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Food Web Energy Flow

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Food Web Energy Flow

Explore energy flow in a New Zealand ngahere (forest) food web. Follow the arrows carefully: each arrow points from the food or energy source to the organism that receives the energy. Use evidence from the food web information below to answer the questions.

Decode the food web

Food web information: Sunlight → fern, grasses, and tree. Fern, grasses, and tree → wētā. Wētā → bird. Earthworms → bird. Dead plants and animals → fungi and earthworms. Remember: a producer makes its own food using energy from sunlight. Consumers get energy by eating other organisms. Decomposers break down dead material and return nutrients to the environment. Plants absorb nutrients from the soil through their roots.

1.Which organisms in the food web are producers, and how do they obtain energy?
2.Choose the best description of an arrow pointing from the wētā to the bird.
  • The bird provides energy to the wētā.
  • The wētā provides energy to the bird when the bird eats it.
  • The wētā makes sunlight for the bird.
  • The arrow shows where the bird lives.
3.Match each organism with its role in this food web.
  • Fern
  • Wētā
  • Bird
  • Fungi
  • Consumer that can eat other consumers
  • Producer
  • Primary consumer
  • Decomposer
4.True or false: The sun is the original energy source for this food web, but it is not an organism in the food web.
TrueFalse
5.Using the food web information above, name one path showing energy moving from the sun to a bird.
6.The fern captures 8,000 kJ of energy. If about 10% passes to the wētā, how much energy is available to the wētā? Show your calculation.
7.About 10% of the wētā's 800 kJ may pass to a bird. Calculate the energy available to the bird.
8.A student says, “Energy cycles around the food web in the same way nutrients do.” Explain what is incorrect about this statement.
9.Suppose the number of wētā in this forest falls sharply. Predict one possible effect on the birds and one possible effect on the plants. Explain each prediction using the food web information above.
10.Fungi and earthworms help break down dead material. What happens to nutrients in that material, and how can plants use them again?

2 printable pages

  • Food Web Energy Flow, page 1 of 2: Decode the food web

    Page 1

  • Food Web Energy Flow, page 2 of 2: 5. Using the food web information above, name one path showing energy moving from the sun…

    Page 2

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