Question

on which basis syncarpous and apocarpous is divided

Answer 1

The carpels may have distinct locules divided by walls called septa.

Answer 2

If a gynoecium has multiple, distinct (free, unfused) carpels, it isapocarpous. If a gynoecium has multiple carpels "fused" into a single structure, it is syncarpous. ... Within the compound ovary, the carpels may have distinct locules divided by walls called septa.