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Photosynthesis
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Uses ATP and NADPH from light reaction as energy

Uses CO2

To produce glucose: it takes 6 turns and uses 18 ATP and 12 NADPH.

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Chloroplast

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Calvin Cycle (C3 fixation)

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Calvin Cycle

Remember: C3 = Calvin Cycle

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Photorespiration

Occurs on hot, dry, bright days

Stomates close

Fixation of O2 instead of CO2

Produces 2-C molecules instead of 3-C sugar molecules

Produces no sugar molecules or no ATP

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Photorespiration

Because of photorespiration, plants have special adaptations to limit the effect of photorespiration:

1. C4 plants

2. CAM plants

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C4 Plants

Hot, moist environments

15% of plants (grasses, corn, sugarcane)

Photosynthesis occurs in 2 places

Light reaction - mesophyll cells

Calvin cycle - bundle sheath cells

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C4 Plants

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CAM Plants

Hot, dry environments

5% of plants (cactus and ice plants)

Stomates closed during day

Stomates open during the night

Light reaction - occurs during the day

Calvin Cycle - occurs when CO2 is present

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CAM Plants

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Question:

Why do CAM plants close their stomata during the day?

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Cam plants close their stomata in the hottest part of the day to conserve water

Cam plants close their stomata in the hottest part of the day to conserve water

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