Read the following paragraph about an organism .
These organisms are unicellular eukaryotes . Their body moves
along decaying twigs and leaves engulfing organic material . Under suitable conditions, they from an aggregation called plasmodium
which may grow and spread over several feet . During unfavorable conditions, the plasmodium differentiates and forms fruiting bodies bearing spores at their tips
Which of the following organism does it ?

Options

A. Protozoa
B. Euglenoids
C. Fungi
D. Slime moulds

Answer

To solve the question regarding the organism described in the paragraph, we will analyze the characteristics mentioned step by step.

### Step 1: Identify the Key Characteristics
The paragraph describes an organism with the following key characteristics:
- Unicellular eukaryotes
- Moves along decaying twigs and leaves, engulfing organic material
- Forms an aggregation called plasmodium under suitable conditions
- Differentiates to form fruiting bodies with spores during unfavorable conditions

### Step 2: Analyze the Options
We have four options to consider:
1. Protozoa
2. Euglenoids
3. Fungi
4. Slime molds

### Step 3: Evaluate Each Option
1. **Protozoa**:
- Protozoa are unicellular eukaryotes, but they primarily exhibit heterotrophic nutrition. They do not typically form plasmodium or fruiting bodies as described in the paragraph. Therefore, this option can be ruled out.

2. **Euglenoids**:
- Euglenoids can be both autotrophic and heterotrophic. However, they do not form plasmodium or fruiting bodies. This option is also incorrect.

3. **Fungi**:
- Fungi are multicellular eukaryotes (with some unicellular forms like yeast) and primarily decompose organic material, but they do not form plasmodium or the specific type of fruiting bodies described. Hence, this option is not suitable.

4. **Slime molds**:
- Slime molds are indeed unicellular eukaryotes that can move and engulf organic material. They form a plasmodium under favorable conditions and can differentiate into fruiting bodies during unfavorable conditions. This matches all the characteristics described in the paragraph.

### Step 4: Conclusion
Based on the analysis, the organism described in the paragraph is best represented by **slime molds**.

### Final Answer:
**Slime molds**

---