Photosynthesis is important because

Options

A. It is the primary source of all food on earth
B. it is also responsible for the release of oxygen into the atmosphere by green plants
C. it is also responsible for the release of `CO_(2)` into the atmosphere by green plants
D. Both (1) and (2) are correct

Answer

**Step-by-Step Text Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is a biochemical process that occurs in green plants, where they convert light energy (usually from the sun) into chemical energy stored in glucose. This process primarily takes place in the chloroplasts of plant cells.

2. **Primary Source of Food**: The first important reason why photosynthesis is crucial is that it serves as the primary source of all food on Earth. Through photosynthesis, plants synthesize glucose using carbon dioxide (from the atmosphere) and water (from the soil), which forms the basis of the food chain. Herbivores consume plants, and in turn, carnivores consume herbivores, making plants essential for life on Earth.

3. **Release of Oxygen**: The second important reason is that photosynthesis produces oxygen as a byproduct. During the process, water molecules are split (a process known as photolysis), releasing oxygen gas into the atmosphere. This oxygen is vital for the survival of most living organisms, including humans, as it is used in cellular respiration.

4. **Summary of Importance**: Therefore, photosynthesis is important because:
- It is the primary source of food for all organisms on Earth.
- It releases oxygen into the atmosphere, which is essential for respiration in living beings.

5. **Incorrect Options**: Any options suggesting that photosynthesis releases carbon dioxide into the atmosphere are incorrect. While certain processes like photorespiration in C3 plants can release carbon dioxide, this is not a part of the overall photosynthesis process.

6. **Conclusion**: The correct answer to the question is that photosynthesis is important because it is the primary source of food on Earth and it releases oxygen into the atmosphere.

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