Answer: The balance of chemical elements (C, N, P) within and between organisms and their environment, affecting food webs and nutrient cycling.
- A The genetic structure and allele frequencies present within a population, a description of population genetics rather than elemental nutrient ratios
- B The balance of chemical elements (C, N, P) within and between organisms and their environment, affecting food webs and nutrient cycling
- C Mainly the cycling of carbon between the atmosphere and living organisms, ignoring nitrogen and phosphorus ratios that actually define this concept
- D Mainly the dynamics of dissolved oxygen within aquatic ecosystems, a narrower topic unrelated to the elemental balance this term describes
Correct answer: B. The balance of chemical elements (C, N, P) within and between organisms and their environment, affecting food webs and nutrient cycling
Explanation: Ecological stoichiometry: studies how elemental ratios (C:N:P) affect ecological processes. Mismatch between food and consumer elemental requirements (homeostasis) influences growth efficiency and nutrient recycling.
Energy pyramid showing a simple food chain (producer to herbivore to carnivore) with energy decreasing roughly tenfold at each trophic level.
Concept context
Ecosystems, food chains, energy flow, nutrient cycles, biodiversity, and conservation.