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Interactive Grade 8 Science Ecosystems & Population Dynamics Worksheet

Science · Grade 8 · 15 questions

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Ecosystems & Population Dynamics

A farmer applies large amounts of fertiliser to crops near a river. What is the MOST LIKELY sequence of events that follows in the river ecosystem?

A.Fertiliser runoff increases algae growth → algae die and decompose → oxygen levels drop → fish die.B.Fertiliser runoff kills algae immediately → fish lose their food source → fish die.C.Fertiliser runoff increases fish population → fish eat all the algae → oxygen levels rise.D.Fertiliser runoff raises water temperature → fish migrate to cooler waters.

Which of the following correctly describes the difference between a PRODUCER and a CONSUMER?

A.Producers eat other organisms for energy, while consumers make their own food.B.Producers make their own food through photosynthesis, while consumers obtain energy by eating other organisms.C.Producers are always animals, while consumers are always plants.D.Producers only exist in aquatic ecosystems, while consumers are found on land.

Which of the following BEST describes a 'biotic' factor in an ecosystem?

A.The presence of predators in a habitatB.The amount of rainfall in a regionC.The pH level of the soilD.The temperature of a river

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