What each part of a cell does

Grade 7 Science Worksheet

Circle the best answer.

1. Read this first

   Sunflower leaf cell drawing, not to scale

   a boxy cell with letters A to D. A sits on a thick outer layer around the whole cell. B sits on tiny dots in the jelly. C sits on a green oval part with stacks inside. D sits on a small bean-shaped part with a folded inside. No job column.

2. 1.

   Ari learns that a sunflower leaf cell needs to build the proteins it uses. Which part does this job?

   • Mitochondria
   • Cell wall
   • Ribosomes
   • Chloroplasts

3. Sunflower leaf cell drawing, not to scale

   a boxy cell with letters A to D. A sits on a thick outer layer around the whole cell. B sits on a green oval part with stacks inside. C sits on a large round body near the middle. D sits on a small bean-shaped part with a folded inside. No job column.

4. 2.

   Bo reads that a sunflower leaf cell in bright light has chloroplasts that stop working. What can the cell no longer do?

   • Hold its DNA
   • Make sugar using light energy
   • Build proteins
   • Release energy from food

5. Two cell drawings, not to scale

   Cell 1 from near the top of a leaf and Cell 2 from deep in a root. Each is a boxy cell with letter A on a thick outer layer around the whole cell and letter B on a large round body near the middle.

6. 3.

   Jun compares two cells from one carrot plant: one near the top of a leaf in bright light, one deep in the root. Which has more chloroplasts?

   • Cell 1, because it gets light to make sugar
   • Both the same, because both are plant cells
   • Cell 2, because roots need food too
   • Neither, because the nucleus makes the sugar
7. 4.

   No job column. Luz reads that a scientist removes the cell wall from a carrot root cell. What can the cell no longer do well?

   • Control what goes in and out
   • Release energy from food
   • Keep its stiff shape and support
   • Hold its DNA

8. Use this

   not to scale: Cell 1 is a muscle cell in a rabbit's leg and Cell 2 is a rabbit cell that uses little energy.

9. 5.

   Milo reads about two cells in a rabbit's body. Cell 1 is a leg muscle cell that uses a lot of energy; Cell 2 uses little. Which has more mitochondria?

   • Both the same, because animal cells have equal mitochondria
   • Cell 1, because mitochondria make the energy it uses
   • Cell 1, because it needs more energy released from food
   • Cell 2, because it saves its energy for later
10. 6.

    The drawing beside it is a rounded cell with the same letters on its parts. Noah filled in a job column for a rabbit muscle cell, but one row has a wrong job. Which row is wrong?

    • The row for the ribosomes
    • The row for the nucleus
    • The row for the mitochondria
    • The row for the cell membrane

11. Rabbit muscle cell drawing, not to scale

    a rounded cell with letters A to D. A sits on a small bean-shaped part with a folded inside. B sits on a large round body near the middle. C sits on the thin boundary line around the cell. D sits on tiny dots in the jelly. No job column.

12. 7.

    Pia studies a rabbit muscle cell that needs a steady supply of energy to move. Which part releases that energy from food?

    • Mitochondria
    • Cell membrane
    • Chloroplasts
    • Nucleus
13. 8.

    not to scale; both from a lettuce leaf. Ren compares two lettuce leaf cells. Cell P builds a lot of protein for growth; Cell Q builds very little. Which has more ribosomes?

    • Both the same, because cells share the same ribosomes
    • Cell P, because ribosomes make proteins
    • Cell Q, because ribosomes store the protein
    • Cell P, because ribosomes release energy from food

14. Use this

    Lettuce root cell drawing, not to scale: a boxy cell with letters A to D. A sits on a thick outer layer around the whole cell. B sits on a large round body near the middle. C sits on a small bean-shaped part with a folded inside. D sits on a large open space in the middle. No job column.

15. 9.

    Tala moves a lettuce plant into a dark closet for a day. What changes for the chloroplasts in a root cell?

    • Nothing, because a root cell has no chloroplasts
    • They stop making sugar, as in the leaf cells
    • They release less energy from food
    • They make proteins faster in the dark
16. 10.

    The drawing beside it is a boxy cell with the same letters on its parts. Zee filled in a job column for a lettuce leaf cell, but one row has a wrong job. Which row is wrong?

    • The row for the cell membrane
    • The row for the central vacuole
    • The row for the cell wall
    • The row for the chloroplasts