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

question 25

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.
• E) are correlated with moisture availability.

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