Interrupting the Night with a Flash of Light Can Trigger

question 59

Multiple Choice

Interrupting the night with a flash of light can trigger flowering in a long-day plant.Why doesn't introducing a short period of darkness during the day cause a short-day plant to flower?

• A)Sunlight contains enough far-red light to inhibit phytochrome induction of flowering.
• B)A brief dark period is not sufficient to trigger flowering.
• C)Phytochrome is only active in the dark.
• D)The circadian clock is less responsive during the day than at night.
• E)The phytochrome response also requires cool nighttime temperatures.

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