Go through the following Statements
(i) A trophic level represents one species
(ii) Pyramid of energy can never be inverted
(iii) Ecological pyramids hold true only for simply food chains
(iv) Saprophytes are included in the lower most bar in an energy pyramid
Choose the best options regarding them

Options

A. Only (iv) is false
B. (ii) and (iii) are true
C. (i) and (ii) are true
D. All are true

Answer

To solve the question regarding the statements about trophic levels and ecological pyramids, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Statement (i)**: "A trophic level represents one species."
- This statement is **incorrect**. A trophic level refers to a group of organisms that share the same function in the food chain and can include multiple species. For example, primary consumers can include various herbivorous species.

**Hint**: Remember that trophic levels categorize organisms based on their feeding relationships, not by individual species.

2. **Analyze Statement (ii)**: "Pyramid of energy can never be inverted."
- This statement is **correct**. The pyramid of energy is always upright because energy decreases as it moves up trophic levels. Energy is lost at each level, primarily as heat, which prevents the pyramid from being inverted.

**Hint**: Consider how energy flows through an ecosystem and the implications of energy loss at each trophic level.

3. **Analyze Statement (iii)**: "Ecological pyramids hold true only for simple food chains."
- This statement is **correct**. Ecological pyramids are typically based on simple food chains. Complex food webs may include many interactions and decomposers, which can complicate the representation of energy flow.

**Hint**: Think about how complex interactions in ecosystems might affect the clarity of ecological pyramids.

4. **Analyze Statement (iv)**: "Saprophytes are included in the lower most bar in an energy pyramid."
- This statement is **incorrect**. Saprophytes, or decomposers, are usually represented at the higher levels of the energy pyramid, as they break down organic matter and recycle nutrients back into the ecosystem.

**Hint**: Recall the role of decomposers in nutrient cycling and their position in the energy pyramid.

### Conclusion:
- The correct statements are (ii) and (iii).
- Therefore, the best option regarding the statements is **option B**, which states that statements 2 and 3 are true.

### Summary of Correctness:
- Statement (i): False
- Statement (ii): True
- Statement (iii): True
- Statement (iv): False

### Final Answer:
The best option regarding the statements is **option B** (statements 2 and 3 are true).