Questions: Food Webs

Question 1

Why is a food web more accurate than a food chain in showing how energy moves through an ecosystem?

• A. Because food webs are easier to draw
• B. Because food webs show that most organisms eat and are eaten by multiple species, not just one
• C. Because food chains only include producers
• D. Because food webs do not include decomposers

Answer: (B)

A food chain shows just one linear path (e.g., grass → mouse → snake → hawk), but real ecosystems are far more complex. A mouse also eats seeds and berries, and it is also eaten by owls and foxes — not just snakes. A food web captures all of these connections, giving a much more realistic picture of how energy flows and how species depend on each other.

Question 2

If a food web has many interconnections, removing one species will typically collapse the entire ecosystem.

• T. True
• F. False

Answer: False

Highly interconnected food webs tend to be more resilient, not less. If one prey species declines, predators may have alternative food sources to switch to. Simple food webs with few connections are more fragile — if a key species disappears, the whole chain can break. That said, losing certain species (like top predators or primary producers) can cause significant disruptions even in complex webs.

Question 3

In a food web, what would likely happen if a disease wiped out the primary producers?

Model answer: All consumers would be affected because producers are the base of the food web. Herbivores would lose their food source and decline. Carnivores that eat herbivores would then decline as their prey disappears. Decomposers would temporarily increase (processing dead organisms) but would eventually decline too. The entire ecosystem would collapse without its energy base.

This illustrates that producers are the foundation of all food webs because they convert sunlight into the food that supports every other organism. Without them, no consumer has an energy source, and the ecosystem cannot sustain itself.