Plants that complete their life cycle in one year are known as what?

Plants that complete their life cycle in one year are classified as annuals. This means they typically germinate from seed, grow, flower, produce seeds, and die all within a single growing season. Annuals can be further divided into summer and winter varieties, depending on the season in which they grow.

In contrast, perennials are plants that live for more than two years, growing and flowering over multiple seasons. Biennials take two years to complete their life cycle, usually growing vegetatively in the first year and flowering in the second. Succulents refer to a group of plants that have thick, fleshy parts adapted to retain water, and they can be annual, biennial, or perennial depending on the species. Thus, the term annual specifically denotes those plants whose life cycle is confined to just one year, making the correct answer obvious.