Which term describes a weed that completes its life cycle in two years?

• A. Annual Weed
• B. Biennial Weed
• C. Perennial Weed
• D. Ephemeral Weed

Answer: (B)

The concept here is the length of time a weed needs to complete its life cycle. A two-year cycle is called a biennial. In the first year a biennial often grows vegetatively (sometimes forming a rosette) and stores energy. It overwinters, and in the second year it resumes growth, flowers, sets seed, and then dies. That two-year pattern sets it apart from annual weeds, which complete everything in one growing season, and perennial weeds, which persist for multiple years and can reproduce over several seasons. Ephemeral weeds describe very short-lived plants, not a two-year life cycle, so they don’t fit this description.