Stratification usually refers to extended exposure to ________________ that is required for some seeds to germinate?

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Stratification refers to the process of subjecting seeds to a period of chilling, which can break down dormancy and stimulate germination. This is especially important for some plant species that evolved in cold climates where winters are long, and seeds must remain dormant until spring. Therefore, exposure to low temperatures (chilling) is needed for stratification, not the other options.

Stratification Usually Refers to Extended Exposure to ________________ That Is