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Long day plants produces flowers when they exposed to :-

Option: 1

Any duration of light

Option: 2

Light period longer than a critical day length

Option: 3

Light period longer than 12 hrs

Option: 4

Light period shorter than a critical day length

Answers (1)


The light period which is essentially required to induce flowering in plants is known as critical photoperiod. A long day plant will only flower when the light period is longer than a critical number of hours. Spinach, lettuce, and some varieties of wheat are long-day plants.

Hence the correct option is b. 

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