The pigment present universally in all green oxygenic plants is

Options

A. Chlorophyll a
B. Chlorophyll b
C. Chlorophyll c
D. Chlorophyll d.

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the pigment that is universally present in all green oxygenic plants.

2. **Understand the Options**: The options provided are:
- A) Chlorophyll A
- B) Chlorophyll B
- C) Chlorophyll C
- D) Chlorophyll D

3. **Know the Role of Chlorophyll**: Chlorophyll is the primary pigment involved in photosynthesis in plants. It is responsible for absorbing light energy, which is essential for the process of photosynthesis.

4. **Analyze Each Option**:
- **Chlorophyll A**: This is the main pigment found in all photosynthetic organisms, including green plants, and is essential for the process of photosynthesis.
- **Chlorophyll B**: This pigment is found in some plants but not universally in all green plants. It is present in aerobic photosynthetic organisms.
- **Chlorophyll C**: This pigment is primarily found in marine algae and is not present in terrestrial plants.
- **Chlorophyll D**: This pigment is found in cyanobacteria and is not universally present in all green plants.

5. **Determine the Correct Answer**: Since chlorophyll A is found in all green oxygenic plants and is considered the universal pigment for photosynthesis, it is the correct answer.

6. **Conclusion**: The pigment present universally in all green oxygenic plants is **Chlorophyll A**.

---