andldquo;The species that are not found after searches of known or likely areas where they may occurandrdquo; are known as:a)Normal speciesb)Vulnerable speciesc)Extinct speciesd)Rare speciesCorrect answer is option 'C'. Can you explain this answer?

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“The species that are not found after searches of known or likely areas where they may occur” are known as:

a)
Normal species
b)
Vulnerable species
c)
Extinct species
d)
Rare species

Correct answer is option 'C'. Can you explain this answer?

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“The species that are not found after searches of known or likel...

Extinct Species: Furthermore, there are some extinct species. This includes species which are not found after searches of known or likely areas where they may occur. For example, the Asiatic cheetah, pink head duck etc.

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What is the name given to the species which are not found after searches of known or likely areas where they may occur

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PassageIInvasions of exotic species into new geographical areas sometimes occur naturally without human agency. However, human actions have increased this trickle to a flood. Human caused introductions may occur either accidently or as a consequence of human transport, or intentionally but illegally to serve some private purpose or legitimately to procure some hoped-for public benefit by bringing a pest under control, producing new agricultural products or providing novel recreational opportunities. Many introduced species are assimilated into communities without much obvious effect. However some have been responsible for dramatic changes to native species and native communities. For example, the accidental introduction of the brown tree snake, Boiga irregularis into Guam, an island in the pacific, has through nest predation reduced 10 endemic forest bird species to the point of extinction.One of the major reasons for the worlds great biodiversity is the occurrence of centres of endemism so that similar habitats in different parts of the world are occupied by different groups of species that happen it have evolved there. If the species naturally had access to everywhere on the globe, we might expect a relatively small number of successful species to become dominant in each biome. The extent to which this homogenisation can happen naturally is restricted by the limited powers of dispersal of most species in the face of the physical barriers that exist to dispersal. By virtue of the transport opportunities offered by humans, these barriers have been breached by an ever-increasing number of exotic species.The effects of introductions have been to convert a hugely diverse range of local community compositions into something much more homogenous.It would be wrong, however, to conclude that introducing species to a region will inevitably cause a decline in species richness there. For example, there are numerous species of plants, invertebrates and vertebrates found in continental Europe but absent from the British Isles (many because they have so far failed to recolonize after the last glaciations).Their introduction would be likely to augment British biodiversity. The significant detrimental effect noted above arises where aggressive species provide a novel challenge to endemic biotas ill-equipped to deal with them.Q. How is homogenization prevented under natural conditions?

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Directions for the following 4 (four) items:Read the follouing passage and answer the items that follow. Your answers to these items should be based on the passage only.PassageA species that exertsan influence out of proportion to its abundance in an ecosystem is called a keystone species. The keystone species may influence both the species richness of communities and the flow of energy and materials through ecosystems. The sea star Pisaster the flow of energy and materials through ecosystems. The sea star Pisaster ochraceus, which lives in rocky intertidal ecosystems on the Pacific coast of North America, is also an example of a keystone species. Its preferred prey is the mussel Mytilus californianus . In the absence of sea- stars, these mussels crowd out other competitors in a broad belt of the intertidal zone. By consuming mussels, sea star creates bare spaces that are taken over by a variety of other species. A study at the University of washington demonstrated the influence of Pisaster on species richness by removing sea stars from selected parts of the intertidal zone repeatedly over a period of five years. Two major changes occured in the areas from which sea stars were removed. First, the lower edge of the 46. mussel bed extended farther down into the intertidal zone, showing that sea stars are able to eliminate mussels completely where they are covered with water most of the time. Second, and more dramatically, 28 species of animals and algae disappeared from the sea star removal zone. Eventually only Mytilus, the dominant competitor, occupied the entire substratum. Through its effect on competitive relationships, predation by Pisaster largely determines which species live in these rocky intertidal ecosystems.Q. What is the crux of the passage ?

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The Chiru or the Tibetan antelope is an

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The Gangetic dolphin belongs to which of the following categories of fauna?

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“The species that are not found after searches of known or likely areas where they may occur” are known as:a)Normal speciesb)Vulnerable speciesc)Extinct speciesd)Rare speciesCorrect answer is option 'C'. Can you explain this answer?

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