Differentiate between Photoperiodism and Vernalization.

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PhotoperiodismVernalization
$(1)$ Photoperiodism is the flowering response of plants to the relative duration of light and dark periods in a diurnal cycle.$(1)$ Vernalization is the promotion of flowering by a period of low temperature (chilling treatment).
$(2)$ The stimulus is perceived by the leaves.$(2)$ The stimulus is perceived by the shoot apical meristems,embryos,or leaves.
$(3)$ It involves the production of a hypothetical hormone called florigen.$(3)$ It involves the production of a hypothetical hormone called vernalin.
$(4)$ It is primarily concerned with the timing of flowering based on day length.$(4)$ It is primarily concerned with preventing precocious reproductive development late in the growing season.

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