Food webs: where energy and matter go in an ecosystem

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   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
   • No other organism
   • The desert shrub
2. 2.

   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
3. 3.

   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?

   • Extra: the pond would work the same without it
   • Source: it gives the pond its very first energy
   • Decomposer: it returns nutrients to the water
   • Producer: it makes its own food using the light
4. 4.

   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
   • Producer: the arrow points to it, so it is the food
   • Decomposer: it breaks down wastes and remains
   • Consumer: it gets energy from another organism
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 to the sun
   • From the lizards back to the grasshoppers
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 fungi to the sun
   • From the soil to the fungi
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?

   • The sun
   • Frogs
   • Pond algae
   • 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 gets energy from other organisms
   • It breaks down wastes and remains
   • 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 breaks down wastes and remains
   • It is an extra the soil can do without
   • 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 web
    • A food list
    • An energy loop
    • A food chain