What term is used for the diagram that displays the number of organisms at each trophic level?

• A. Predator
• B. Quantitative study
• C. Scramble competition
• D. Pyramid of numbers

Answer: (D)

This question tests how we visualize the number of organisms at each trophic level. The diagram used for this purpose is the pyramid of numbers. In a pyramid of numbers, the width of each block represents how many individuals exist at that level, starting with producers at the base and moving up to higher trophic levels. It helps illustrate how energy transfer between levels is inefficient, so the number of organisms generally decreases at higher levels, producing a pyramid-like shape. While some ecosystems can have unusual patterns, the standard term for this diagram that shows counts across trophic levels is pyramid of numbers. The other terms don’t describe a diagram: a predator is an organism that hunts, a quantitative study is a data collection method, and scramble competition is a form of competition.