Energy flow in food webs

What you’ll practice

Energy flow is the backbone of ecosystem science, and this quiz helps you follow it across complex food webs rather than simple chains.

Each question has 4 options and there’s no timer, so you can think through trophic roles, energy loss, and real-world scenarios without rushing.

Difficulty and quiz setup

Difficulty is mixed to keep things balanced: you’ll see quick concept checks alongside more applied questions that combine multiple ideas.

Pick the question count you want before starting, and choose an easier or harder setting if you want to focus on fundamentals or push into trickier web-based reasoning.

Common pitfalls to avoid

Many mistakes come from mixing up energy flow with matter cycling, or assuming energy “recycles” the way nutrients do.

Watch for wording that swaps biomass, energy, and population size—these often change together, but they’re not the same thing.

• Confusing food chains (linear) with food webs (networked)
• Mislabeling trophic levels (producer vs. primary/secondary consumer)
• Forgetting energy is lost as heat at each transfer (10% rule as a guideline)
• Treating decomposers/detritivores as “top predators” instead of recyclers of matter
• Assuming more links in a web means more energy available at higher levels

Tips for scoring higher

When stuck, identify the organism’s role first (producer/consumer/decomposer), then infer where energy is coming from and where it can go next.

If two answers seem close, choose the one that best matches energy transfer direction and the expected drop in available energy up the trophic levels.