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complex enzymatic and biochemical process that certain plant embryos must undergo before they will germinate. It results at least in part from rapid and extensive water loss because of the conversion of soluble nutrients to their stored forms. This interruption of growth, or the lack of it in the seeds of many tropical plants, may be an adaptation to seasonal and climatic changes. Afterripening provides for germination at the most favourable time, when conditions of moisture, temperature, and day length are most conducive to plant growth. Many cereals and grasses require afterripening, which prevents them from germinating in the ear under moist conditions. See also germination.