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Photosynthesis: Two Connected Stages
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Photosynthesis: Two Connected Stages
Use your knowledge of photosynthesis to complete each task. In written responses, distinguish matter inputs from the energy carriers that link the two stages.
Trace the Connections
Use your knowledge of chloroplast structures and photosynthesis to answer the next questions.
1.Which chloroplast structure contains the membranes where the light-dependent reactions take place?
- Thylakoid membranes
- Stroma
- Outer membrane
- Cytoplasm
2.Match each photosynthesis term to its best description.
- Thylakoid membrane
- Stroma
- ATP
- NADPH
- Carbon dioxide
- Oxygen
- G3P
- Water
- Gas released when water is split in the light-dependent reactions
- Carbon-containing input for the Calvin cycle
- Fluid-filled chloroplast region where the Calvin cycle occurs
- Site of the light-dependent reactions
- Electron-carrying molecule used in sugar-building reactions
- Molecule split during the light-dependent reactions
- Energy-carrying molecule used by the Calvin cycle
- Three-carbon sugar product that can be used to make glucose
3.A plant cell has plenty of carbon dioxide but cannot produce ATP or NADPH. Which outcome is most likely?
- The Calvin cycle cannot build G3P at its usual rate because it lacks energy and reducing power.
- The light-dependent reactions will use carbon dioxide to release oxygen.
- The Calvin cycle will move into the thylakoid membranes and continue normally.
- The cell will make extra ATP from G3P without needing light.
4.In which chloroplast region does the Calvin cycle occur, and what carbon-containing molecule enters it?
Follow Matter and Energy
Remember: atoms are rearranged during photosynthesis, while energy is transferred between molecules.
5.Which statement correctly describes what happens to water during the light-dependent reactions?
- Water is split; oxygen is released, and its electrons help support energy transfer.
- Water is combined with glucose to release carbon dioxide.
- Water supplies the carbon atoms that become G3P.
- Water is made in the Calvin cycle and sent to the thylakoids.
6.A leaf is illuminated and has water available, but carbon dioxide is removed from its surroundings. Which direct effect is expected?
7.Explain how the two stages of photosynthesis depend on one another. Name the location of each stage, one input and one output for each, and how ATP or NADPH links them.
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