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7th grade · Science · Unit 2 of 16

Cells & Life Processes

Organelles, photosynthesis and respiration

What your child practices

The cell theory, what organelles do in plant and animal cells, how photosynthesis and respiration are connected, osmosis, and how cells form tissues, organs and organ systems.

Alabama Course of Study content standard: 7.1; 7.2 · organelles such as chloroplasts and mitochondria, photosynthesis and cellular respiration

How we explain it

Children can open this short lesson before they practice.

  1. Cell theory: all living things are made of cells, and cells come from other cells.
  2. Chloroplasts do photosynthesis; mitochondria do respiration. The products of one are the inputs of the other.
  3. Osmosis is water moving across a membrane. Cells form tissues, organs and systems.

Example: What are the products of photosynthesis? Plants use light, water and carbon dioxide. They make sugar and give off a gas. Answer: glucose and oxygen

Cells & Life Processes in Alabama

In the Alabama Course of Study, this is unit 2 of 16 in 7th grade Science, after Cells: Life's Building Blocks and before Cells, Tissues & Organs.

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 is the correct order from smallest to largest?

    • organ system → organ → tissue → cell
    • tissue → cell → organ system → organ
    • organ → cell → tissue → organ system
    • cell → tissue → organ → organ system

  2. Question 2

    What is the basic unit of life?

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

  3. Question 3

    What are the inputs of photosynthesis?

    • sugar and light
    • carbon dioxide, water and light energy
    • oxygen and water
    • oxygen and sugar

  4. Question 4

    What are the products of photosynthesis?

    • carbon dioxide and water
    • glucose (sugar) and oxygen
    • water and energy
    • carbon dioxide and oxygen

  5. Question 5

    How are photosynthesis and cellular respiration related?

    • They are the same process.
    • They happen only at night.
    • The products of one are the inputs of the other.
    • They happen only in animals.

  6. Question 6

    Where does photosynthesis happen in a plant cell?

    • mitochondria
    • nucleus
    • ribosomes
    • chloroplasts

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