What each part of a cell does
Grade 7 Science Worksheet
Circle the best answer.
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.
Ari learns that a sunflower leaf cell needs to build the proteins it uses. Which part does this job?
- Ribosomes
- Mitochondria
- Cell wall
- Chloroplasts
The drawing beside it is a boxy cell with the same letters on its parts. Esme filled in a job column for a sunflower leaf cell, but one row has a wrong job. Which row is wrong?
- The row for the nucleus
- The row for the mitochondria
- The row for the cell membrane
- The row for the ribosomes
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.
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?
- Both the same, because both are plant cells
- Cell 2, because roots need food too
- Cell 1, because it gets light to make sugar
- Neither, because the nucleus makes the sugar
Use this
No job column.
Kira studies a carrot root cell that takes in water from the soil. Which part controls what passes into the cell?
- Cytoplasm
- Large central vacuole
- Cell membrane
- Cell wall
Luz reads that a scientist removes the cell wall from a carrot root cell. What can the cell no longer do well?
- Keep its stiff shape and support
- Release energy from food
- Hold its DNA
- Control what goes in and out
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.
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?
- Cell 2, because it saves its energy for later
- Cell 1, because it needs more energy released from food
- Cell 1, because mitochondria make the energy it uses
- Both the same, because animal cells have equal mitochondria
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.
Pia studies a rabbit muscle cell that needs a steady supply of energy to move. Which part releases that energy from food?
- Cell membrane
- Mitochondria
- Chloroplasts
- Nucleus
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 release energy from food
- Cell Q, because ribosomes store the protein
- Cell P, because ribosomes make proteins
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.
Tala moves a lettuce plant into a dark closet for a day. What changes for the chloroplasts in a root cell?
- They stop making sugar, as in the leaf cells
- They release less energy from food
- They make proteins faster in the dark
- Nothing, because a root cell has no chloroplasts
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 wall
- The row for the central vacuole
- The row for the chloroplasts
- The row for the cell membrane