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?

   • Carbon dioxide
   • Oxygen
   • Water
   • Sugar
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?

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

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

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

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

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

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

   Cell wall, cell membrane, cytoplasm, nucleus, mitochondria, chloroplasts, large central vacuole. Milo reads about a leaf cell. In which part of the cell does photosynthesis take place?

   • Chloroplasts
   • Mitochondria
   • Nucleus
   • Cell wall
9. 8.

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

   • The root, because it is full of 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
10. 9.

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

    • Oxygen
    • Sugar
    • Carbon dioxide
    • Soil minerals
11. 10.

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

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