Question:
Maryland mammoth tobacco is a short day plant. Its critical duration of darkness is $10$ hours. Under which of the following conditions will it not flower ?
Maryland mammoth tobacco is a short day plant. Its critical duration of darkness is $10$ hours. Under which of the following conditions will it not flower ?
Updated On: Jul 6, 2022
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The Correct Option is A
Solution and Explanation
A short day plant is the one that flowers on photoperiods shorter than the critical day length. As the critical duration of darkness in the Maryland mammoth tobacco is $10$ hours, i.e., it requires a minimum period of darkness of $10$ hours to flower. Thus under the conditions shown in option (a), the plant will not flower.
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Concepts Used:
Photoperiodism
Photoperiodism, the functional or behavioral response of an organism to changes of duration in daily, seasonal, or yearly cycles of light and darkness. Photoperiodic reactions can be reasonably predicted, but temperature, nutrition, and other environmental factors also modify an organism’s response. In animals, the regular activities of migration, reproduction, and the changing of coats or plumage can be induced out of season by artificially altering daylight. Birds, for example, have migrated north in the winter after having been exposed to reversed seasonal lighting in laboratories.