The toughest sheet asks third graders to think like ecologists. Part A's multiple-choice items predict what happens when frogs vanish from a pond food web, identify a rabbit as both consumer and prey in a grassland, explain why food webs beat single chains, and figure out how forest animals respond when trees are cut for houses. Part B fills in blanks about lost habitats, river pollution harming aquatic ecosystems, keystone species, nocturnal animals, and invasive species pushing out natives.
Working through these scenarios builds the cause-and-effect reasoning fourth-grade ecology will demand.
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Habitats and Ecosystems
Part A: Multiple Choice
Circle the best answer for each question.
1. In a pond food web, what would happen if all the frogs disappeared?
A) Insect populations would increase.
B) Algae would stop growing.
C) Fish would have more insects to eat.
D) Nothing would change.
2. Which organism is both a consumer and prey in a grassland food chain?
A) grass
B) hawk
C) rabbit
D) mushroom
3. Why do food webs give a better picture of an ecosystem than a single food chain?
A) Food webs only show producers.
B) Food webs include nonliving things.
C) Food webs show that most animals eat more than one food source.
D) Food webs are shorter and simpler.
4. A forest is cut down to build houses. What is the most likely result for the animals?
A) Animals will find more food than before.
B) Animals must move, adapt, or they may not survive.
C) Animals will grow thicker fur.
D) Animals will start eating rocks.
Part B: Fill in the Blank
Write the correct answer on each line.
1. When people cut down trees, animals lose their habitat and food sources.
2. Pollution in a river can harm the entire aquatic ecosystem.
3. A species that many other organisms depend on is called a keystone species.
4. Animals that are active at night are called nocturnal animals.
5. An invasive species can take over a habitat and push out native animals.
Habitats and Ecosystems
★ Part A: Multiple Choice
Circle the best answer for each question.
1. In a pond food web, what would happen if all the frogs disappeared?
A) Insect populations would increase.
B) Algae would stop growing.
C) Fish would have more insects to eat.
D) Nothing would change.
2. Which organism is both a consumer and prey in a grassland food chain?
A) grass
B) hawk
C) rabbit
D) mushroom
3. Why do food webs give a better picture of an ecosystem than a single food chain?
A) Food webs only show producers.
B) Food webs include nonliving things.
C) Food webs show that most animals eat more than one food source.
D) Food webs are shorter and simpler.
4. A forest is cut down to build houses. What is the most likely result for the animals?
A) Animals will find more food than before.
B) Animals must move, adapt, or they may not survive.
C) Animals will grow thicker fur.
D) Animals will start eating rocks.
★ Part B: Fill in the Blank
Write the correct answer on each line.
1) When people cut down trees, animals lose their habitat and food sources.
2) Pollution in a river can harm the entire aquatic ecosystem.
3) A species that many other organisms depend on is called a keystone species.
4) Animals that are active at night are called nocturnal animals.
5) An invasive species can take over a habitat and push out native animals.
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9 Questions
12-18 minutes
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