https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-organisms/x0c5bb03129646fd6:photosynthesis-in-organisms/v/ms-photosynthesis-in-organisms 2022-09-10T03:04:58.582913383Z Photosynthesis in organisms Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/993fd959-83e3-42f4-8424-f1e303d214b8_1280_720_base.png Photosynthesis in organisms Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use. https://cdn.kastatic.org/ka-youtube-converted/_BLShUdXbN4.mp4/_BLShUdXbN4.mp4 241 Photosynthesis https://www.khanacademy.org/science/biology/photosynthesis-in-plants/the-light-dependent-reactions-of-photosynthesis/v/light-dependent-reactions-actors 2022-10-05T08:04:52.620007339Z Light dependent reactions actors More detailed description of the various molecular actors in the light dependent reactions. video https://cdn.kastatic.org/ka_thumbnails_cache/03c335dd-8797-4432-942d-a3aac86ed683_1280_720_base.png Light dependent reactions actors More detailed description of the various molecular actors in the light dependent reactions. https://cdn.kastatic.org/ka-youtube-converted/KzpRivhr6HI.mp4/KzpRivhr6HI.mp4 398 Photosynthesis https://www.khanacademy.org/science/ap-biology/cellular-energetics/photosynthesis/v/breaking-down-photosynthesis-stages 2024-05-08T18:05:37.173521444Z Breaking down photosynthesis stages Photosynthesis, a process vital for life, involves two main stages: light-dependent reactions and the light-independent reactions (also called the Calvin cycle). Light-dependent reactions use light energy and water to produce ATP, NADPH, and oxygen. Light-independent reactions then uses ATP, NADPH, and carbon dioxide to create sugar. This process transforms light energy into a usable form, supporting life on Earth. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/cc3a540a-9d70-4b7b-81a6-7a577d5c4ed8_1280_720_base.png Breaking down photosynthesis stages Photosynthesis, a process vital for life, involves two main stages: light-dependent reactions and the light-independent reactions (also called the Calvin cycle). Light-dependent reactions use light energy and water to produce ATP, NADPH, and oxygen. Light-independent reactions then uses ATP, NADPH, and carbon dioxide to create sugar. This process transforms light energy into a usable form, supporting life on Earth. https://cdn.kastatic.org/ka-youtube-converted/Wt5EMpUt-_g.mp4/Wt5EMpUt-_g.mp4 288 Photosynthesis https://www.khanacademy.org/science/ap-biology/cellular-energetics/photosynthesis/v/photosynthesis 2022-11-16T04:22:43.7414897Z Photosynthesis Photosynthesis is essential for life on Earth. Photosynthesis involves two stages: the light-dependent reactions, which require sunlight and water to produce oxygen, ATP, and NADPH, and the light-independent reactions (or "dark reactions"), which use the products of the light-dependent reactions along with carbon dioxide to produce carbohydrates. Sal Khan video https://cdn.kastatic.org/googleusercontent/j_VtfkzgOpNbsv7JemuDeDS97LZKI7ZC8RIkPt6cuP5EVn0mb9KRFvsEabbBaOgSXSvbliJ5ekyFEvERUcbWx5sl Photosynthesis Photosynthesis is essential for life on Earth. Photosynthesis involves two stages: the light-dependent reactions, which require sunlight and water to produce oxygen, ATP, and NADPH, and the light-independent reactions (or "dark reactions"), which use the products of the light-dependent reactions along with carbon dioxide to produce carbohydrates. https://cdn.kastatic.org/ka-youtube-converted/-rsYk4eCKnA.mp4/-rsYk4eCKnA.mp4 817 Photosynthesis https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:plant-nutrition/x2a084a90105205d2:photosynthesis/v/photosynthesis-pk 2026-04-17T11:10:45.679633951Z Photosynthesis Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Photosynthesis Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/hOFZ4RDZIE0.mp4/hOFZ4RDZIE0.mp4 824 Photosynthesis https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-organisms/x0c5bb03129646fd6:photosynthesis-in-organisms/a/photosynthesis-in-organisms 2026-04-22T04:30:43.362363602Z Key points: Photosynthesis in organisms Review your understanding of photosynthesis in organisms with this free article aligned to NGSS standards. article https://www.khanacademy.org/science/ap-biology/cellular-energetics/photosynthesis/a/hs-photosynthesis-review 2021-04-29T07:58:59Z Photosynthesis review article https://www.khanacademy.org/science/ap-biology/cellular-energetics/photosynthesis/a/light-dependent-reactions 2023-08-07T17:09:37.131449861Z The light-dependent reactions How light energy is used to make ATP and NADPH. Photosystems I and II. Reaction center chlorophylls P700 and P680. article https://www.khanacademy.org/science/ap-biology/cellular-energetics/photosynthesis/a/calvin-cycle 2023-11-17T19:19:16.015325494Z The Calvin cycle How the products of the light reactions, ATP and NADPH, are used to fix carbon into sugars in the second stage of photosynthesis. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-organisms/x0c5bb03129646fd6:photosynthesis-in-organisms/e/understand-photosynthesis-in-organisms 2026-02-27T20:00:43.673916617Z Understand: photosynthesis in organisms Check your understanding of photosynthesis in organisms in this set of free practice questions aligned to NGSS standards. Megan Cohn exercise https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-organisms/x0c5bb03129646fd6:photosynthesis-in-organisms/e/apply-photosynthesis-in-organisms 2026-02-27T17:50:36.702607024Z Apply: photosynthesis in organisms Apply your understanding of photosynthesis in organisms in this set of free practice questions aligned to NGSS standards. Khan Academy exercise https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:plant-nutrition/x2a084a90105205d2:photosynthesis/e/chloroplast 2025-11-01T08:31:36.421773631Z Chloroplast This exercise explores the structure and function of chloroplasts, the plastids responsible for photosynthesis. Students will learn about types of plastids, chloroplast structure (thylakoids, grana, stroma), and their role in energy conversion and pigment formation, linking to the endosymbiotic theory of origin. Khan Academy exercise https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:plant-nutrition/x2a084a90105205d2:photosynthesis/e/overview-of-photosynthesis 2022-11-18T12:00:57.983091387Z Overview of photosynthesis This exercise has general questions on photosynthesis. Moumita Sen exercise https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:photosynthesis/e/apply-photosynthesis 2026-03-18T10:10:31.931963487Z Apply: photosynthesis Apply your understanding of photosynthesis in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise