A) daily phase cycle
B) circadian rhythm
C) biological clock
D) photoperiodism
Correct Answer: D
Solution :
Photoperiodism is the effect of duration of light and darkness on the growth, development and behaviour of plant. It is related with flowering of plants, formation of underground storage organ, leaf fall etc. The effect of photoperiod or flowering was discovered by Gamer and Allard (1920) in case of maryland mammoth variety of tobacco. Circadian rhythm (Diurnal Rhythm) is any 24 hour periodicity in the behaviour or physiology of animals or plants, eg, sleep/activity cycle in many animals and the growth movement of plants. Biological Clock is the mechanism, presumed to exist within many animals and plants that produce regular periodic changes in behaviour or physiology.
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