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Which "photosythetic bacteria" possess b...

Which "photosythetic bacteria" possess both `PS` I and `PS` II

A

Purple sulphur bacteria

B

Cyanobacteria

C

Purple nonsulphur bacteria

D

Green sulphur bacteria.

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Photosynthetic Bacteria:** - Photosynthetic bacteria are organisms that can produce their own food through the process of photosynthesis, utilizing sunlight as an energy source. 2. **Types of Photosynthetic Bacteria:** - There are three main types of photosynthetic bacteria: - Cyanobacteria - Purple bacteria (including purple sulfur and purple non-sulfur bacteria) - Green bacteria (including green sulfur bacteria) 3. **Identifying Photosystems:** - Photosystems are complexes in the photosynthetic process. There are two types: - Photosystem I (PS I) - Photosystem II (PS II) - Both PS I and PS II are essential for oxygenic photosynthesis, which is the type of photosynthesis that produces oxygen. 4. **Analyzing the Options:** - **Purple Sulfur Bacteria:** These primarily utilize PS II and do not possess both PS I and PS II. - **Cyanobacteria:** These are known to possess both PS I and PS II, similar to higher plants, and perform oxygenic photosynthesis. - **Purple Non-Sulfur Bacteria:** These mainly use PS I and do not have PS II. - **Green Sulfur Bacteria:** These have a reaction center similar to PS I but do not possess both PS I and PS II. 5. **Conclusion:** - The only photosynthetic bacteria that possess both PS I and PS II are **Cyanobacteria**. They perform oxygenic photosynthesis, using water as an electron donor, which results in the generation of oxygen. **Final Answer: Cyanobacteria** ---
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