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Environmental rhythms of light and darkness produce
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Photoperiodism is the phenomenon in which various physiological reactions response to the relative length of dark or light periods. Environmental rhythms of light and darkness produce this effect. It was discovered by W. W. Garner and H. A. Allard. Short day plants are those plants that begin flowering when the days are shorter than their critical day length. They require long period of darkness and short period of light to flower. Long day plants are those plants that begin flowering when the days are longer than their critical day length. They will flower when they are exposed to short period of darkness and long period of light.
Thus, the correct answer is option A.
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Question 2
Many flowering plants use light-detecting pigments called phytochromes, which serve to trigger growth and development in response to environmental signals. This response to relative lengths of light and dark periods is known as photoperiodism, and flowering plants respond to seasonal changes in light by flowering at different times of the year.While many flowering plants in the northern hemisphere produce flowers in the spring and summer (long day/short night plants), some plants only flower in the fall and winter (short day/long night plants).
In the 1940's research was conducted with series of controlled experiments, which involved monitoring flowering plants in light-tight boxes where the length of light and dark was manipulated. The experimental results are summarized in Figure above:
Using data from Figure, what is the question the researchers were attempting to answer?
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| Question Text | Environmental rhythms of light and darkness produce |
| Answer Type | Text solution:1 |
| Upvotes | 150 |
