A long day plant flowers only if exposed to a light period

more than its critical day length.

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less than its critical day length.

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equal to its critical day length.

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slightly less than its critical day length.

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Solution

The correct option is A more than its critical day length.
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.

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