Important features used to identify grassy weeds include:

• A. Leaf shape
• B. Auricles and ligules
• C. Leaf arrangement
• D. All of the above

Answer: (B)

Grasses carry distinctive leaf structures at the base that are reliable clues for identification, especially the ligule and the auricles. The ligule is a small membrane or fringe at the junction between the leaf blade and the leaf sheath, and the auricles are small ear-like projections that clasp or wrap around the stem. These features are characteristic of grasses and help separate grassy weeds from many broadleaf plants. Leaf shape or how leaves are arranged can vary a lot and may not reliably distinguish grasses from other plants on their own, so the ligule and auricles provide the strongest, most consistent diagnostic signal.