Science Practice Questions - Set 2

What can an increase in prey population lead to?

• Decrease in predator numbers

• Increase in predator numbers

• Extinction of prey

• No change in predator numbers

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What is the role of environmental scientists in studying predator-prey cycles?

• To increase predator numbers

• To demonstrate cycles in laboratory systems

• To eliminate prey species

• To create new predator species

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What is a food web?

• A linear sequence of organisms where each is eaten by the next.

• A complex network of feeding relationships in a community.

• A diagram showing energy flow in a single organism.

• A map of habitats in an ecosystem.

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What do primary producers rely on to create food?

• Other organisms

• Sunlight, carbon dioxide, and water

• Soil nutrients

• Animal waste

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Which animal is a tertiary consumer in the diagram?

• Pika

• Bobcat

• Pacific tree frog

• Red-breasted nuthatch

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What are primary consumers?

• Organisms that produce their own food

• Herbivores that feed directly on producers

• Organisms that feed on secondary consumers

• Decomposers that break down dead material

What is the role of a keystone species in an ecosystem?

• It produces energy for the ecosystem

• It has a significant impact on the food web

• It decomposes organic material

• It is the largest organism in the ecosystem

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What happens to energy as it moves up the trophic levels?

• It increases

• It remains the same

• It decreases

• It doubles

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Which of the following is an example of a predator keystone species?

• Sea otters preying on sea urchins.

• Beavers transforming streams into ponds.

• Mycorrhizal fungi in tree roots.

• Migrating birds depending on carcasses.

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What is the role of mutualists in an ecosystem?

• They control prey populations.

• They create habitats.

• They interact for each other’s benefit.

• They migrate seasonally.

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