How are dicots defined in plant classification?

Dicots, or dicotyledons, are a classification of angiosperms characterized by having two seed leaves, known as cotyledons. This trait is fundamental in botany, as it distinguishes dicots from monocots, which have only one seed leaf. The presence of two cotyledons influences various aspects of plant development, including leaf structure, flower parts, and overall growth patterns.

For instance, many dicots tend to have broad leaves with a network of veins, while their flowers are typically arranged in multiples of four or five. This distinction plays a crucial role in plant identification and classification. Understanding that dicots are defined by having two seed leaves helps in recognizing their importance within the vast diversity of flowering plants.

In the context of the other options, they either misrepresent the characteristics of dicots, such as inaccurately associating them with having three seed leaves or with lacking vascular systems, which is not applicable to any angiosperms. Recognizing these botanical characteristics ensures a clearer understanding of plant classification within horticulture and botany.