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5. Compare and contrast C3, C4, and CAM photosynthesis.

5. Compare and contrast C3, C4, and CAM photosynthesis.

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Answer #1

Comparison and contrast table of C3, C4, and CAM plants

Plant Characteristic

C3 Pathway

C4 Pathway

CAM Pathway

Photorespiration Rate

High

Low / Negligible

Very Low / Negligible

Leaf Anatomy

Typical

Kranz

Xeromorphic

Typical Environments for growth

All

Tropical, elevated daytime temperatures, drought

Dry, arid

Stoma Open During the Day?

Yes

Yes

No

Number of Steps in Pathway

1

2

2

First Molecule Produced in Pathway

3-phophoglyceric acid

Malic acid or aspartic acid

Malate

Uses the Calvin Cycle?

Yes

Yes

Yes

1st CO2 acceptor

RuBP (Ribulose-1,5-bisphosphate)

PEP (Phosphoenolpyruvate)

PEP (Phosphoenolpyruvate)
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