After Setting the Correct Photoperiod, the Managers of a Greenhouse

question 55

Multiple Choice

After setting the correct photoperiod, the managers of a greenhouse still do not have blooming roses. Which of the following possibilities would most likely have contributed to the problem?

• A) The heating system allowed for fluctuations in temperature between 20°C and 25°C.
• B) The furnace mechanic accidentally turned off the lights for an hour two days in a row.
• C) The cleaning crew turned the lights on for an hour three nights in a row.
• D) All of the above
• E) None of the above