Biology  by Bradford
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3.4 Photosynthesis: revision map

The subtopic in the middle and five tasks round it: label two diagrams, complete a table, put a process in order and fill 15 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.

Unit 3 practice questionsThe whole Unit 3 map

Topic 3.4

Photosynthesis

AP Biology · Unit 3 Cellular EnergeticsName

3.4.A, 3.4.BLight reactions on the thylakoid membrane

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3.4.ACapturing light

Chlorophyll absorbs mostly red and blue light and reflects light, so leaves look green. Absorbed energy excites electrons in photosystem II. They pass along an electron transport chain, and the energy released pumps protons into the thylakoid space. Protons flow back through ATP synthase, which makes ATP by . Water is split to replace the electrons, releasing oxygen. The overall change: carbon dioxide and water become glucose and oxygen, with light as the energy source.

3.4.BThe Calvin cycle

Number the steps in order.

  1. Some G3P leaves the cycle to be made into glucose and other organic molecules.
  2. The six-carbon product splits into two three-carbon molecules.
  3. The rest is used, with more ATP, to regenerate RuBP.
  4. ATP and NADPH reduce these to G3P.
  5. Rubisco attaches CO₂ to RuBP, a five-carbon sugar: carbon fixation.
Topic 3.4Photosynthesis

3.4.AA chloroplast

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3.4.A, 3.4.BTwo stages

Light reactionsCalvin cycle
Wherethylakoid membranes
Needslight, water, ADP, NADP⁺CO₂, ATP,
MakesATP, NADPH and , which becomes glucose
Energylight energy to chemical energyATP and NADPH energy fixes carbon
Word bank ATP synthasechemiosmosiselectron transport chainG3PgranumgreenNADPHouter membraneoxygenphotosystem Iphotosystem IIstromathylakoidthylakoid lumen

Answer key

Every box on the sheet with its gaps filled in, as the subtopic reads in full.

  1. LabelLight reactions on the thylakoid membrane

    1. photosystem II
    2. electron transport chain
    3. photosystem I
    4. ATP synthase
    5. thylakoid lumen

  2. LabelA chloroplast

    1. outer membrane
    2. granum
    3. thylakoid
    4. stroma

  3. TableTwo stages

    Light reactionsCalvin cycle
    Wherethylakoid membranesstroma
    Needslight, water, ADP, NADP⁺CO₂, ATP, NADPH
    MakesATP, NADPH and oxygenG3P, which becomes glucose
    Energylight energy to chemical energyATP and NADPH energy fixes carbon

  4. OrderThe Calvin cycle

    1. Rubisco attaches CO₂ to RuBP, a five-carbon sugar: carbon fixation.
    2. The six-carbon product splits into two three-carbon molecules.
    3. ATP and NADPH reduce these to G3P.
    4. Some G3P leaves the cycle to be made into glucose and other organic molecules.
    5. The rest is used, with more ATP, to regenerate RuBP.

  5. GapsCapturing light

    Chlorophyll absorbs mostly red and blue light and reflects green light, so leaves look green. Absorbed energy excites electrons in photosystem II. They pass along an electron transport chain, and the energy released pumps protons into the thylakoid space. Protons flow back through ATP synthase, which makes ATP by chemiosmosis. Water is split to replace the electrons, releasing oxygen. The overall change: carbon dioxide and water become glucose and oxygen, with light as the energy source.