Assertion:  Alpha diversity is said to be higher if the dissimilarity between communities is higher.
Reason: Alpha diversity is a measure of diversity between the communities.

Both Assertion (A) and Reason are false (F ).

Alpha diversity (within-community diversity) refers to the diversity of organisms sharing the same community/ habitat. A combination’ of species richness and equitability/evenness is used to represent diversity within a community or habitat. Generally, greater the species richness, greater is the species diversity. Species frequently change when habitat or community changes. The rate of replacement of species along a gradient of habitats or communities is called beta diversity between-community diversity. Higher the heterogeneity in the habitats in a region or greater the dissimilarity between communities, higher is the beta diversity. Diversity of the habitats over the total landscape or geographical area is called gamma diversity.