The Photosynthesis 2 Step - rocklin.k12.ca.us

The Photosynthesis 2 Step!!!

Directions: Use the diagram below to answer the following questions.

1. Write the 3 reactants and the 2 products of photosynthesis. Reactants ? Light, water (H2O) & carbon dioxide (CO2) Products ? Oxygen (O2) & Sugar/Glucose (C6H12O6)

2. Photosynthesis occurs in two steps. From the diagram above what are the names of the two steps of photosynthesis?

Light Reactions & Calvin Cycle 3. What are the 2 reactants (from #1) that are used in the Light Reaction?

Light & water (H2O) 4. What is the product of the Light Reaction that is also a reactant of Respiration?

Oxygen (O2) 5. ATP and NADPH are like "re-chargeable batteries". What do you think is the major function of the Light Reaction?

To "recharge" ATP & NADPH. 6. Specifically, where does the light reaction occur in a plant cell?

In the thylakoid membranes. 7. What is the 1 reactant and 1 product (from #1) of the Calvin Cycle?

Reactant ?carbon dioxide (CO2) Product ?Sugar/Glucose (C6H12O6) 8. Why do you think the Calvin Cycle is also called the "Dark Reaction"? It does not require light. 9. What do you think is the function of the ATP and the NADPH for the Calvin Cycle?

They supply energy & electrons for the Calvin Cycle. 10. What is the chemical formula for Glucose? Carbon Dioxide?

Glucose (C6H12O6), carbon dioxide (CO2) 11. How many Carbon Dioxide molecules are required to make 1 glucose molecule?

6 CO2 1 C6H12O6 12. Where does the Hydrogen (H) in a glucose molecule come from?

water (H2O) 13. What is the product of the Calvin Cycle that is also a reactant of respiration?

Glucose (C6H12O6) 14. The oxygen that is produced in the Light Reaction was originally a part of which

reactant?

water (H2O) 15. If you were looking at a water plant, how would you know if it was performing

photosynthesis? It would produce bubbles of oxygen gas.

Summarize each of the steps of Photosynthesis in the table below. Make sure to include

the reactants, the products and the overall purpose of each step. Use complete sentences and correct spelling (make your English teachers and your Biology teachers proud).

Light Reaction

Calvin Cycle

Answers will vary.

Answers will vary.

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