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?

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

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

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

   Luz reads a desert web: arrows run from desert shrub to beetles and from beetles to lizards. Which organism gets energy from the beetles?

   • The lizards
   • The desert shrub
   • The sun
   • No other organism
4. 4.

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

   • Consumer: it gets energy from other organisms
   • Decomposer: it breaks down remains in the soil
   • Producer: it makes its own food using light
   • Producer: it takes its food from the soil
5. 5.

   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?

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

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

   • 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
   • Consumer: it gets energy from another organism
7. 7.

   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 back to the grasshoppers
   • From the grasshoppers to the lizards
   • From the lizards to the sun
   • From the lizards to the desert grass
8. 8.

   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 sun
   • From the fungi to the soil
   • From the soil to the fungi
9. 9.

   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?

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