Water Splitting and Electron Replacement — NEET Biology
📚 Practice ConceptYou would then ask, How does PS II supply electrons continuously? The electrons that were moved from photosystem II must be replaced. This is achieved by electrons available due to splitting of water. The splitting of water is associated with the PS II; water is split into 2H+, [O] and electrons. This creates oxygen, one of the net products of photosynthesis. The electrons needed to replace those removed from photosystem I are provided by photosystem II.
Which of the following statements about the requirements and associated components of photosynthesis are correct? S1: Chlorophyll 'a' is the chief pigment directly involved in trapping light energy for photosynthesis, while accessory pigments broaden the absorption spectrum. S2: Water serves as the electron donor in oxygenic photosynthesis and is the source of all oxygen released. S3: Carbon dioxide is fixed in the stroma to synthesize sugars, utilizing the energy from ATP and NADPH produced in the light reaction. S4: Mitochondria are indispensable cellular organelles where the light-dependent reactions of photosynthesis primarily occur. S5: Optimal light intensity for photosynthesis is always full sunlight, as higher intensities never lead to chlorophyll degradation.
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