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
   • The tadpoles live inside the pond algae
   • Energy moves in a circle between the two organisms
   • 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?

   • From the fungi to the fallen leaves
   • Around and around, back to the leaves
   • Nowhere; arrows show which box is bigger
   • From the fallen leaves to the fungi
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 sun
   • The lizards
   • The desert shrub
   • No other organism
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?

   • 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
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 grasshoppers to the lizards
   • From the lizards to the desert grass
   • From the lizards back to the grasshoppers
   • 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 fungi to the soil
   • No arrow is needed; the leaves just vanish
   • 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
   • Frogs
   • The sun
   • 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 makes its own food using light
   • It breaks down wastes and remains
   • It gets energy from other organisms
   • It takes its food from the soil
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 makes its own food using light
   • It gets energy from a plant
   • It breaks down wastes and remains
   • It is an extra the soil can do without
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
    • An energy loop
    • A food web