The bulk fixation of carbon through photosynthesis takes place in

Options

A. Crop plants
B. Tropical rain forests
C. Ocean
D. Both (1) & (2)

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy, using carbon dioxide (CO2) and water (H2O) to produce glucose and oxygen.

2. **Identifying Carbon Fixation**: Carbon fixation is a crucial part of photosynthesis where CO2 is incorporated into organic molecules. This process primarily occurs in the chloroplasts of plant cells.

3. **Considering Habitats for Photosynthesis**: While photosynthesis occurs in various environments (land, freshwater, and marine), the question specifically asks about the bulk fixation of carbon.

4. **Evaluating Different Ecosystems**:
- **Terrestrial Ecosystems**: These include forests, grasslands, and deserts. While they contribute to carbon fixation, they cover a smaller percentage of the Earth's surface compared to oceans.
- **Aquatic Ecosystems**: Oceans cover about 70% of the Earth's surface and are home to numerous photosynthetic organisms.

5. **Focusing on Marine Photosynthesis**:
- **Phytoplankton**: These microscopic organisms are the primary producers in the ocean and perform photosynthesis, contributing significantly to carbon fixation.
- **Coral Reefs and Other Marine Life**: Other organisms, such as corals and certain bacteria, also contribute to photosynthesis in marine environments.

6. **Conclusion**: Given the vast area of the oceans and the abundance of photosynthetic organisms like phytoplankton, the bulk fixation of carbon through photosynthesis occurs primarily in the oceans.

**Final Answer**: The bulk fixation of carbon through photosynthesis takes place in the ocean.

---