Consider the following statements 1 The steps of trophic levels expres...........

Environment and Ecology Concept of Ecosystems

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Consider the following statements.

1. The steps of trophic levels expressed in a diagrammatic way are referred to as ecological pyramids.

2. The pyramid of biomass shall always be upright.

3. The pyramid of number can be both upright and inverted.

4. The pyramid of biomass is measured in gm/m.

Which of the above statements are correct?

1 and 3 only

1, 2 and 4 only

1, 2 and 3 only

1, 3 and 4 only

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Explanation:

Ecological pyramids are diagrammatic representation of trophic levels arrange one over the other. There are three types of ecological pyramid: pyramid of energy, pyramid of numbers and pyramid of biomass. As we all know that energy flow across trophic levels is unidirectional therefore, the energy pyramid will always be upright whereas pyramid of biomass and pyramid of numbers may be upright or bottom up. Therefore option A as the answer is justified.