https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:photosynthesis/v/photosynthesis-hs 2022-09-24T04:45:13.131282509Z Photosynthesis The process of photosynthesis converts light energy to stored chemical energy by converting carbon dioxide plus water into sugars plus released oxygen. Photosynthesis occurs in two phases: the light-dependent reactions, and the light-independent reactions. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/c409c933-9296-4895-9892-3a0c2f50b786_1280_720_base.png Photosynthesis The process of photosynthesis converts light energy to stored chemical energy by converting carbon dioxide plus water into sugars plus released oxygen. Photosynthesis occurs in two phases: the light-dependent reactions, and the light-independent reactions. https://cdn.kastatic.org/ka-youtube-converted/Yxm-WMYEpHg.mp4/Yxm-WMYEpHg.mp4 602 Metabolism-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 Metabolism-photosynthesis https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:photosynthesis/a/photosynthesis-overview 2024-05-09T17:42:08.599818576Z An introduction to photosynthesis Learn how some organisms use photosynthesis to convert light energy into chemical energy in food. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:photosynthesis/a/photosynthesis-and-the-environment 2024-07-24T18:36:34.931620222Z Photosynthesis and the environment Learn how photosynthesis affects the environment and how different abiotic factors influence photosynthesis. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:photosynthesis/e/understand-photosynthesis-overview 2024-06-28T21:00:15.59562973Z Understand: photosynthesis Check your understanding of photosynthesis in this set of free, standards-aligned practice questions. Wieteke Holthuijzen 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 https://www.khanacademy.org/science/ap-biology/cellular-energetics/photosynthesis/v/conceptual-overview-of-light-dependent-reactions 2023-05-16T11:42:45.366417523Z Conceptual overview of light dependent reactions During the light-dependent reactions of photosynthesis, light energy excites electrons, which then move through a series of molecules in the thylakoid membrane of chloroplasts. As the electrons move to lower energy states, they help pump hydrogen ions into the thylakoid lumen, creating a concentration gradient. This gradient powers ATP synthase to produce ATP. video https://cdn.kastatic.org/ka_thumbnails_cache/60c124e8-3009-4cd8-970d-e093a235251b_1280_720_base.png Conceptual overview of light dependent reactions During the light-dependent reactions of photosynthesis, light energy excites electrons, which then move through a series of molecules in the thylakoid membrane of chloroplasts. As the electrons move to lower energy states, they help pump hydrogen ions into the thylakoid lumen, creating a concentration gradient. This gradient powers ATP synthase to produce ATP. https://cdn.kastatic.org/ka-youtube-converted/vEsAtC9d_MQ.mp4/vEsAtC9d_MQ.mp4 545 Metabolism-photosynthesis 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/up-biology-grade-11-revision-course-full-term/x01ceb15d0be61009:week-1/x01ceb15d0be61009:untitled-557/e/light-dependent-reactions 2024-08-15T06:11:08.732272473Z Light-dependent reactions This is an exercise on the light reaction of photosynthesis. Moumita Sen exercise https://www.khanacademy.org/science/biology/photosynthesis-in-plants/the-calvin-cycle-reactions/v/photosynthesis-calvin-cycle 2021-03-18T10:33:24Z Photosynthesis: Calvin cycle The Calvin cycle, or the light-independent (dark) reactions of photosythesis. Sal Khan video https://cdn.kastatic.org/googleusercontent/tnj6USkA_iFdPEvFZWIOv2Nl6WnJCqTcdvG3Y7EwFnKzbrLQaKrzLCQStYCDEdQHQCzpNYbj4HHwArZdqyIj7DyP8A Photosynthesis: Calvin cycle The Calvin cycle, or the light-independent (dark) reactions of photosythesis. https://cdn.kastatic.org/ka-youtube-converted/slm6D2VEXYs.mp4/slm6D2VEXYs.mp4 808 Metabolism-photosynthesis 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/up-biology-grade-11-revision-course-full-term/x01ceb15d0be61009:week-1/x01ceb15d0be61009:untitled-557/e/calvin-cycle 2024-08-15T06:11:08.732272473Z Calvin cycle This exercise contains questions on the Calvin cycle. Moumita Sen exercise