NEET BIOLOGY

Detailed explanation-1: -The simplest measure of diversity, the number of species in a given area, is called within-area diversity or, technically, alpha diversity.

Detailed explanation-2: -Biodiversity is often measured as the species count in a given area, be it a single tree, an ecosystem, a landscape or region, or the planet as a whole. However, biodiversity may be measured in other ways. BIODIVERSITY MAY BE MEASURED AS GENETIC DIVERSITY.

Detailed explanation-3: -Measurements of biodiversity seldom capture all its dimensions, and the most common measure-species richness-is no exception. While this can serve as a valuable surrogate measure for other dimensions that are difficult to quantify, there are several limitations associated with an emphasis on species.

Detailed explanation-4: -Species richness, as measure of diversity, has been used by ecologists. Species density or the number of species per m2 is most commonly used to measure species richness. However, species richness increases with sample size. The smallest sample size may be 1 km and the largest may be the entire region or country.

Detailed explanation-5: -For one thing, the simple act of counting species is more complicated than you might think. Estimates of the total number of species on the planet fluctuate wildly, from 3 million to 100 million, with the most precise measurements to date hovering at around 8.7 million. Most of these are as-yet-undescribed by science.