How does a food web differ from a simple food chain?

• A. A food web shows many interconnected feeding relationships, while a chain is a single linear path.
• B. A food web concerns nutrient cycles, while a chain concerns energy flow.
• C. A food web has fewer species than a chain.
• D. A food web is static, while a chain changes over time.

Answer: (A)

A food web maps many interconnected feeding relationships among producers, consumers, and decomposers, so energy can move along multiple routes through the community. A simple food chain, by contrast, follows one straight line: one organism is eaten by one consumer, who is eaten by another, and so on. This makes the chain a tidy, linear path that leaves out alternative prey and predators.

That interconnected network is the key idea. Real ecosystems are intricate networks where species can have multiple predators and multiple prey, and energy flows through several pathways rather than a single sequence.

Why the other ideas don’t fit: nutrient cycles involve movement of minerals and elements through the environment, which isn’t what distinguishes webs from chains—both actually involve energy transfer through feeding relationships. A web usually includes more species and interactions, not fewer. And webs, like chains, are not truly static—they change over time with seasons and other factors, so the idea that a web is static while a chain changes isn’t accurate.