Cocklebur Will Not Flower If Exposed to 8 Hours of Dark

question 74

Multiple Choice

Cocklebur will not flower if exposed to 8 hours of dark and 16 hours of light.It will flower if exposed to 16 hours of dark and 8 hours of light.However,if the 16 hours of dark is interrupted with a brief period of light the cocklebur will not flower.Which of the following will trigger cocklebur to flower?

• A)short dark periods
• B)short light periods
• C)long light periods
• D)long dark periods

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