What distinguishes a monocot from a dicot?

The distinction between monocots and dicots primarily lies in the number of seed leaves, or cotyledons, they possess. Monocots are characterized by having a single cotyledon, while dicots contain two. This fundamental difference remains crucial in plant classification and has significant implications for their growth patterns, leaf structure, and overall anatomy.

In addition to the cotyledon count, monocots generally exhibit parallel venation in their leaves, while dicots typically show a branched, netted venation pattern. However, these features are secondary to the primary distinction of seed leaf number. The size of the plants also varies but is not a definitive criterion for classification between monocots and dicots, as many exceptions exist. Thus, the correct answer accurately reflects a key botanical classification principle regarding these two groups of flowering plants.