Question

Which of the following is the best explanation of the physiological reaction to the length of daylight hours often referred to as photoperiodism? Group of answer choices Plants will only flower during long day periods when the day length exceeds their necessary photoperiod. Plants are able to respond to photoperiodism, but animals are not. Migration is triggered by temperature change and not by photoperiodism. Hibernation is often triggered by photoperiodism.

Answer 1

Photoperiodism is the physiological reaction of organisms, particularly plants, to the length of daylight hours. Plants rely on the length of the dark period as a signal to flower, with long-day plants flowering when the day length exceeds their necessary photoperiod, and short-day plants flowering when the day length is shorter than their necessary photoperiod.

Step-by-step explanation:

Photoperiodism is the physiological reaction of organisms, particularly plants, to the length of daylight hours. Many flowering plants rely on the length of the dark period, or night length, as a signal to flower. Long-day plants flower when the length of daylight exceeds their necessary photoperiod, while short-day plants flower when the day length is shorter than their necessary photoperiod. Examples of long-day plants include carnations, clover, lettuce, wheat, and turnips, while short-day plants include cotton, rice, and sugar cane.