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WSDA Pest Control Operator (PCO) Practice Exam

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What type of weed germinates in spring, develops a root system, and forms a low-growing rosette?
Correct Answer:
Grows vegetatively for one year and flowers and seeds during the second year
Explanation:
The situation describes a biennial weed habit. Biennials germinate and grow vegetatively in the first year, forming a low-growing rosette and building a root system to store energy. In the second year, they use that stored energy to flower and set seeds. So the sequence—two-year life cycle with initial vegetative growth followed by flowering in the next year—is what defines a biennial. Other patterns don’t fit this two-year timeline: annuals complete their life cycle in one season, often flowering in the same year they germinate; perennials live for many years and can flower repeatedly; and a plant that grows vegetatively for one year and never flowers wouldn’t complete a reproductive cycle typical of weed life histories.

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