[Campbell Biology P.847] Which of the following is a characteristic adaptation of xerophytes... | Practice Question

Which of the following is a characteristic adaptation of xerophytes, particularly CAM plants, to arid environments?

  • A: CAM plants absorb CO2 primarily during the day when evaporative stresses are highest.
  • B: Many xerophytes have extensive leaves to maximize photosynthesis surface area.
  • C: Fleshy stems in some xerophytes serve to store water for long dry periods.
  • D: Xerophytes typically complete their life cycle during prolonged dry seasons.

Explanation

Xerophytes have evolved various adaptations to survive in dry environments. Fleshy stems are common in many xerophytes e.g., cacti for water storage. CAM photosynthesis allows plants to open stomata at night to take in CO2 and keep them closed during the hot, dry day, significantly reducing water loss.