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4th Grade Study Guide Food Chain Student Questions and Answers: 1. What are three organisms considered to be producers? Possible answers: Pine tree, fruit trees, grasses, vegetable plants, rose bushes, etc. 2. Why are producers important in an ecosystem? Possible answer: Producers use energy from the sun to produce food and oxygen for all other organisms. 3. What are three different organisms considered to be consumers? Possible answers: Horses, dogs, cats, cows, humans, birds, fish, snakes, insects 4. What purpose(s) do consumers serve in an ecosystem? Answer: Consumers control populations of other organisms; they also return carbon dioxide and nutrients to the environment that the producers need to produce food. 5. What are three different organisms considered to be decomposers? Possible Answers: Bacteria, mushrooms (fungi), some insect larva, and insects. 6. What two things that would happen to an ecosystem if no decomposers were present? Answer: Very few nutrients would be returned to the environment. Dead organisms would not be broken down and would continue to pile up in the ecosystem.