Photosynthesis: how plants make food from light, water and air

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Ari reads a leaf arrow diagram. Arrow X carries a gas from the air into the leaf. What does arrow X carry?

   • Oxygen
   • Water
   • Sugar
   • Carbon dioxide
2. 2.

   Bo reads a leaf arrow diagram. Arrow Y carries a gas out of the leaf into the air. What does arrow Y carry?

   • Light energy
   • Water
   • Carbon dioxide
   • Oxygen
3. 3.

   Esme reads a leaf arrow diagram. Arrow Z runs from the roots and stem into the leaf. What does arrow Z carry?

   • Water
   • Carbon dioxide
   • Sugar from the soil
   • Plant food from the soil
5. 4.

   Jun sorts the parts of photosynthesis. Is sugar an input or an output?

   • Input: sugar comes in mixed with the water
   • Input: the roots take sugar in from the soil to feed the leaf
   • Output: sugar leaves the leaf as a gas
   • Output: the leaf makes sugar and sends it through the plant
6. 5.

   Kira sorts the parts of photosynthesis. Is oxygen an input or an output?

   Use the picture in question 4.

   • Input: the leaf takes oxygen in to make sugar
   • Input: the roots take oxygen from the soil water
   • Output: the leaf gives off oxygen into the air
   • Output: oxygen leaves the plant through the roots
7. 6.

   Luz sorts the parts of photosynthesis. Is light energy an input or an output?

   Use the picture in question 4.

   • Output: the leaf glows with light it makes
   • Neither: a leaf makes sugar just as well in the dark
   • Input: light energy powers the change and is stored in the sugar
   • Input: light is a material that becomes part of the sugar it makes
8. 7.

   “not to scale” Noah pulls up a carrot from the school garden. Which part of the carrot plant makes most of its sugar?

   • The green leaves, because their cells have chloroplasts
   • The root, because it is in the soil
   • The root, because it is the biggest part of the whole plant
   • The root, because it is full of sugar
9. 8.

   Pia reads that carbon dioxide gets into a leaf through tiny openings, mostly on the leaf’s underside. What are these openings called?

   • Veins
   • Chloroplasts
   • Roots
   • Stomata
10. 9.

    Ren copies the word equation for photosynthesis. Which word belongs in the blank?

    • Soil
    • Oxygen
    • Carbon dioxide
    • Light
11. 10.

    Zee copies the word equation. What is written above the arrow, because it powers the change but is not a material?

    • Light energy
    • Oxygen
    • Soil
    • Heat from the ground