Plants often use changes in day length (photoperioD) to trigger events such as dormancy and flowering. Which of the following best explains why day-neutral plants are more common in the tropics than in temperate zones?
A) In the tropics there is little photoperiodic change during the year.
B) Warm temperature in the tropics denatures phytochrome pigments.
C) The biological clock runs faster in the warm tropics.
D) Precipitation change is more predictable than photoperiodic change during the year.

Question

Quizplus · Accepted Answer

Day-neutral plants do not rely on photoperiodic changes to trigger key life events. In the tropics, where there is little variation in day length throughout the year, these plants thrive because their growth and reproductive cycles are not limited by significant changes in photoperiod.

Plants Often Use Changes in Day Length (PhotoperioD) to Trigger