Maximum `O_(2)` evolution occurs from

Options

A. forests
B. marine phytoplankton
C. crops
D. land mass

Answer

To determine where the maximum O2 evolution occurs, we need to analyze the contributions of different sources to oxygen production. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Sources of Oxygen
- Oxygen is produced through the process of photosynthesis, primarily by plants, algae, and certain bacteria.
- The main contributors to oxygen production include forests, marine phytoplankton, crops, and landmass.

### Step 2: Analyze Each Source
- **Forests**: They are significant contributors to oxygen production, accounting for approximately 80% of the total oxygen in the atmosphere.
- **Marine Phytoplankton**: These microscopic organisms in oceans and seas are responsible for about 70% of the oxygen production. They perform photosynthesis using sunlight, carbon dioxide, and water.
- **Crops**: Agricultural crops contribute around 12% to the total oxygen production.
- **Landmass**: This term refers to the physical land area where various plants grow, including forests and crops. However, landmass itself does not produce oxygen; it is the plants on it that do.

### Step 3: Compare the Contributions
- While forests contribute a substantial amount of oxygen, marine phytoplankton have a unique advantage due to their vast numbers and the extensive surface area of oceans, which allows them to produce a significant amount of oxygen through photosynthesis.

### Step 4: Conclusion
- Based on the analysis, the maximum oxygen evolution occurs from marine phytoplankton, as they are responsible for a large portion of the oxygen produced in the world.

### Final Answer
The maximum O2 evolution occurs from **marine phytoplankton**.

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