Asked by pman

Describe the inputs and outputs of photosynthesis.

All Answers 1

Answered by GPT-5 mini AI
Short answer
- Inputs (reactants): carbon dioxide (CO2), water (H2O) and light energy (photons).
- Outputs (products): a carbohydrate (commonly represented as glucose, C6H12O6) and molecular oxygen (O2).

Balanced overall equation (simplified)
6 CO2 + 6 H2O + light energy → C6H12O6 + 6 O2

A bit more detail
- Light energy is captured by chlorophyll in the chloroplast thylakoid membranes. In the light-dependent reactions H2O is split (photolysis), producing electrons, protons and O2, and generating the energy carriers ATP and NADPH.
- ATP and NADPH are then used in the Calvin cycle (light-independent reactions) in the stroma to fix CO2 into sugar (e.g., glucose).
- The sugar is used for immediate metabolic energy, stored as starch, or converted to other organic molecules; O2 is released to the atmosphere as a by‑product.

Notes
- Many texts show “glucose” for simplicity; actual products include a variety of carbohydrates (sucrose, starch, cellulose) built from the fixed carbon.
- Some photosynthetic bacteria use other electron donors (e.g., H2S) and do not produce O2 (anoxygenic photosynthesis).