Home
Class 12
BIOLOGY
Assertion : Biodiversity hotspots are th...

Assertion : Biodiversity hotspots are the regions which possess high levels of species richness, high degree of endemism and no loss habitats.
Reason : Total number of biodiversity hotspots in the world is 32 with two of these hotspots found in India.
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c) If assertion is true but reason is false.
(d) If both assertion and reason are false.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
Biodiversity hotspots are the regions characterised by very high levels of species richness, high degree of endemism and are also the regions of accelerated habitat loss. Initially 25 biodiversity hotspot were identified but subsequently nine more have been added to the list, bringing the total number of biodiversity hotspots in the world to 34. Three of these hotspots, i.e., Western Ghats-Sri Lanka, Indo-Burma and Himalayas-cover our country's exceptionally high biodiversity regions.
Doubtnut Promotions Banner Mobile Dark
|

Similar Questions

Explore conceptually related problems

Write note:Biodiversity hotspots

Write a note on biodiversity hotspot.

Assertion : Jim Corbett National Park is the first National Park of India and is famous for tigers. Reason : Through the main focus is protection of wildlife, the reserve management has also encouraged ecotourism in this national park. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Assertion : Offsite collections can be used to restock depleted populations, reintroduce species in the wild and restore degraded habitats. Reason : In situ conservation refers to the conservation of endangered species in their natural habitats. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Assertion : Broadly utilitarian arguments say that we should conserve biodiversity because biodiversity plays a major role in many ecosystem services that nature provides. Reason : Expolration of molecular, genetic and species level diversity to obtain the products of economic importance is include under broadly utilitarian category. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Assertion : Over-exploitation of a species reduces the size of its population eventually leading to its extinction. Reason : Steller's sea cow is a large, herbivorous, terrestrial mammal which is on the verge of extinction due to over exploitation. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Assertion : One of the most important traditional uses of sacred groves was that they acted as a repository for various ayurvediv medicines. Reason : In modern times , sacred groves have become biodiversity rich areas, as they provide refuge to various plant and animal species of conservation significance. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Assertion : Critically endangered category includes the species which have sufficient populationa at present but is undergoing depletion due to some factors. Reason : Vulnerable category includes the species which are facing very high risk of extinction in the wild an can become extinct any moment. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Assertion : The Nile perch introduced into lake Victoria in east Africa led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the lake. Reason : When alien species are introduced deliberately for economic or other uses, they often become invasive and cause extinction of indigenous species. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Assertion : In a wildlife sanctuary, collection of timber, harvesting of minor forest products and private ownership rights are allowed. Reason : A sanctuary is a protected area meant for the conservation of both flora and fauna where cultivation of land is permitted. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Home
Profile