Question

Which of the following statements is INCORRECT about ecological pyramids?

• A. All pyramids are always upright
• B. They represent trophic structure and function.
• C. Energy pyramids are always upright
• D. In aquatic ecosystem, the biomass pyramid may be inverted

Hint:

Only the energy pyramid is always upright. Biomass and number pyramids can sometimes be inverted.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Ecological pyramids show numbers, biomass or energy at each trophic level, so they depict trophic structure and function.

Step 2: Check statements
The energy pyramid is always upright because only about 10 percent of energy passes on at each step.
In the sea the biomass pyramid can be inverted because phytoplankton have a small standing crop.
A pyramid of numbers is inverted for a tree with many insects.

Step 3: Conclusion
Not all pyramids are upright, so statement A is incorrect.

Final Answer:
The incorrect statement is that all pyramids are always upright. \[ \boxed{\text{(A) }\text{All pyramids are always upright}} \]