Phycoerythrin is present in a. Euglena b. polysiphonia c. Chlamydomonas d. fucus

Options

A. Euglena
B. Polysiphonia
C. Chlamydomonas
D. fucus.

Explanation

To determine which organism contains phycoerythrin, we can follow these steps:

### Step 1: Understand what phycoerythrin is
Phycoerythrin is an accessory photosynthetic pigment that aids in the process of photosynthesis. It is a red-colored protein pigment complex produced by a phycobilin protein family.

**Hint:** Remember that phycoerythrin is specifically associated with certain types of algae.

### Step 2: Identify the types of organisms in the options
We have four options:
a. Euglena
b. Polysiphonia
c. Chlamydomonas
d. Fucus

### Step 3: Analyze each option
- **Option A: Euglena**
Euglena is a protozoan and does not contain phycoerythrin.

- **Option B: Polysiphonia**
Polysiphonia is a type of red algae, which is known to contain phycoerythrin.

- **Option C: Chlamydomonas**
Chlamydomonas is a green algae and does not have phycoerythrin.

- **Option D: Fucus**
Fucus is a brown algae and also does not contain phycoerythrin.

### Step 4: Conclusion
Based on the analysis, the only organism from the options that contains phycoerythrin is **Polysiphonia**.

**Final Answer:** b. Polysiphonia