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What characteristic defines a biennial weed?

  1. Completes its life cycle in one year

  2. Completes its life cycle in two years

  3. Grows for an indefinite number of years

  4. Grows only in the winter

The correct answer is: Completes its life cycle in two years

A biennial weed is a plant that completes its entire life cycle in two years. This means that it germinates and grows in the first year, then reproduces and dies in the following year. This distinguishes it from an annual weed that completes its life cycle in one year, and a perennial weed that grows for an indefinite number of years. Winter annual weeds, which grow only in the winter, also complete their life cycle in one year, so they would not be considered biennial weeds.