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

question 5

Multiple Choice

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.