Which of the following is true about monocotyledonous plants?

Monocotyledonous plants, commonly referred to as monocots, are characterized by having only one cotyledon in their seeds. This is a distinguishing feature when compared to dicotyledonous plants, which possess two cotyledons. Additionally, monocots typically exhibit flower structures that occur in multiples of three, a trait that sets them apart in flowering plant morphology.

The leaf structure in monocots often features parallel veins rather than branched and netted patterns, which are more commonly found in dicots. Moreover, monocots can thrive in a variety of climates, not limited to temperate regions but also including tropical and subtropical zones. Thus, the statement regarding their flower parts aligning with multiples of three accurately reflects a key characteristic of monocots.