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| Q. |
Which of the following is true for photoperiodic? |
| A. | It occurs only in plants |
| B. | It is related to flowering in plants |
| C. | It is related to feathers of animals |
| D. | It is the reaction of organisms to the length of day or night |
| Answer» D. It is the reaction of organisms to the length of day or night | |
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Explanation: Photoperiodism is the physiological reaction of organisms to the length of day or night. The term "Photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photo period: therelative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle. |
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