Does the root of Trapa contain diarch xylem?

False. The root of Trapa (water chestnut) does not contain diarch xylem (two strands of protoxylem). Instead, Trapa roots are typically tetrarch or polyarch, meaning they have four or more protoxylem groups. Aquatic and semi-aquatic plants like Trapa often show polyarch conditions to facilitate efficient water and nutrient absorption from their aquatic environment. The number of protoxylem groups (xylem ridges) in a root is an important diagnostic feature used in plant identification and reflects adaptations to specific environmental conditions. Diarch xylem (two protoxylem groups) is more commonly found in dicot roots growing in terrestrial conditions, while monocots and aquatic plants typically exhibit polyarch arrangements.