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Grade 7 · Science · Unit 2 of 12

Food Chains & Energy

Who eats whom, and the energy

What your child practises

Producers, consumers and decomposers, food chains and webs, how energy shrinks as it passes up a chain (about 10% each step), and what happens when part of a chain changes.

Ontario Curriculum expectation: B2.3, B2.4 · producers, consumers and decomposers; energy transfer in food chains

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    What do producers do?

    • Eat other organisms
    • Break down dead matter
    • Hunt for food
    • Make their own food using energy from the Sun
    Show answer

    Make their own food using energy from the Sun

    Hint: Plants and algae use sunlight to make food by photosynthesis.

  2. Question 2

    Sea otters eat sea urchins, and urchins eat kelp. What can happen if the otters are removed from a coast?

    • The otters become producers
    • Urchins disappear
    • Urchins increase and the kelp forest can shrink
    • Kelp grows faster and covers the coast
    Show answer

    Urchins increase and the kelp forest can shrink

    Hint: Without a predator, urchin numbers rise and they eat more kelp.

  3. Question 3

    Put this food chain in order, from the organism that makes food to the last to eat.

    • 🐍snake
    • 🐸frog
    • 🦅hawk
    • 🦗grasshopper
    Show answer

    grasshopper → frog → snake → hawk

    Hint: Energy flows from the producer (grass) to the grasshopper, frog, snake and then hawk.

  4. Question 4

    A grasshopper eats grass. A frog eats the grasshopper. The frog is a…

    • secondary consumer
    • primary consumer
    • producer
    • decomposer
    Show answer

    secondary consumer

    Hint: A primary consumer eats producers. A secondary consumer eats primary consumers.

  5. Question 5

    Fewer wolves live in an area. What might happen to the deer, and then to the plants they eat?

    • Deer may increase, and the plants may be eaten more
    • Nothing changes in either group
    • Deer decrease, and the plants grow more
    • The plants stop needing sunlight
    Show answer

    Deer may increase, and the plants may be eaten more

    Hint: With fewer predators, prey numbers can rise and eat more of their food.

  6. Question 6

    A black bear eats berries, fish and insects. It is an…

    • decomposer
    • herbivore
    • omnivore
    • carnivore
    Show answer

    omnivore

    Hint: Omnivores eat both plants and animals.

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