Task: Class Definition Understanding (ontology: Food_Agriculture/Crop_Ontology)

Which of the following definitions best describes 'Culm number'?

A. Thickness of grain with hull
B. Area of an air space in a cross-section of the culm
C. Total number of reproductive and non-reproductive tillers after full heading
D. the concept defined as distance from the soil surface to the highest point of the plant (panicle or flag leaf) excluding awns

Answer: Total number of reproductive and non-reproductive tillers after full heading