How carbon moves through living things and the air

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   In the diagram, which process does arrow X stand for, Ari?

   • Dissolving in water
   • Respiration
   • Burning fuels
   • Photosynthesis
2. 2.

   Decomposers break down fallen leaves and give off carbon dioxide. In the diagram, which process is arrow X, Bo?

   • Burning
   • Dissolving
   • Photosynthesis
   • Decay
3. 3.

   Animals breathe out carbon dioxide. In the diagram, which process is arrow X, Esme?

   • Decay
   • Burning
   • Respiration
   • Photosynthesis
4. 4.

   Which way does the photosynthesis arrow move carbon, Jun?

   • From the air into the plants
   • From the soil into the air
   • From the plants into the air
   • From the plants into the soil
5. 5.

   Which way does the burning arrow move carbon, Kira?

   • From the air into the plants
   • From the air into the fossil fuels
   • From the fossil fuels into the air
   • From the plants into the fuels
6. 6.

   An apple tree grows a lot of new wood and fruit. Where did most of that carbon come from, Noah?

   • The water it takes in
   • Sunlight
   • Carbon dioxide in the air
   • The soil around its roots
7. 7.

   Coal, oil and gas hold carbon. Where did that carbon first come from, Pia?

   • Rain stored underground
   • Sunlight turned into rock
   • Soil deep underground
   • Ancient plants
8. 8.

   A carbon atom is in an acorn's sugar. A squirrel takes in the acorn as food. Where could that carbon go next, Ren?

   • Back into the air as carbon dioxide
   • It turns into energy and is gone
   • Nowhere: it is used up
   • Straight down into the soil to become rock
9. 9.

   A maple leaf falls in autumn and lands on the forest floor. Which box gets its carbon next, Tala?

   • Decomposers
   • The Sun
   • The carbon vanishes
   • Fossil fuels, right away
10. 10.

    A carrot plant grows a big orange root. Where did the root's carbon come from, Zee?

    • The soil around the root
    • Carbon dioxide taken in by the leaves
    • Water in the ground
    • Nowhere: plants make new carbon