CHECKPOINT 1 REVIEW 24-25

Fox squirrels are common in Texas. Fox squirrels primarily eat acorns and nuts from trees but also eat insects. Some predators of fox squirrels include owls, snakes, and bobcats.

Which diagram best represents how energy would flow to and from the fox squirrel?

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The diagram below shows an energy pyramid. In a marine ecosystem, algae carry out photosynthesis. Barracuda eat snapper fish. Reef sharks eat barracuda.

Which organism would be at the top of the energy pyramid?

• algae

• reef shark

• barracuda

• snapper fish

The figure below shows a food chain that might exist in a meadow.

Which of the following best describes what the food chain represents?

• how an organism might change over time

• the movement of organisms throughout the ecosystem

• the increase in size among organisms in the ecosystem

• the path of energy transfer from producers to consumers

The food web below shows some of the feeding relationships among organisms in Arctic waters.

Which organism would be least affected by overfishing for cod in Arctic waters?

• seals

• shrimp

• baleen whales

• toothed whales

This global food web shows how parts of a meadow ecosystem interact with parts of a marsh ecosystem.

Which of these is a food chain that is part of the global food web?

• meadow grass → rabbit → fox → hawk

• marsh grass → snail → small fish → hawk

• marsh grass → grasshopper → mouse → fox

• meadow grass → grasshopper → praying mantis → small fish

A student researching a northern forest ecosystem learns the following information about feeding relationships in the ecosystem.

Which food web best represents the flow of energy in these feeding relationships?

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Organisms that break down wastes and dead organisms and return the raw materials to the environment

• Producer

• Consumer

• Decomposer

In the food web above, what organism is missing from this food chain:

Grass --> Slug --> ________ --> Hawk

• Vole

• Frog

• Insect

• Thrush

How much energy is available to be passed on to the next level in a food web?

• 100%

• 10%

• 50%

• 75%

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

• There would be a decrease in the small bird population.

• There would be a decrease in the grass/flowers population.

• There would be a decrease in the mice population.

• There would be an increase in the grass/flowers population.