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Ecosystem Dynamics Classwork & Homework
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Classwork #1: Food Webs
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1 Why is a food web useful? What does it show?
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2 If animals cannot make their own food or create their own energy, where does their energy come from?
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3 What do you hypothesize would happen if the Sun was to stop shining in this area? What impact would it have on a food web?
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4 Describe the difference between a primary consumer and a secondary consumer.
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5 Correctly set up the following food web:
- a. Bears are secondary consumers of
rabbits, deer and foxes
- b. Deer eat berries and leaves
- c. Rabbits eat berries and leaves
- d. Foxes eat rabbits
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Homework: Food Webs
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6 What kind of food would an herbivore eat? Give an example.
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7 What kind of food would a carnivore eat? Give an example.
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8 What kind of food would an omnivore eat? Give an example.
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9 What level of consumers are humans?
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10 Create a food web of your local area. Include at least 2 producers, 2 primary consumers and 2 secondary consumers.
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Classwork: Decomposers
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11 Define decomposition.
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12 What are two organisms that help with decomposition?
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13 What effect does the growth of mushrooms have
- n the surrounding environment?
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14 Why is composting a positive thing to do in your garden?
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15 List three factors that impact the rate of decomposition.
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Homework: Decomposers
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16 What types of organisms are examples of fungi?
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17 Why is decomposition important for an ecosystem?
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18 How can you speed up the process of decomposition?
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19 Bill is testing the effects of decomposition on two identical pieces of bread. One piece of bread is placed in an empty plastic bag. One is placed in a bag with water. One is placed in a bag with water and placed under a heat lamp. Which do you expect to rot the most? Why?
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Classwork: Cycles of Matter
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20 How do we define matter? Give two examples.
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21 What are all living things primarily made up of?
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22 How does the matter that makes up plants make its way to a secondary consumer?
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23 What is responsible for recycling dead matter?
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24 What role does the environment play in the cycle
- f matter? Give two examples.
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Homework: Cycles of Matter
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25 What is soil composed of?
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26 How does the Law of the Conservation of Mass apply to a food web?
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27 What are the three main elements that make up the human body? Which substance makes up between 60%-75% of the human body?
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28 What would happen if matter was not returned to the soil?
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29 Create a model that displays the movement of matter between plants, animals, decomposers and the environment.
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Classwork: Maintaining an Ecosystem
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30 What are the four basic needs of organisms?
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31 Why are plants so important to an ecosystem?
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32 What negative effects does overpopulation have
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33 Why is the introduction of the cane toad in Australia having negative effects on the ecosystem? What efforts are being made to stop their spread?
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Homework: Maintaining an Ecosystem
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34 Why are ecosystems considered fragile?
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35 How do organisms make sure that they maintain a proper population balance?
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36 What negative effects does over-hunting have on an ecosystem?
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37 What is the difference between a native species and an alien species?
