---
id: kb-2026-00469
title: Photosynthesis
schema_type: TechArticle
category: science
language: en
confidence: medium
last_verified: '2026-05-28'
created_date: '2026-05-22'
generation_method: ai_structured
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-photosynthesis-01
    statement: Photosynthesis converts light energy into chemical energy and uses carbon dioxide and water to build carbohydrate molecules while releasing oxygen.
    source_title: Overview of Photosynthesis - OpenStax Biology 2e
    source_url: https://openstax.org/books/biology-2e/pages/8-1-overview-of-photosynthesis
    confidence: medium
  - id: fact-photosynthesis-02
    statement: The light-dependent reactions occur in the thylakoid membrane and produce ATP and NADPH for later carbon fixation.
    source_title: The Light-Dependent Reactions of Photosynthesis - OpenStax Biology 2e
    source_url: https://openstax.org/books/biology-2e/pages/8-2-the-light-dependent-reactions-of-photosynthesis
    confidence: medium
  - id: fact-photosynthesis-03
    statement: The Calvin cycle uses ATP and NADPH to reduce carbon dioxide into carbohydrate precursors.
    source_title: Using Light Energy to Make Organic Molecules - OpenStax Biology 2e
    source_url: https://openstax.org/books/biology-2e/pages/8-3-using-light-energy-to-make-organic-molecules
    confidence: medium
completeness: 0.82
known_gaps:
  - C4 and CAM pathways are mentioned only at a high level.
disputed_statements: []
primary_sources:
  - title: Overview of Photosynthesis - OpenStax Biology 2e
    type: textbook
    year: 2018
    url: https://openstax.org/books/biology-2e/pages/8-1-overview-of-photosynthesis
    institution: OpenStax
  - title: The Light-Dependent Reactions of Photosynthesis - OpenStax Biology 2e
    type: textbook
    year: 2018
    url: https://openstax.org/books/biology-2e/pages/8-2-the-light-dependent-reactions-of-photosynthesis
    institution: OpenStax
  - title: Using Light Energy to Make Organic Molecules - OpenStax Biology 2e
    type: textbook
    year: 2018
    url: https://openstax.org/books/biology-2e/pages/8-3-using-light-energy-to-make-organic-molecules
    institution: OpenStax
secondary_sources:
  - title: Molecular Mechanisms of Photosynthesis
    type: book
    year: 2021
    authors:
      - Blankenship, Robert E.
    url: https://www.wiley.com/en-us/Molecular+Mechanisms+of+Photosynthesis%2C+3rd+Edition-p-9781119800019
    institution: Wiley
---

## TL;DR

Photosynthesis stores light energy in chemical bonds. In plants, light-dependent reactions generate ATP and NADPH, and the Calvin cycle uses that chemical energy to fix carbon dioxide.

## Core Explanation

The process links energy conversion to the carbon cycle: light reactions capture energy, while carbon-fixation reactions build carbohydrate precursors. C3, C4, and CAM plants differ in how they concentrate or time carbon dioxide fixation, but the article keeps those pathway details secondary.

## Evidence Notes

The previous version mixed in unrelated React documentation and unsupported 2025 review DOIs. This version uses OpenStax Biology for the directly stated textbook-level claims.

## Further Reading

- [Overview of Photosynthesis - OpenStax Biology 2e](https://openstax.org/books/biology-2e/pages/8-1-overview-of-photosynthesis)
- [The Light-Dependent Reactions of Photosynthesis - OpenStax Biology 2e](https://openstax.org/books/biology-2e/pages/8-2-the-light-dependent-reactions-of-photosynthesis)

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