Decomposers like fungi and bacteria are:
i. autotrophs ii. heterotrophs
iii. saprotrophs iv. Chemo-autotrophs
Choose the correct answer:

Options

A. (i) and (iii)
B. (i) and (iv)
C. (ii) and (iii)
D. (i) and (ii)

Answer

To solve the question regarding the classification of decomposers like fungi and bacteria, we need to analyze the definitions of each term provided in the options.

### Step-by-Step Solution:

1. **Understanding Decomposers**: Decomposers are organisms that break down dead organic matter, returning nutrients to the soil. Fungi and bacteria are the primary decomposers in ecosystems.

2. **Analyzing the Options**:
- **i. Autotrophs**: These are organisms that can produce their own food from inorganic substances (e.g., plants through photosynthesis). This does not apply to fungi and bacteria.
- **ii. Heterotrophs**: These organisms cannot synthesize their own food and depend on other sources (plants or animals) for nutrition. This applies to fungi and bacteria as they feed on organic matter.
- **iii. Saprotrophs**: This term specifically refers to organisms that feed on dead and decaying organic matter. Since fungi and bacteria decompose dead material, they fit this category perfectly.
- **iv. Chemo-autotrophs**: These are a type of autotroph that derive energy from chemical reactions to produce their own food. This does not apply to fungi and bacteria.

3. **Conclusion**: Based on the definitions, fungi and bacteria are classified as both heterotrophs and saprotrophs. However, since the question asks for the best classification, the most accurate answer is **iii. saprotrophs**.

### Final Answer:
The correct answer is **iii. saprotrophs**.

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