[Campbell Biology P.254] Which of the following statements correctly differentiates between ... | Practice Question

Which of the following statements correctly differentiates between C3, C4, and CAM plants based on the provided text?

  • A: Corn is a C3 crop, while velvetleaf is a C4 weed, and C3 plants are generally more efficient in water usage.
  • B: C4 photosynthesis, exemplified by rice, is considered more efficient than C3 photosynthesis in terms of water and resource use.
  • C: CAM plants, like pineapples, open their stomata at night to conserve water, which is the reverse behavior of C3 and C4 plants.
  • D: Increased CO2 concentration benefits C4 plants significantly more than C3 plants, as shown by the experimental data.

Explanation

The text states that CAM plants, such as pineapples, open their stomata at night and close them during the day. This is explicitly contrasted with the behavior of other plants implying C3 and C4, which generally open stomata during the day as a water conservation strategy. The other options contain inaccuracies regarding plant types corn is C4, velvetleaf is C3 or misinterpret the experimental data C3 velvetleaf benefited more from increased CO2 than C4 corn in this study .