Class 11 Biology Plant Physiology Plant Growth and Development



Environmental rhythms of light and darkness produce
(a)
Photoperiodism
(b)
Phototropism
(c)
Phototaxis
(d)
Vernalisation
Correct answer: (a) 
Solution: 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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Similar topics
plant growth and development
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plant growth and development
transport in plants
respiration in plants
mineral nutrition
morphology of flowering plants