Ch 13Biodiversity and its Conservation — Class 12 Biology, concept-first.

Biodiversity, short for biological diversity, refers to the enormous variety of life found on Earth -- the full range of living organisms, the genetic variation carried within them, and the ecological…

Beyond simply cataloguing how much biodiversity exists, ecologists have identified several broad, recurring patterns in how biodiversity is distributed across the planet -- patterns consistent enough,…

Conserving biodiversity is frequently justified on several distinct kinds of grounds, and understanding these different arguments -- rather than assuming there is only one reason biodiversity matters…

Alongside the immense value biodiversity provides, it is also being lost at a rate that conservation biologists consider alarming, and, unlike the five great mass extinction events recorded in Earth's…

Extinction is the permanent disappearance of a species, so that not a single living individual of it remains anywhere on Earth.

The Red Data Book is a published compilation that documents, species by species, the current conservation status of threatened plants and animals, drawing directly on the IUCN Red List threat categori…

Because biodiversity is not distributed evenly across the planet, and because conservation resources are always limited relative to the scale of the challenge, ecologists have developed the concept of…

India's exceptional overall biodiversity, discussed in the previous sections, exists alongside a correspondingly large and growing list of species now classified as threatened, reflecting the same pre…

Given the scale and variety of threats to biodiversity described earlier in this chapter, conservation efforts are organised around two broad strategies, distinguished by where the protection actually…

Biosphere reserves are a distinct and, in an important respect, more sophisticated model of in-situ conservation than a straightforward National Park or Wildlife Sanctuary, because they are deliberate…

Ex-situ conservation is the strategy of protecting a threatened species outside its natural habitat, in a controlled setting specifically established and managed for that purpose.

Wetlands -- ecosystems such as marshes, mangroves, lakes and floodplains where the land is either permanently or seasonally saturated with water -- are among the most ecologically productive and, at t…

Sample papers and previous-year board questions for this subject.