Which of the following is a correct definition of annuals?

The correct definition of annuals is that they are plants that complete their life cycle in a single year. This means that from germination to flowering, seed production, and then death occurs within a 12-month period. Annual plants typically germinate in the spring, grow, produce seeds, and die before the frost returns in the fall or winter. This lifecycle strategy allows them to quickly exploit favorable growing conditions, reproduce, and ensure their genetic material is passed on to the next generation in a short time frame.

In contrast, other options do not accurately define annuals. Some plants may only grow during specific seasons or over several years, which describes biennials and perennials rather than annuals. A true understanding of annuals helps in managing these plants in various agricultural and landscaping contexts, ensuring proper planting schedules and care practices are implemented.