Which of the following statements regarding slime moulds is true ?

Options

A. They show autotrophic mode of nutrition.
B. The spores produced by them in harsh environments, possess true walls.
C. Slime moulds form aggregation called vegetation.
D. The spores produced by them require water for dispersal.

Answer

To determine which statement regarding slime molds is true, we need to analyze the characteristics of slime molds and evaluate each statement provided.

### Step-by-Step Solution:

1. **Understanding Slime Molds**:
- Slime molds are classified as heterotrophic organisms. This means they cannot produce their own food and must obtain it from other organic sources.

2. **Evaluating the Statements**:
- **Statement 1**: "They show autotrophic mode of nutrition."
- This statement is false because slime molds are heterotrophs, not autotrophs. They do not synthesize their own food.

- **Statement 2**: "The spores produced by them in harsh environments possess true walls."
- This statement is true. Slime molds can produce spores with true walls when they encounter harsh environmental conditions. This adaptation helps them survive in unfavorable conditions.

- **Statement 3**: "They form aggregations."
- This statement is misleading. While slime molds can aggregate during certain life stages, they are primarily free-living organisms and do not always live in aggregation.

- **Statement 4**: "The spores produced by them require water for dispersal."
- This statement is false. Slime molds are adapted to dry environments, and their spores do not require water for dispersal.

3. **Conclusion**:
- The only true statement regarding slime molds is that "the spores produced by them in harsh environments possess true walls." Therefore, the correct answer is option number 2.