Diatoms resemble dinoflagellates in having

Options

A. contractile vacuoles
B. flagella
C. fucoxanthin
D. lipids

Answer

To solve the question "Diatoms resemble dinoflagellates in having," we need to identify the common characteristics shared by both diatoms and dinoflagellates. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Organisms
- **Diatoms**: These are unicellular organisms that belong to the group of algae. They are known for their unique silica cell walls.
- **Dinoflagellates**: These are also unicellular organisms and are characterized by having two flagella. They are a type of eukaryotic algae.

**Hint**: Look for the defining features of both diatoms and dinoflagellates to find their similarities.

### Step 2: Determine the Common Characteristics
- Both diatoms and dinoflagellates are **eukaryotic algae**, meaning they have complex cells with a nucleus.
- They share a **golden brown color**, which is a key characteristic that can help in identifying them.

**Hint**: Think about the pigments that contribute to their coloration.

### Step 3: Identify the Pigment Responsible for Color
- The golden brown color in both diatoms and dinoflagellates is due to the presence of **fucoxanthin**, which is a type of xanthophyll pigment. This pigment is an accessory pigment that helps in photosynthesis by capturing light energy.

**Hint**: Consider what pigments are found in both groups and how they affect their appearance.

### Step 4: Conclusion
- Therefore, the correct answer to the question is that diatoms resemble dinoflagellates in having **fucoxanthin**.

**Final Answer**: Diatoms and dinoflagellates resemble each other in having **fucoxanthin**.