Which type of plant completes its lifecycle in one year?

The correct choice is a plant that completes its lifecycle in one year is classified as an annual. Annual plants germinate, grow, flower, and produce seeds all within the span of a single growing season. This rapid lifecycle allows them to take full advantage of favorable conditions, such as sunlight and moisture, typically found during one year before they die off. The following year, new seedlings grow from the seeds that were produced, continuing the cycle.

In contrast, perennial plants live for more than two years, often returning year after year. Biennial plants require two years to complete their lifecycle, typically growing vegetatively in the first year and flowering in the second year. Deciduous plants refer to trees or shrubs that shed their leaves seasonally and can be either annual or perennial, but this term does not specifically categorize the length of the lifecycle.