Subscribe

9th grade · Science · Unit 5 of 10

Photosynthesis & Respiration

How cells make and use energy

What your child practices

The reactants, products and location of photosynthesis and cellular respiration, why they are complementary, and how they link plants, animals and the carbon cycle.

Maine Learning Results learning standard: HS-LS1-5; HS-LS1-7 · photosynthesis and cellular respiration

How we explain it

Children can open this short lesson before they practice.

  1. Photosynthesis (in chloroplasts): carbon dioxide + water + light → glucose + oxygen.
  2. Cellular respiration (in mitochondria): glucose + oxygen → carbon dioxide + water + energy.
  3. The products of each are the reactants of the other, which cycles carbon.

Example: Which process releases oxygen: photosynthesis or respiration? Respiration uses oxygen. Photosynthesis gives it off. Answer: photosynthesis

Photosynthesis & Respiration in Maine

In the Maine Learning Results, this is unit 5 of 10 in 9th grade Science, after Electrons & Compounds and before The Periodic Table.

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: Maine Department of Education

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

    What are the products of cellular respiration?

    • oxygen and water only
    • glucose and light
    • glucose and oxygen
    • carbon dioxide, water and usable energy

  2. Question 2

    Photosynthesis or cellular respiration? Sort each statement.

    Sort into: ☀️ Photosynthesis · ⚡ Cellular respiration

    • 💨Releases oxygen
    • 🔥Breaks down glucose
    • 🌫️Takes in carbon dioxide
    • 🌿Happens in chloroplasts
    • 💭Releases carbon dioxide
    • 🌬️Uses oxygen

  3. Question 3

    Why are photosynthesis and cellular respiration called complementary?

    • They both make oxygen
    • They both happen only in animals
    • The products of each are the reactants of the other
    • They both need light

  4. Question 4

    Which gas released by photosynthesis do animals use in cellular respiration?

    • nitrogen
    • carbon dioxide
    • oxygen
    • hydrogen

  5. Question 5

    In C₆H₁₂O₆, how many hydrogen atoms are there altogether?

    answer box

  6. Question 6

    What are the products of photosynthesis?

    • carbon dioxide and glucose
    • water and oxygen only
    • glucose and oxygen
    • carbon dioxide and water

More 9th grade