview

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

Slide 2: Where it happens

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

Slide 3: The overall equation

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

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.

Slide 5: Water splitting

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

Slide 6: Electron transport chain

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

Slide 7: Photolysis byproduct

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

Slide 8: Light-independent reactions

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

Slide 9: Calvin cycle steps

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

Slide 10: Significance

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

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