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

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

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

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

   Ren's pond web has a box for bacteria in the mud. Bacteria break down wastes and remains and return nutrients to the water. What role is that box?

   • Producer: it makes its own food using the light
   • Decomposer: it returns nutrients to the water
   • Extra: the pond would work the same without it
   • Source: it gives the pond its very first energy
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 desert grass
   • From the lizards back to the grasshoppers
   • From the grasshoppers to the lizards
   • From the lizards to the sun
6. 6.

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

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

   • Bacteria in the mud
   • The sun
   • Frogs
   • Pond algae
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 gets energy from other organisms
   • It takes its food from the soil
   • It breaks down wastes and remains
   • It makes its own food using light
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 breaks down wastes and remains
   • It is an extra the soil can do without
   • It makes its own food using light
   • It gets energy from a plant
10. 10.

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

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