Plants often use changes in day length (photoperiod) to trigger events such as dormancy and flowering. It is logical that plants have evolved this mechanism because photoperiod changes ________.
A) are more predictable than air temperature changes
B) predict moisture availability
C) are modified by soil temperature changes
D) can reset the biological clock

Question

Quizplus · Accepted Answer

Photoperiod changes are more predictable than air temperature changes as the length of daylight hours follows a pattern over the course of a year. Temperature changes can be more variable and less able to predict events such as dormancy and flowering.

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