17.2, Food Webs

The African savanna is a grassland with scattered shrubs and small trees. Some of the organisms that live in the savanna are shown below with arrows to show their interaction. Which two types of organisms have a producer-consumer relationship in the African savanna?

• zebras and hyenas
• hyenas and cheetahs
• trees and elephants
• fungi and dung beetles

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A student researching an ecosystem near their house recorded the following observations. Based on the student's observations, which food web best represents this ecosystem?

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Which list shows a possible order in which energy moves through an ecosystem?

• primary consumer, secondary consumer, Sun, producer, decomposer
• Sun, producer, primary consumer, decomposer
• Sun, primary consumer, secondary consumer, producer
• producer, Sun, secondary consumer, decomposer

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The food web below shows the interactions between several different species. If the grasshopper population were to decrease, what would most likely occur?

• The coyote population would decrease.
• The frog population would decrease.
• The amount of grass would decrease.
• The fish population would decrease.

Which of the following would be a secondary consumer?

• a bear that eats a snake which eats a mouse
• a mushroom that decomposes dead plant matter on the forest floor
• a black-tailed deer that eats grass and shrubs in the ecosystem
• a bobcat that eats a rabbit which eats grass and other plants

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The food web below shows the interaction between organisms in a river environment. Which of the following would increase the population of banded killifish?

• increase the population of small invertebrates
• increase the population of channel catfish
• decrease the population of white suckers
• decrease the population of microscopic algae and microorganisms

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A partial wetland food web is shown below. A drought caused much of this wetland to dry up. As a result, the number of cattails decreased. What effect would this most likely have on the rest of the ecosystem?

• The population of snakes would increase because they don’t need cattails to survive.
• The population of crickets would decrease because there would be less food for them to eat.
• The population of frogs would increase because there would be more crickets for them to eat.
• The population of hawks would decrease because they prefer to eat marsh grasses instead of cattails.

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