Plant cells and animal cells: how they are alike and different

Grade 7 Science Worksheet - Challenge Me

Circle the best answer.

1. Read this first

   Use this

   Side-by-side cell diagram, not to scale. Cell 1 (plant leaf cell) and Cell 2 (animal cell), with each part named. Cell 1: cell wall, cell membrane, cytoplasm, nucleus, mitochondria, chloroplasts, large central vacuole. Cell 2: cell membrane, cytoplasm, nucleus, mitochondria.

2. 1.

   Ari’s friend says plant cells do not need mitochondria because chloroplasts give them energy. Which response is best?

   • Agree: chloroplasts release the energy a plant cell uses
   • Agree: mitochondria belong in animal cells, not plant cells
   • Disagree: chloroplasts make sugar, and mitochondria release its energy
   • Disagree: plant cells have mitochondria and lack chloroplasts altogether
3. 2.

   Plant cell diagram, not to scale. C is the nucleus. Bo’s friend says a plant cell has a cell wall instead of a cell membrane. Which response is best?

   • Disagree: it has both, but the membrane sits outside the wall
   • Disagree: it has both, with the membrane just inside the wall
   • Agree: a membrane is needed in animal cells, not plant cells
   • Agree: the wall does the membrane’s job in plants
4. 3.

   Two cell drawings, not to scale, with each part named. Esme’s friend says every plant cell is green because every plant cell has chloroplasts. Which response is best?

   • Disagree: chloroplasts are found in flower cells, not in root cells
   • Agree: chloroplasts are what make a cell a plant cell
   • Disagree: root and bulb cells are plant cells with no chloroplasts
   • Agree: root cells have chloroplasts hidden by the soil
5. 4.

   “read about; the teacher prepared the slide” Jun puts two clues together. What is the best conclusion?

   • Plant cells from a part that gets no light, so no chloroplasts
   • Animal cells, because animal cells have thick walls too
   • Animal cells, because they have no chloroplasts
   • Plant cells, but they cannot release energy without chloroplasts
6. 5.

   Kira puts two clues together to sort a mystery cell. Which reasoning is complete?

   • Animal, because it has no cell wall, unlike plant cells
   • Animal, because it has mitochondria
   • Plant, because its membrane is a thin cell wall around it
   • Plant, because it has a nucleus and cytoplasm
7. 6.

   Note: no chloroplasts. Milo reads that root tip cells have no chloroplasts, yet they use energy to grow. Which explains this?

   • Root cells take energy straight from the soil
   • It cannot use energy until it grows chloroplasts to make sugar
   • Its mitochondria release energy from sugar sent from leaves
   • The root tip cell is really an animal cell
8. 7.

   Cheek cells, stained blue, with uneven, rounded edges and one dark dot in each. Not to scale. Noah reads that a cheek cell has no cell wall, yet it holds together. Which explains this?

   • It is not a true cell, because it has no wall like a plant cell
   • It has a thin cell wall too faint to see
   • Its nucleus holds the whole cell together
   • Its cell membrane surrounds it and holds the cytoplasm in

9. Cell theory card

   (1) All living things are made of one or more cells. (2) The cell is the basic living unit. (3) New cells come only from cells that already exist. Sketch: rows of small empty boxes, labeled “cork, seen by Hooke, 1665,” not to scale.

10. 8.

    In 1665 Robert Hooke saw tiny boxes he called cells in a thin slice of cork, which comes from tree bark. Which part of cell theory does Ren say it supports?

    • Part 3 is wrong: the bark made cells by itself
    • Part 1: a tree is a living thing made of cells
    • Part 1 is true for plants like trees, not animals
    • No part: the cork boxes are too small to be cells

11. Use this

    Cell theory card: (1) All living things are made of one or more cells. (2) The cell is the basic living unit. (3) New cells come only from cells that already exist.

12. 9.

    Scientists later watched one cell split into two under a microscope. Tala asks which part of cell theory this shows best. Which answer is best?

    • Part 1: living things are made of cells
    • No part: cells can also form from water
    • Part 3: new cells come from cells that already exist
    • No part: living things are made of nonliving parts

13. Cell theory card

    (1) All living things are made of one or more cells. (2) The cell is the basic living unit. (3) New cells come only from cells that already exist.

14. 10.

    Zee reads an old claim: “Mold grows from stale bread by itself, with no cells to start it.” Which response fits cell theory?

    • Agree: stale bread turns into mold over time
    • Disagree: mold grows from tiny mold cells that land on the bread
    • Disagree: the mold is made of the bread’s own cells
    • Agree: mold is not alive, so it needs no cells