[Campbell Biology P.878] Which of the following environmental factors is NOT described as a ... | Practice Question

Which of the following environmental factors is NOT described as a primary cue to break seed dormancy for some plant species, according to the provided text?

  • A: Substantial rainfall.
  • B: Intense heat or smoke from fires.
  • C: Extended exposure to cold.
  • D: Prolonged exposure to darkness.

Explanation

The text mentions that 'Many small seeds require light for germination, an adaptation that prevents them from germinating when they are buried so deeply in the soil that their energy reserves would be exhausted before their plumules could reach sunlight.' This implies that prolonged darkness would prevent germination for these seeds, not break dormancy. The other options are explicitly stated as cues to break dormancy.