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

question 23

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) predict moisture availability
• C) are modified by soil temperature changes
• D) can reset the biological clock