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7th grade · Science · Unit 3 of 16

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.

Alabama Course of Study content standard: 7.1; 7.4 · cells, tissues and organs, and how materials move into and out of cells

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 Alabama

In the Alabama Course of Study, this is unit 3 of 16 in 7th grade Science, after Cells & Life Processes and before Photosynthesis & Respiration.

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: Alabama State Department of Education (ALSDE)

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

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

    • chloroplast
    • nucleus
    • cell wall
    • vacuole

  2. Question 2

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

    • 🔬Cell
    • 🧵Tissue
    • 🫀Organ
    • 🫁Organ system

  3. Question 3

    Which of these shows how living things are organized, from small to large?

    • organ, cell, tissue, organism, organ system
    • tissue, cell, organism, organ, organ system
    • cell, tissue, organ, organ system, organism
    • organism, organ system, cell, tissue, organ

  4. Question 4

    Osmosis is the movement of which material through a cell membrane?

    • sugar
    • salt
    • water
    • oxygen only

  5. Question 5

    How is a plant cell different from an animal cell?

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

  6. Question 6

    What is the basic unit of life?

    • the tissue
    • the organ
    • the atom
    • the cell

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