Iris Is a Long-Day Plant That Normally Flowers in the Spring

question 22

Multiple Choice

Iris is a long-day plant that normally flowers in the spring. Which regimen would be the most effective in making an iris bloom in late fall?

• A) interrupting the plant's nights at 2:00 am with a flash of far-red light
• B) interrupting the plant's nights at 2:00 am with a flash of red light followed by a flash of far-red light
• C) interrupting the plant's nights at 2:00 am with a red flash, then a far-red flash, then a red flash
• D) interrupting the plant's days at 2:00 pm by putting it in the dark

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