Question

Oxygen liberated during photosynthesis comes from

• A. Water
• B. chlorophyll
• C. carbon dioxide
• D. Glucose

Answer 1

The correct option is A

Water

The correct option is option A.

Explanation of correct option:

1. Photosynthesis is when phototrophs convert sunlight into chemical energy, which is then used for cellular power activities.
2. Sugars, made from water and carbon dioxide, are used to collect chemical energy.
3. Water molecules split during photosynthesis to generate oxygen and hydrogen ions.
4. As a result, plants expel oxygen, which is then used to reduce carbon dioxide and produce carbohydrates.
5. Chemical equation of photosynthesis:

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Explanation of incorrect options:

Option B:

1. Chlorophyll, a green pigment found in plants, is responsible for capturing sunlight and supplying energy for such a photosynthetic process.
2. Chlorophyll is a pigment that is used in the photosynthesis process to transform sunlight energy into chemical energy.
3. Chlorophyll absorbs sunlight's power, which is then used to convert carbon dioxide into carbohydrates. This process produces oxygen as a by-product.

Option C:

1. Green plants absorb carbon dioxide CO₂ we exhale through tiny holes under leaves and flowers and branches.

Option D:

1. Glucose C₆H₁₂O₆ and oxygen O₂ gas are the end products of photosynthesis.
2. The plant uses this glucose C₆H₁₂O₆ for energy and stores it as food.
3. The process of respiration releases oxygen, and ATP is synthesized from glucose C₆H₁₂O₆, the energy source for plants.

Final answer: Oxygen liberated during photosynthesis comes from water.