Which term describes each step in a food chain that demonstrates the transfer of energy?

• A. Ecological niche
• B. Trophic level
• C. Biogeochemical cycle
• D. Population

Answer: (B)

Verified step by step guidance

1. Understand the concept of a food chain: A food chain represents the flow of energy and nutrients through different organisms in an ecosystem, starting from producers (like plants) to various levels of consumers (like herbivores, carnivores, and decomposers).
2. Define the term 'trophic level': A trophic level refers to each step in a food chain or food web, where organisms are grouped based on their role in the transfer of energy. For example, producers occupy the first trophic level, primary consumers the second, and so on.
3. Differentiate between the given terms: 'Ecological niche' refers to the role or position an organism has in its environment, 'Biogeochemical cycle' describes the movement of elements like carbon or nitrogen through ecosystems, and 'Population' refers to a group of individuals of the same species in a specific area. None of these terms describe energy transfer in a food chain.
4. Relate the correct term to the food chain: The term 'trophic level' specifically describes the hierarchical steps in a food chain where energy is transferred from one group of organisms to another.
5. Conclude that 'trophic level' is the correct term to describe each step in a food chain that demonstrates the transfer of energy.