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7th grade · Science · Unit 12 of 18

Cells, Tissues & Organs

Single cells, specialized cells, diffusion and osmosis

What your child practices

Why cells are the basic unit of life, how plant and animal cells differ, how materials move into and out of cells, and how cells form tissues, organs and systems. Includes working out microscope magnification.

Texas Essential Knowledge and Skills (TEKS) teks student expectation: 7.13(B) · cells, tissues, organs and organ systems

How we explain it

Children can open this short lesson before they practice.

  1. All living things are made of cells. Plant cells also have a cell wall and chloroplasts.
  2. Materials move into and out of cells through the cell membrane, from more crowded to less crowded areas.
  3. Cells form tissues, tissues form organs, organs form systems. Magnification = eyepiece × objective.

Example: A microscope has a 10× eyepiece and a 40× objective. What is the magnification? Multiply the two lenses. 10 × 40 = 400. Answer: 400×

Cells, Tissues & Organs in Texas

In the Texas Essential Knowledge and Skills (TEKS), this is unit 12 of 18 in 7th grade Science, after Heart, Bones & Muscles and before Sorting Living Things.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Texas Education Agency (TEA)

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    How is a plant cell different from an animal cell?

    • A plant cell has a cell wall and chloroplasts.
    • An animal cell has a cell wall.
    • A plant cell has no membrane.
    • A plant cell has no nucleus.

  2. Question 2

    Which of these is a single-celled organism?

    • a poplar tree
    • an amoeba
    • a grizzly bear
    • a goldfish

  3. Question 3

    A microscope has a 10× eyepiece and a 10× objective lens. What is the total magnification?

    answer box×

  4. Question 4

    Diffusion is the movement of particles from…

    • an area of lower concentration to higher concentration
    • a hot area to a cold area only
    • an area of higher concentration to an area of lower concentration
    • the nucleus to the membrane only

  5. Question 5

    Put these levels of organization in order from smallest to largest.

    • 🫁Organ system
    • 🫀Organ
    • 🧍Organism
    • 🔬Cell

  6. Question 6

    Which part of a plant cell captures light energy for making food?

    • vacuole
    • cell wall
    • chloroplast
    • nucleus

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