Question

Oxygen liberated during photosynthesis comes from

A
Water
B
Chlorophyll
C
Carbon dioxide
D
Glucose

Solution

The correct option is A WaterHint: Water is the source of electrons and hydrogen ions during photosynthesis.Part 1 - Definition - PhotosynthesisPhotosynthesis is the process of preparing food in the presence of sunlight and chlorophyll. In this process, the plant uses water from the soil, carbon dioxide from the air and energy from sunlight to prepare glucose.  $$Carbon$$ $$dioxide$$ + $$Water$$ + $$light$$ $$energy$$ $$\rightarrow$$ $$Glucose$$ + $$Oxygen$$Part 2 - Role of water as Electron FeederDuring the light reaction of photosynthesis, when chlorophyll molecules absorb light their electrons get excited and leave the chlorophyll molecule to enter an electron transport system. In the end, these electrons are absorbed by $$NADPH^+$$.To replace those electrons lost from chlorophyll, water molecule undergo photolysis.The reaction proceeds as follows: $$H_2O$$  $$\rightarrow$$  $$2H^+$$   +  $$2e^-$$   +  $$1/2O_2$$So, water provides electrons to replace those removed from chlorophyll.Part 3 - Role of water as Oxygen ProviderDuring the photolysis of water, oxygen is released as a side product.This oxygen is released into the environment through stomata.Part 4 - ConclusionFrom the above discussion, we can conclude that water serves as a source of protons and electrons during photosynthesis, while oxygen is released as a waste product.Final step- Oxygen liberated during photosynthesis comes from water.Biology

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