Which one is filter feeder ?

Options

A. Spider
B. Euglena
C. Amoeba
D. Paramecium

Answer

To determine which organism is a filter feeder among the given options, we can analyze each option based on their feeding mechanisms.

### Step-by-Step Solution:

1. **Understand the term "filter feeder":**
- A filter feeder is an organism that feeds by straining suspended matter and food particles from water, typically using specialized structures.

2. **Evaluate the options:**
- **Option 1: Spider**
- Spiders are predators and do not filter feed. They capture prey using webs or by ambush.
- **Option 2: Euglena**
- Euglena is a mixotrophic organism that can photosynthesize and also absorb nutrients but does not filter feed.
- **Option 3: Amoeba**
- Amoeba feeds through phagocytosis, engulfing food particles rather than filtering them.
- **Option 4: Paramecium**
- Paramecium is a ciliated protozoan that uses its cilia to sweep food particles into its oral groove, effectively filtering food from the surrounding water.

3. **Identify the correct answer:**
- Based on the analysis, **Paramecium** is the only organism among the options that is known to be a filter feeder.

### Final Answer:
The correct answer is **Option 4: Paramecium**.