The pigment in blue - green algae is .... Which is the same as the one found in green plants . These blue - green algae are ....

Options

A. Pycocyanin , photoautotrophs
B. Heterocysts , Nitrogen fixers
C. All pigments except Chlorophyll a, photoautotrophs
D. Chlorophyll a , photoautotrophs

Answer

To solve the question regarding the pigment in blue-green algae that is the same as the one found in green plants, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Pigment in Blue-Green Algae:**
Blue-green algae, also known as cyanobacteria, contain several pigments. The primary pigment responsible for photosynthesis in blue-green algae is chlorophyll a.

2. **Compare with Green Plants:**
Green plants also contain chlorophyll a as their main pigment for photosynthesis. This similarity indicates that both blue-green algae and green plants utilize chlorophyll a to capture light energy for photosynthesis.

3. **Determine the Nature of Blue-Green Algae:**
Blue-green algae are photoautotrophs, meaning they can produce their own food through the process of photosynthesis, similar to green plants.

4. **Analyze the Options:**
- **Phycocyanin**: This is a pigment found in blue-green algae but not in green plants, so it cannot be the answer.
- **Photoautotrophs**: While blue-green algae are photoautotrophs, this term does not refer to a pigment.
- **Heterocyst**: This refers to a specialized cell in some cyanobacteria for nitrogen fixation and is not related to pigments.
- **All pigments except chlorophyll a**: This option is incorrect because chlorophyll a is the only pigment common to both blue-green algae and green plants.
- **Chlorophyll a photoautotrophs**: This option correctly identifies the pigment (chlorophyll a) and the nature (photoautotrophs) of blue-green algae.

5. **Conclusion:**
The correct answer to the question is **Chlorophyll a photoautotrophs**.

### Final Answer:
The pigment in blue-green algae is **Chlorophyll a**, which is the same as the one found in green plants. These blue-green algae are **photoautotrophs**.