The concept of phenotypic plasticity in ecological forms is associated with:
An ecad is a phenotypic form produced by environmental conditions within the plastic response of a genotype. Genetically similar plants, for example, may develop different leaf thickness, stature, or branching in sun, shade, wet, or dry habitats. These changes need not involve allele-frequency divergence and may disappear when individuals are transferred to a common environment. This is phenotypic plasticity: one genotype generates different phenotypes across environments, represented by its reaction norm. An ecotype differs because local traits are genetically based and remain heritable in a
Ref: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation