What term describes the structure at the junction of a grass leaf blade and leaf sheath?

What term describes the structure at the junction of a grass leaf blade and leaf sheath?

• A. Ligule
• B. Inversion
• C. Label
• D. Larva

Answer: (A)

The ligule is the small structure at the junction where the leaf blade meets the leaf sheath on grasses. It appears as a tiny membranous or hairy strip tucked at the inside edge where the blade attaches to the sheath, forming a little boundary between the two parts. This feature helps seal and align the blade with the sheath, keeping debris and excess moisture from entering the junction and aiding the leaf’s folding and growth. Some grasses have a prominent membranous ligule, others a short fringe, but its basic role is this junctional boundary. Inversion, label, and larva aren’t related to grass leaf anatomy.

The ligule is the small structure at the junction where the leaf blade meets the leaf sheath on grasses. It appears as a tiny membranous or hairy strip tucked at the inside edge where the blade attaches to the sheath, forming a little boundary between the two parts. This feature helps seal and align the blade with the sheath, keeping debris and excess moisture from entering the junction and aiding the leaf’s folding and growth. Some grasses have a prominent membranous ligule, others a short fringe, but its basic role is this junctional boundary. Inversion, label, and larva aren’t related to grass leaf anatomy.