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 ?

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

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.