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  4. The essential distinction between long-day and short-day plants is that flowering in long day plants is promoted only when the day length exceeds a certain duration, called the .

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Q. The essential distinction between long-day and short-day plants is that flowering in long day plants is promoted only when the day length exceeds a certain duration, called the ______________.

Plant Growth and Development

Solution:

The period of daylight appears to initiate flowering in long-day plants or inhibit flowering in short-day plants. In actual fact, long-day plants will not flower if the dark period exceeds a certain maximum and conversely short-day plants will not flower unless the dark period exceeds a certain minimum. These periods are termed critical dark periods and must be continuous to have effect.