What is meant by photoperiod ? How does it affect the completion of life cycle of a plant ?

Dear Student,

Photoperiodism refers to the response of plants with respect to the duration of light (i.e., period of day and night). On the basis of its response to the duration of light, a plant is classified as a short-day plant, a long-day plant, or a day-neutral plant. Short-day plants flower when they are exposed to light for a period less than the critical day-length (for example: Chrysanthemum). Long-day plants flower when they are exposed to light for a period more than the critical day-length (for example: radish). When no marked correlation is observed between the duration of exposure to light and the flowering response, plants are termed as day-neutral plants (for example: tomato).  

 For germination, flowering, growth, plants depends on photoperiods. Thus, if it is not obtaining enough amount of sunlight, it may hinder the plant's physiological and developmental processes. Thereby resulting in stunted growth, delayed flowering, delayed fruit-setting and maturation or sometimes it may become lethal to the plant as well etc.

Hope this information will clear your doubts about the incomplete dominance.

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