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
   • Disagree: chloroplasts make sugar, and mitochondria release its energy
   • Disagree: plant cells have mitochondria and lack chloroplasts altogether
   • Agree: mitochondria belong in animal cells, not plant cells
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, with the membrane just inside the wall
   • Agree: the wall does the membrane’s job in plants
   • Agree: a membrane is needed in animal cells, not plant cells
   • Disagree: it has both, but the membrane sits outside the wall
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
   • Disagree: root and bulb cells are plant cells with no chloroplasts
   • Agree: root cells have chloroplasts hidden by the soil
   • Agree: chloroplasts are what make a cell a plant cell
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
   • Plant cells, but they cannot release energy without chloroplasts
   • Animal cells, because they have no chloroplasts
6. 5.

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

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

7. Use this

   Two cell outlines, not to scale, the same size, labeled Cell 1 (from a tomato leaf) and Cell 2 (from a cat’s skin). No parts are drawn.

8. 6.

   Luz puts two clues together. One cell came from a tomato leaf and one from a cat’s skin. Which part would Luz expect in the leaf cell but not the skin cell?

   • Mitochondria, because the skin cell uses no energy
   • A nucleus, because a skin cell has no nucleus
   • Chloroplasts, because the leaf cell makes food from light
   • A cell membrane, because the skin cell has a wall instead
9. 7.

   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
   • The root tip cell is really an animal cell
   • Its mitochondria release energy from sugar sent from leaves
   • It cannot use energy until it grows chloroplasts to make sugar
10. 8.

    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?

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

11. 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.

12. 9.

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

13. 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.

14. 10.

    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?

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