The species though insignificant in number determines the existence of many other species in a given ecosystem
Extinct species
Endemic species
keystone species
Sacred secies

Question

The species though insignificant in number determines the existence of many other species in a given ecosystemExtinct speciesEndemic specieskeystone speciesSacred secies

Toppr Admin · Accepted Answer

A keystone species is a plant or animal that plays a unique and crucial role in the way an ecosystem function. Without keystone species, the ecosystem would be dramatically different or cease to exist altogether. Some keystone species, such as the wolf, are also apex predators. Keystone species have a disproportionately large effect on the communities in which it occurs. Such species help to maintain local biodiversity within a community either by controlling populations of other species that would otherwise dominate the community or by providing critical resources for a wide range of species.

So, the correct answer is 'keystone species'.

	Column I		Column II
(a)	Endemic species	(i)	Species that exist in very small number
(b)	Endangered species	(ii)	Species found exclusively in a particular area
(c)	Vulnerable species	(iii)	Species that are likely to become endangered
(d)	Rare species	(iv)	Species that are likely to get extinct in the near future