What does a pyramid of numbers show in an ecosystem?

• A. The number of individual organisms at each trophic level
• B. The rate of photosynthesis at each trophic level
• C. The total biomass present at each trophic level
• D. The total energy available at each trophic level

Answer: (A)

Verified step by step guidance

1. Understand the concept of a pyramid of numbers: A pyramid of numbers is a graphical representation that shows the number of individual organisms at each trophic level in an ecosystem.
2. Recall the structure of trophic levels: Trophic levels represent the hierarchical positions in a food chain, starting with producers (like plants) at the base, followed by primary consumers (herbivores), secondary consumers (carnivores), and so on.
3. Differentiate between pyramids of numbers, biomass, and energy: A pyramid of numbers focuses on the count of organisms, while a pyramid of biomass represents the total mass of organisms, and a pyramid of energy shows the energy flow at each trophic level.
4. Analyze the options provided: The correct answer should align with the definition of a pyramid of numbers, which is specifically about the number of individual organisms at each trophic level.
5. Conclude that the pyramid of numbers does not measure photosynthesis rates, biomass, or energy availability, but rather the count of organisms at each trophic level.