Which of the following plant groups have similar pigment compositon ?

Options

A. Rhodophyta and phaeophyta
B. Chlorophyta and phaeophyta
C. Rhodophyta and cyanophyta
D. All of the above

Answer

To determine which plant groups have similar pigment composition, we need to analyze the pigments present in each group mentioned in the options.

### Step-by-Step Solution:

1. **Identify the Pigments in Each Group:**
- **Pheophyta (Brown Algae):**
- Contains chlorophyll a
- Contains chlorophyll c
- Contains carotene
- Contains xanthophyll
- **Rhodophyta (Red Algae):**
- Contains chlorophyll a
- Contains chlorophyll d
- Contains carotene
- Contains phycoerythrin
- Contains phycocyanin
- **Chlorophyta (Green Algae):**
- Contains chlorophyll a
- Contains chlorophyll b
- Contains carotene
- Contains xanthophyll
- **Cyanophyta (Blue-Green Algae):**
- Contains chlorophyll a
- Contains chlorophyll d
- Contains carotene
- Contains phycoerythrin
- Contains phycocyanin

2. **Compare the Pigment Composition:**
- **Rhodophyta and Cyanophyta:**
- Both contain chlorophyll a, carotene, and phycoerythrin.
- **Pheophyta and Chlorophyta:**
- Pheophyta has chlorophyll a, chlorophyll c, and xanthophyll, while Chlorophyta has chlorophyll a, chlorophyll b, and xanthophyll. They do not share similar pigments.
- **Rhodophyta and Pheophyta:**
- They have different pigments, as Rhodophyta has chlorophyll d and phycoerythrin, while Pheophyta has chlorophyll c and xanthophyll.
- **Chlorophyta and Pheophyta:**
- They do not have similar pigment composition.

3. **Conclusion:**
- The only group that shares similar pigments is **Rhodophyta and Cyanophyta**. Therefore, the correct answer is **option C: Rhodophyta and Cyanophyta**.

### Final Answer:
**C: Rhodophyta and Cyanophyta**