Question

The common name of pea is simpler than its botanical (scientific) name Pisum sativum why then is the simpler common name not used instead of the complex scientific/botanical name is biology ?

Answer 1

The common or vernacular names changes with the change in place, causing confusion regarding the identification fo specific specimen, whereas the complex scientific names are in latin and universely accepted and understood
Hence, scientific names are preferred over the common vernacular names.