Final answer:
The main idea is that not all plants grow the same way, with variations among annuals, biennials, and perennials in their growth and reproductive cycles.
Step-by-step explanation:
The main idea of the passage is that "Not all plants grow in the same way." This statement encompasses the concept that some plants, known as annuals, grow and reproduce within a single year, while others called biennials take two years to complete their life cycle. There are also perennials, which can grow and reproduce over many years, completing a life cycle that spans longer than that of annuals and biennials.
For example, annuals like the Arabidopsis complete their life cycle in one growing season, while biennials like carrots have a vegetative phase in their first year and a reproductive phase in their second. Perennials, such as magnolias, have life cycles that extend over two or more years, with examples of polycarpic perennials like apple and orange trees flowering multiple times across their lifespan.The main idea is that not all plants grow in the same way. Some plants grow and reproduce in one year and are called annuals. Examples of annual plants include Arabidopsis and certain garden plants that are killed by frost. Other plants grow and reproduce in two years and are called biennials. Carrots are an example of biennial plants. And finally, there are plants that grow and reproduce for many years, which are called perennials. The magnolia tree is an example of a perennial plant.