Food Chains and Ecosystems

Grade 3 Science Worksheet

Circle the answer.

1. 1.

   Which food chain is in the right order for a pond?

   • algae → fish → snail
   • algae → snail → fish
   • fish → snail → algae
   • snail → algae → fish
2. 2.

   In grass → grasshopper → frog → snake, which animal eats the grasshopper?

   • hawk
   • snake
   • frog
   • grass
3. 3.

   In phytoplankton → krill → penguin, what would happen to the penguins if the krill disappeared?

   • the penguins would start making food
   • the penguins would have less food
   • the penguins would have more food
   • the phytoplankton would disappear too
4. 4.

   What would happen in a forest with no decomposers?

   • there would be more sunlight
   • plants would grow faster
   • animals would need less food
   • dead plants and animals would pile up
5. 5.

   Where does the energy in a hawk's food first come from?

   • the rabbit
   • the sun
   • the soil
   • the hawk's nest
6. 6.

   Which pair shows a predator and its prey?

   • grass and rabbit
   • owl and mouse
   • mushroom and log
   • mouse and seeds
7. 7.

   A desert has cactus, mice, snakes and hawks. Which is the producer?

   • snake
   • hawk
   • cactus
   • mouse
8. 8.

   A meadow is mowed and the tall grass is gone. Which animal would most likely have a harder time surviving there?

   • bats that hunt at night
   • hawks that fly high above
   • earthworms deep in the soil
   • grasshoppers that eat the grass
9. 9.

   Why are producers important to every food chain?

   • they break down dead things
   • they eat the most animals
   • they are the largest living things
   • they bring energy from the sun into the chain
10. 10.

    In leaves → caterpillar → bird → fox, which is the producer?

    • leaves
    • bird
    • caterpillar
    • fox