Photosynthesis is a vital biological process in which green plants, algae, and certain bacteria convert carbon dioxide (CO₂) and water (H₂O) into glucose (C₆H₁₂O₆) and release oxygen (O₂) using the energy from sunlight. The source of oxygen released during photosynthesis... Read More
Photosynthesis is a vital biological process in which green plants, algae, and certain bacteria convert carbon dioxide (CO₂) and water (H₂O) into glucose (C₆H₁₂O₆) and release oxygen (O₂) using the energy from sunlight. The source of oxygen released during photosynthesis is water, not carbon dioxide, salts, or glucose.
Light-Dependent Reactions:
Occur in the thylakoid membranes of chloroplasts.
Photolysis of water takes place, where light energy splits water molecules (H₂O) into:
Hydrogen ions (H⁺)
Electrons (e⁻)
Oxygen gas (O₂)
The electrons and hydrogen ions are used in later stages to produce energy-rich molecules (ATP and NADPH).
Release of Oxygen:
The oxygen atoms from water molecules combine to form O₂, which diffuses out of the plant into the atmosphere.
Water acts as an electron donor in the light reactions of photosynthesis.
Without water, plants cannot produce oxygen or drive the formation of sugars efficiently.
This process is fundamental to maintaining Earth’s oxygen balance, supporting life forms that depend on aerobic respiration.
Salts and Minerals: Essential for plant nutrition but do not directly release oxygen.
Glucose: A product of photosynthesis, not a reactant that produces oxygen.
Carbon dioxide: Provides the carbon for glucose, but oxygen atoms from CO₂ remain bound in sugar molecules.
Thus, the correct answer is Option A: Water, as it is the true source of the oxygen released during photosynthesis in plants and algae.
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