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Which of the following are not the major cause of biodiversity loss in a geographical region?
- a)Habitat loss and fragmentation
- b)Over-exploitation
- c)Lack of rainfall
- d)Co-extinctions
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Which of the following are not the major cause of biodiversity loss in...
Concept:
- The variety of plant and animal life in the world or in a particular habitat is called biodiversity.
- Biodiversity is the term popularised by sociobiologist Edward Wilson to describe the combined diversity at all the levels of biological organization.
Explanation:
- Biodiversity and its conservation are now vital environmental issues of international concern.
- Biodiversity is not only essential for ecosystem health but imperative for the very survival of the human race on this planet.
- The accelerated rates of species extinctions that the world is facing now are largely due to human activities.
- Theloss of biodiversity in a region may lead to a decline in plant production,lowered resistancetoenvironmental perturbations such as drought,andincreased variability in certain ecosystemprocesses such asplant productivity, water use, and pest and disease cycles.
- There are four major causes:
- Habitat loss and fragmentation
- Alien species invasions
- Over-exploitation:
- Co-extinctions
- Habitat loss and fragmentation:This is the most important cause of driving animals and plants to extinction.
- When large habitats are broken up into small fragmentsdue to varioushuman activities,mammals and birdsrequiring large territories, and certainanimals with migratory habitsare badly affected,leading to population declines.
- When
- Over-exploitation: Humans have alwaysdepended on nature for food and shelter, but when‘need’ turns to ‘greed’, it leads toover-exploitation of natural resources.
- Alien species invasions: When alien species are introducedunintentionally or deliberatelyfor whatever purpose, some of them turninvasive, and cause the decline or extinction of indigenous species.
- Co-extinctions: When a species becomes extinct, the plant and animal species associated with it in anobligatory wayalso become extinct.
Thus, lack of rainfall is not the major cause of biodiversity losses in a geographical region.
Additional Information
- The most dramatic examples of habitat loss come from tropical rainforests.
- Once covering more than 14 percent of the earth’s land surface, these rain forests now cover no more than 6 percent.
- Humans have always depended on nature for food and shelter, but when ‘need’ turns to ‘greed’.
- It leads to the exploitation of natural resources.
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Which of the following are not the major cause of biodiversity loss in a geographical region?a)Habitat loss and fragmentationb)Over-exploitationc)Lack of rainfalld)Co-extinctionsCorrect answer is option 'C'. Can you explain this answer?
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