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First photosynthetic organisms to appear...

First photosynthetic organisms to appear on earth were

A

bacteria

B

green algae

C

cyanobacteria

D

bryophytes

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the first photosynthetic organisms that appeared on Earth. This requires knowledge of the timeline of Earth's history and the evolution of photosynthesis. 2. **Formation of Earth**: Earth was formed approximately 4.6 billion years ago. This is the starting point for understanding the timeline of life on Earth. 3. **First Photosynthetic Organisms**: Around 3.4 billion years ago, the first photosynthetic bacteria appeared. These organisms were crucial in the development of photosynthesis. 4. **Cyanobacteria**: By about 2.7 billion years ago, cyanobacteria emerged. They are significant because they were the first organisms known to produce oxygen through photosynthesis. 5. **Oxygen in the Atmosphere**: Evidence of oxygen in the atmosphere began to appear around 2.4 to 2.3 billion years ago, indicating that the photosynthetic activity of cyanobacteria was contributing to the oxygenation of the atmosphere. 6. **Conclusion**: The first photosynthetic organisms on Earth were bacteria, and cyanobacteria were the first to produce oxygen. **Final Answer**: The first photosynthetic organisms to appear on Earth were bacteria. ---
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