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प्रश्न
Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?
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उत्तर
When alien species are introduced unintentionally or deliberately for whatever purpose, some of them turn invasive and cause the decline or extinction of indigenous species. Invasive weed species like carrot grass, lantana and hyacinth (Eicchornia) have become a threat to the environment and other native species. Similarly, the recent illegal introduction of the African catfish Clarias gariepinus for aquaculture purposes is threatening the indigenous catfishes in our rivers. We have to deliberately extinct these harmful species. Similarly, we aim to make the world polio-free by eradicating various viruses, including the polio virus.
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संबंधित प्रश्न
What are the major causes of species losses in a geographical region?
Substantiate with the help of one example that in an ecosystem mutualists
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.
Enlist any six categories into which a given species is placed once it has been thoroughly evaluated by IUCN.
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 |
The Red List of threatened species is published by ______.
Currently, ______ mass extinction is considered to be the progressing at an alarming rate due to the loss of biodiversity.
Which among the following is an in situ conservation method for national genetic resources?
Threatened species are those which ______.
What do you understand by ‘exotic species’?
The extinction of passenger pigeon was due to ______.
Which of the following is/are endangered plant species?
IUCN means
Match the animals given in column I with their location in column II:
| Column I | Column II |
| A. Dodo | i. Africa |
| B. Quagga | ii. Russia |
| C. Thylacine | iii. Mauritius |
| D. Stellar's sea cow | iv. Australia |
Choose the correct match from the following:
What is common to the following plants: Nepenthes, Psilotum, Rauwolfia and Aconitum?
What does 'Red' indicate in the IUCN Red list (2004)?
What criteria should one use in categorizing a species as threatened?
Explain the concept of "co-extinction" by taking two examples.
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.
"Forests provide intangible benefits to us." Explain by taking three different areas, how.
Gametes of threatened species can be preserved in viable and fertile conditions for long periods using ______.
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.
Many species like Stellar's Sea cow and passenger pigeon have been driven to the brink of extinction. Which of the following describes this situation?
What is ex-situ conservation?
The IUCN Red Data List (2004) in the last 500 years documents the extinction of nearly 784 species including ______.
The sixth extinction in progress currently is different from all previous extinctions on earth as it is ______.
Give definitions of Extinct species.
Give definitions of Endangered species.
