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Which of the following are NOT the direct causes of the extinction of species by humans' intervention?
1. Collection
2. Introduction of invasive species
3. Hunting
Choose from the following options.
  • a)
    1 only
  • b)
    2 only
  • c)
    3 only
  • d)
    All of them
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the following are NOT the direct causes of the extinction of...
Species are threatened with extinction by the intervention of humans due to:
  • Direct causes – such as hunting, collection or capture, and persecution.
  • Indirect causes include habitat loss, modification, fragmentation, and the introduction of invasive species.
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Directions for the following 11 questions:Read the following three passages and solve the items that follow each passage. Your Solutions to these passages should be based on these passages only.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. With reference to the passage, which of the following statements is correct?

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Which of the following are NOT the direct causes of the extinction of species by humans' intervention?1. Collection2. Introduction of invasive species3. HuntingChoose from the following options.a) 1 onlyb) 2 onlyc) 3 onlyd) All of themCorrect answer is option 'B'. Can you explain this answer?
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