Food webs: where energy and matter go in an ecosystem

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Ari reads a pond web with one arrow, from pond algae to tadpoles. What does the arrow show?

   • The pond algae get energy from the tadpoles
   • Energy moves in a circle between the two organisms
   • The tadpoles live inside the pond algae
   • The tadpoles get energy from the pond algae
2. 2.

   Bo sees an arrow from fallen leaves to fungi on a forest floor. Which way does the energy move?

   • Around and around, back to the leaves
   • From the fallen leaves to the fungi
   • Nowhere; arrows show which box is bigger
   • From the fungi to the fallen leaves
3. 3.

   In Esme's school garden web, an arrow runs from the sun to the bean plants. What role do the bean plants have?

   • Producer: it makes its own food using light
   • Consumer: it gets energy from other organisms
   • Decomposer: it breaks down remains in the soil
   • Producer: it takes its food from the soil
4. 4.

   In Tala's forest web, an arrow runs from oak seeds to mice. What role do the mice have?

   • Consumer: it gets energy from another organism
   • Producer: it makes its own food from light
   • Decomposer: it breaks down wastes and remains
   • Producer: the arrow points to it, so it is the food
5. 5.

   Jun's desert web has boxes for desert grass, grasshoppers and lizards, and one arrow from the grass to the grasshoppers. Which arrow is missing so energy reaches the lizards?

   • From the lizards to the sun
   • From the lizards back to the grasshoppers
   • From the lizards to the desert grass
   • From the grasshoppers to the lizards
6. 6.

   Zee studies a garden bed where fungi break down fallen leaves. Which missing arrow, labeled nutrients, shows matter returning to the soil?

   • No arrow is needed; the leaves just vanish
   • From the fungi to the soil
   • From the soil to the fungi
   • From the fungi to the sun
7. 7.

   Pia's pond web has an arrow from box B to the tadpoles. Box B is blank. Which word bank choice belongs in box B?

   • Pond algae
   • The sun
   • Frogs
   • Bacteria in the mud
8. 8.

   Forest floor web, not to scale. Boxes: moss (producer tag). Kira reads that moss on a forest floor is a producer. Which meaning matches the word producer?

   • It breaks down wastes and remains
   • It takes its food from the soil
   • It makes its own food using light
   • It gets energy from other organisms
9. 9.

   Desert soil web, not to scale. Boxes: fungi (decomposer tag). Milo reads that fungi in desert soil break down wastes and remains. Which meaning matches the word decomposer?

   • It is an extra the soil can do without
   • It breaks down wastes and remains
   • It gets energy from a plant
   • It makes its own food using light
10. 10.

    Noah draws arrows to join several food chains from a school garden. What is this joined drawing called?

    • A food chain
    • An energy loop
    • A food list
    • A food web