[Campbell Biology P.892] What is the specific environmental cue that triggers de-etiolation ... | Practice Question

What is the specific environmental cue that triggers de-etiolation greening in a dark-grown potato plant, and what pigment is responsible for its reception?

  • A: Darkness; Auxin
  • B: Light; Phytochrome
  • C: Humidity; Gibberellin
  • D: Temperature; Cytokinin

Explanation

The text states that de-etiolation begins with the reception of light by a specific pigment called phytochrome Figure 39.2b . Therefore, light is the environmental cue, and phytochrome is the receptor.