Photosynthesis: Role of Water & Van Niel Hypothesis | Class 11 Biology New Book

Role of water in photosynthesis, Van Niel hypothesis, water splitting (photolysis), and oxygen evolution explained in detail for Class 11 Biology (Bioenergetics, New Syllabus 2025). In this lecture we cover: Role of Water in Photosynthesis – as an electron donor and hydrogen source Photolysis of Water – splitting of water into oxygen, protons, and electrons during light reactions Van Niel Hypothesis – proving that O₂ released comes from water, not carbon dioxide Experimental Evidence by Van Niel – using purple and green sulfur bacteria Importance of Water in Bioenergetics – energy transfer and maintaining electron flow Exam-focused explanation with diagrams for Class 11, MDCAT, and NEET This lecture is useful for: Class 11 Biology (New Book 2025) Board Exams preparation MDCAT & NEET Biology Bioenergetics & Photosynthesis core concepts 👉 Watch the full Bioenergetics Playlist for ATP, Photosynthesis, Respiration, and more. #Photosynthesis #Class11Biology #RoleOfWater #VanNielHypothesis #Photolysis #Bioenergetics #MDCATBiology #NEETBiology #BiologyLecture #Biology2025