| Photoperiodism | Vernalization |
| $(1)$ 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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