[Campbell Biology P.260] How is photosynthesis similar in C4 plants and CAM plants? | Practice Question

How is photosynthesis similar in C4 plants and CAM plants?

  • A: In both cases, only photosystem I is used.
  • B: Both types of plants make sugar without the Calvin cycle.
  • C: In both cases, rubisco is not used to fix carbon initially.
  • D: Both types of plants make most of their sugar in the dark.

Explanation

Both C4 and CAM plants have adaptations to minimize photorespiration by initially fixing carbon dioxide with an enzyme other than rubisco PEP carboxylase , forming a four-carbon compound. This allows them to concentrate CO2 before it enters the Calvin cycle.