Which type of grass is known to be an annual?

Wild Oats are categorized as annual grasses, meaning they complete their life cycle—growing from seed, flowering, creating new seeds, and dying—within a single year. Being an annual allows them to rapidly colonize disturbed areas, making them common in agricultural settings.

While Downy Brome, or Cheatgrass, is also an annual grass, Quackgrass is a perennial. This distinction between annual and perennial is important for understanding weed management and agricultural practices. The life cycle of annuals like wild oats presents different challenges compared to perennials, which tend to regrow year after year.

Thus, identifying wild oats as the correct answer is appropriate because they are the representative annual grass highlighted in this question.