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)alter the amount of energy available to the plant.
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 they are determined by the Earth's rotation and orbit. Hence, plants can use photoperiod as a reliable signal for triggering events such as dormancy and flowering.

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