Ecosystems — Grade 4 Science 练习题

Grade 4 简单难度 10 道题

An ecosystem is a community of living organisms interacting with each other and their nonliving environment — sunlight, water, soil, and air.

Producers (plants and algae) make their own food through photosynthesis. Consumers eat other organisms. Decomposers break down dead matter and return nutrients to the soil.

Food chains show energy flow from one organism to the next. Food webs show overlapping chains in a community. Energy decreases at each level — only about 10% transfers to the next trophic level.

练习的技能

  • Identifying producers, consumers, and decomposers
  • Building and reading food chains
  • Understanding energy flow
  • Describing habitat roles
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练习题：Ecosystems

说明： 仔细解答每一道题。清晰地展示所有解题过程。在指定位置或按指示在另一张纸上写出最终答案。

  1. 1.What is an ecosystem?

Ecosystems — 练习题（续）

  1. 2.Which of the following is a living part of an ecosystem?
    1. A. Sunlight
    2. B. Water
    3. C. Tree
    4. D. Soil

Ecosystems — 练习题（续）

  1. 3.Name two nonliving things in an ecosystem.
  2. 4.A is an animal that eats only plants.

Ecosystems — 练习题（续）

  1. 5.Draw a simple food chain with three parts. Label each part.

Ecosystems — 练习题（续）

  1. 6.Which of the following is a producer in an ecosystem?
    1. A. Fox
    2. B. Grass
    3. C. Mushroom
    4. D. Hawk

Ecosystems — 练习题（续）

  1. 7.What happens to the plants and animals in an ecosystem when there is not enough water?
  2. 8.A is a living thing that breaks down dead plants and animals.

Ecosystems — 练习题（续）

  1. 9.Circle the correct answer: A deer is a (herbivore / carnivore / omnivore).
  2. 10.Why are decomposers important in an ecosystem?

参考答案

  1. 1.
    最终答案： An ecosystem is a community of living things interacting with each other and with their nonliving environment.
  2. 2.
    最终答案： c) Tree
  3. 3.
    最终答案： Accept any two: sunlight, water, soil, air, rocks, temperature.
  4. 4.
    最终答案： herbivore
  5. 5.
    最终答案： Example: Sun →\rightarrow Grass →\rightarrow Rabbit. (Accept any correct three-part chain with labels.)
  6. 6.
    最终答案： b) Grass

参考答案（续）

  1. 7.
    最终答案： Plants may wilt or die, and animals may move away or die from lack of water.
  2. 8.
    最终答案： decomposer
  3. 9.
    最终答案： herbivore
  4. 10.
    最终答案： Decomposers break down dead plants and animals, returning nutrients to the soil so new plants can grow.
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需要避免的常见错误

  • Calling all animals producers
  • Reversing arrow direction in food chains (arrows point to who gets eaten)
  • Forgetting decomposers in food webs
  • Confusing habitat with ecosystem

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