Back to the lesson plan builder
Lesson length30 min45 min60 min
Questions🔀 New questions

Print the plan for yourself; the student sheet prints on its own page after it.

Science lesson plan · 11th grade (Year 12 in England) · 60 minutes

Light-dependent reactions and the Calvin cycle

Plants

CCSS NGSS.HS-LS1-5England: A level Biology: Photosynthesis (extension)

Objective and success criteria

Students will: Light-dependent reactions and the Calvin cycle.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: Photosynthesis: word and balanced symbol equations

Leads to: the next skill in this area.

Materials: Real plants or seeds, Hand lenses, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).

Warm-up · 6 min

  • Quick retrieval from earlier learning (Photosynthesis: word and balanced symbol equations). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. Which is the balanced symbol equation for photosynthesis? (6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ / 6O₂ + 6H₂O → C₆H₁₂O₆ + 6CO₂ / CO₂ + H₂O → C₆H₁₂O₆ + O₂ / C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O) → 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂Prompt: Carbon dioxide and water are the reactants.
  2. A leaf makes 4 molecules of glucose by photosynthesis. Using 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂, how many oxygen molecules are released? → 24Prompt: Read the numbers in front of each formula.
  3. Which substance in chloroplasts absorbs the light? (chlorophyll / starch / cellulose / glucose) → chlorophyllPrompt: It is a green pigment.

Hook · 6 min

  • Bring in a plant that has been kept in the dark next to one in the light, and ask what happened.
  • Share the objective: Light-dependent reactions and the Calvin cycle. Read the success criteria together.

I do: model it · 12 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: Which stage of photosynthesis: fixes carbon dioxide with the enzyme RuBisCO?
  • Step 1: The Calvin cycle in the stroma fixes carbon dioxide using ATP and NADPH to make sugars.
  • Step 2: So the answer is: Calvin cycle (light-independent)
  • Answer: Calvin cycle (light-independent)
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 12 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. Which stage of photosynthesis: fixes carbon dioxide with the enzyme RuBisCO? (light-dependent reactions / Calvin cycle (light-independent)) → Calvin cycle (light-independent)Prompt: Which stage needs carbon dioxide and which needs light energy directly?
  2. Where in the chloroplast is chlorophyll found? (in starch grains / in the stroma / in the thylakoid membranes / in the outer membrane only) → in the thylakoid membranesPrompt: Chlorophyll absorbs light for the first stage.

You do: independent practice · 17 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

Exit ticket · 7 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. Which stage of photosynthesis: fixes carbon dioxide with the enzyme RuBisCO? (light-dependent reactions / Calvin cycle (light-independent)) → Calvin cycle (light-independent)Prompt: Which stage needs carbon dioxide and which needs light energy directly?
  2. Scientists gave algae water containing a heavy oxygen isotope (¹⁸O). Where did the ¹⁸O end up? (in the carbon dioxide absorbed / in the chlorophyll / in the glucose made / in the oxygen gas released) → in the oxygen gas releasedPrompt: Which reactant is split in the light-dependent reactions?

Watch out for

  • Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
  • Remembering facts without the reason: ask "why?" and "what is the evidence?"

Support and stretch

Support

  • Review first: Photosynthesis: word and balanced symbol equations.
  • Use concrete materials: real plants or seeds.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-11.

Free lesson plan from eurekami.com/lesson-plan-builder

eurekami

Light-dependent reactions and the Calvin cycle

Name

Date

Score/ 8

  1. Question 1

    Stages of photosynthesis: which statement is NOT true?

    • A. Chlorophyll is found in the thylakoid membranes.
    • B. The Calvin cycle only happens at night.
    • C. The Calvin cycle uses ATP and NADPH.
    • D. The Calvin cycle takes place in the stroma.

  2. Question 2

    A plant is moved into darkness. Why does the Calvin cycle soon stop, even though it does not use light directly?

    • A. The stroma freezes
    • B. Carbon dioxide disappears in the dark
    • C. It runs out of ATP and NADPH from the light-dependent reactions
    • D. RuBisCO is destroyed by darkness

  3. Question 3

    Which stage of photosynthesis: fixes carbon dioxide with the enzyme RuBisCO?

    • A. light-dependent reactions
    • B. Calvin cycle (light-independent)

  4. Question 4

    Which stage of photosynthesis: happens in the stroma?

    • A. light-dependent reactions
    • B. Calvin cycle (light-independent)

  5. Question 5

    Scientists gave algae water containing a heavy oxygen isotope (¹⁸O). Where did the ¹⁸O end up?

    • A. in the chlorophyll
    • B. in the oxygen gas released
    • C. in the glucose made
    • D. in the carbon dioxide absorbed

  6. Question 6

    Which stage of photosynthesis: uses ATP and NADPH to make sugar?

    • A. light-dependent reactions
    • B. Calvin cycle (light-independent)

  7. Question 7

    RuBisCO is often called the most abundant protein on Earth. What does it do?

    • A. makes oxygen
    • B. fixes carbon dioxide into organic molecules
    • C. absorbs light
    • D. splits water

  8. Question 8

    Which stage of photosynthesis: happen on the thylakoid membranes?

    • A. light-dependent reactions
    • B. Calvin cycle (light-independent)

Free from eurekami.com

for the adult only

Answer key: Light-dependent reactions and the Calvin cycle

  1. 1. B. The Calvin cycle only happens at night.

  2. 2. C. It runs out of ATP and NADPH from the light-dependent reactions

  3. 3. B. Calvin cycle (light-independent)

  4. 4. B. Calvin cycle (light-independent)

  5. 5. B. in the oxygen gas released

  6. 6. B. Calvin cycle (light-independent)

  7. 7. B. fixes carbon dioxide into organic molecules

  8. 8. A. light-dependent reactions