Which of these is/are limitation/s of ecological pyramids?
I. Decomposers are not given any place in ecological pyramids.
II. Ecological pyramids do not accommodate a food web.
III. Ecological pyramids may be upright or inverted.
IV. They don't consider omnivores in two different trophic levels.

Options

A. III
B. II and IV
C. I, II and IV
D. II, III and IV

Answer

To solve the question regarding the limitations of ecological pyramids, we will evaluate each statement provided:

1. **Statement I: Decomposers are not given any place in ecological pyramids.**
- This statement is true. Ecological pyramids typically focus on producers, primary consumers, and higher trophic levels, but do not include decomposers. Therefore, this is a limitation of ecological pyramids.

2. **Statement II: Ecological pyramids do not accommodate a food web.**
- This statement is also true. Ecological pyramids represent a linear food chain rather than the complex interactions found in a food web. Thus, this is another limitation of ecological pyramids.

3. **Statement III: Ecological pyramids may be upright or inverted.**
- This statement is false. The shape of ecological pyramids (upright or inverted) is a characteristic of the pyramids themselves and does not represent a limitation. For example, pyramids of numbers can be inverted in certain ecosystems, but this does not limit their effectiveness in representing ecological relationships.

4. **Statement IV: They don't consider omnivores in two different trophic levels.**
- This statement is true. Ecological pyramids typically assign omnivores to a single trophic level, which can lead to an oversimplification of their ecological role. Therefore, this is also a limitation of ecological pyramids.

**Conclusion:**
The limitations of ecological pyramids are represented by statements I, II, and IV. Therefore, the correct answer is that statements I, II, and IV are limitations of ecological pyramids.

### Final Answer:
The limitations of ecological pyramids are:
- I. Decomposers are not given any place in ecological pyramids.
- II. Ecological pyramids do not accommodate a food web.
- IV. They don't consider omnivores in two different trophic levels.