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

Which of the following definitions best describes 'Calculate standard deviation of length of central axis'?

A. Measure the girth or circumference of the stalk just below the first spikelets from 30 randomly selected palms. Calculate mean.
B. Measure inflorescence central axis from the first spike to the end from 30 randomly selected palms. Calculate standard deviation.
C. Visit inflorescence daily from the moment of opening. Note dates when last female flowers and first male flowers of next inflorescence open. Record number of days betwen these dates as a positive number if last female flowers of current inflorescence come first, as a negative number if first male flowers of next inflorescence come first. Observe on 30 palms, calculate mean.
D. Measure the girth or circumference of the stem at 1.5m above the ground level using a measuring tape (tape strapped around the stem). Calculate standard deviation from 30 randomly selected palms.

Answer: Measure inflorescence central axis from the first spike to the end from 30 randomly selected palms. Calculate standard deviation.