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प्रश्न
What are the major causes of species losses in a geographical region?
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उत्तर
The major causes of species losses (also known as ‘The Evil Quartet’) are as follows:
- Habitat Loss and Fragmentation: Destruction of natural homes due to human activities (e.g., cutting forests).
- Over-exploitation: When human need turns into greed, leading to over-use of resources.
- Alien species invasions: Introduction of non-native species that threaten local species.
- Co-extinctions: Extinction of a species leading to the extinction of other species dependent on it.
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संबंधित प्रश्न
Answer the following question:
Substantiate with the help of one example that in an ecosystem mutualists
(i) tend to co-evolve and
(ii) are also one of the major causes of biodiversity loss.
Dodo bird, stellar sea cow and passenger pigeon are few examples of extinction due to ______.
With the help of any one example explain Alien species invasion as one of the causes of Biodiversity losses.
Match the following and choose the correct alternative.
| Column I | Column II | ||
| i. | Not evaluated | a. | Pervasive and abundant after careful assessment |
| ii. | Near threatened | b. | Information related to risk of extinction is lacking in some way |
| iii. | Least concern | c. | Described by scientist but not assessed by the IUCN |
| iv. | Data deficient | d. | May meet the criteria for threatened status in the near future |
Which among the following is a TRUE statement?
Accroding to IUCN Red list, the status of Antilope is ____________.
Which one of the following is a natural cause of extinction of flora and fauna?
Threatened species are those which ______.
Which of the following is not a cause for loss of biodiversity?
The extinction of passenger pigeon was due to ______.
Which among the following forests is known as the "lungs of the planet earth"?
Which of the following are major causes of species losses in a geographical region?
Which of these is NOT amongst the effects of loss of biodiversity?
What is common to the species shown in figures A and B?
 |
 |
| A | B |
Of the four major causes for the loss of biodiversity (Alien species invasion, habitat loss and fragmentation, over-exploitation and co-extinctions which according to you is the major cause for the loss of biodiversity? Give reasons in support.
There was a loss of biodiversity in the ecosystem due to a new construction project in that area. What would be its impact on the ecosystem? State any three.
The species placed in CR category is ______.
Which of the following suits hotspots in ecological terminology?
Gametes of threatened species can be preserved in viable and fertile conditions for long periods using ______.
Western Ghats have a large number of plant and animal species that are not found anywhere else. Which of the following terms will you use to notify such species?
Consider the following statements:
- Statement I: Endemism and accelerated habitat loss are characteristics of biodiversity hotspots.
- Statement II: Gene bank is an in-situ method of biodiversity conservation.
Choose the correct answer from the options given below.
Which one of the following groups faces maximum threat of extinction?
The sixth extinction in progress currently is different from all previous extinctions on earth as it is ______.
Give definitions of Extinct species.
Write any three criteria on which different types of reflexes are based.
What are the reasons for loss of biodiversity?
Match List - I with List - IІ.
| List - I | List - II |
| A. The Evil Quartet | I. Cryopreservation |
| B. Ex-situ conservation | ΙI. Alien species invasion |
| C. Lantana camara | III. Causes of biodiversity losses |
| D. Dodo | IV. Extinction |
Choose the option with all correct matches.
Which of the following is NOT one of the four causes grouped as the 'Evil Quartet'?
Which of the following animals is correctly categorised as 'Vulnerable' under the IUCN Red List?
Reduced biodiversity in an ecosystem leads to which of the following ecological effects?
