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

Which of the following definitions best describes 'Duration of female phase'?

A. Report the number of leaves emitted until the leaf bearing the first inflorescences from 30 randomly selected palms, calculate mean.
B. Visit inflorescence daily from the moment of opening. Note dates when first female flowers open and when and the last female flowers open. Record number of days betwen these dates. Observe on 30 palms, calculate standard deviation.
C. Measure the the concept, the measurement starting at 1.5m above the ground level.
D. Visit inflorescence daily from the moment of opening. Note dates when last male flowers and first female flowers of the same inflorescence open. Record number of days betwen these dates as a positive number if last male flowers come first, as a negative number if first female flowers come first. Observe on 30 palms, calculate mean.

Answer: Visit inflorescence daily from the moment of opening. Note dates when first female flowers open and when and the last female flowers open. Record number of days betwen these dates. Observe on 30 palms, calculate standard deviation.