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Understanding Photosynthesis: Equations and Glucose Uses

Bioenergetics • Photosynthesis

Key concepts

What you'll likely be quizzed about

  • Photosynthesis is a chemical reaction that stores energy from light in the bonds of glucose.
  • It occurs in chloroplasts containing chlorophyll.
  • Chlorophyll absorbs light, transferring energy to the reactions inside the chloroplasts, requiring light as an input.
  • Because energy is absorbed from the environment, photosynthesis is classified as an endothermic reaction.

Flashcards

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Why does photosynthesis support almost all life on Earth?

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Photosynthesis converts light energy into chemical energy stored in organic molecules, forming the base of most food chains and providing atmospheric oxygen.

Key notes

Important points to keep in mind

Photosynthesis occurs in chloroplasts where chlorophyll absorbs light energy.

Word equation: carbon dioxide + water → glucose + oxygen. Symbol equation: 6CO2 + 6H2O → C6H12O6 + 6O2.

Photosynthesis is endothermic because energy is absorbed and stored in product bonds.

Five main uses of glucose: respiration, starch storage, fats/oils, cellulose, and amino acids/protein synthesis (requires nitrates).

Limiting factors: light, carbon dioxide, temperature, and chlorophyll amount; addressing the limiting factor increases rate.

Glucose moves from leaves to other tissues via phloem (translocation) as soluble sugars.

Starch is insoluble, making it suitable for safe long-term carbohydrate storage in plants.

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