India has more than 1000 varieties of mango. This is an example of:

The correct answer is Option (2) → Genetic diversity

Biodiversity exists at three levels: genetic, species and ecological. All the mango varieties belong to one species; they differ only in their genes, which is diversity at the genetic level.

Option (1) Species diversity — Incorrect. Species diversity is the number of different species in a region, e.g. the Western Ghats have more amphibian species than the Eastern Ghats.

Option (2) Genetic diversity — Correct. Many varieties of a single species show diversity at the genetic level.

Option (3) Family diversity — Incorrect. There is no such level of biodiversity.

Option (4) Ecological diversity — Incorrect. It is the variety of ecosystems in a region, such as deserts, rain forests, mangroves, coral reefs and wetlands.

NCERT Extract:
Biodiversity – …