Advertisements
Advertisements
प्रश्न
Explain the concept of "co-extinction" by taking two examples.
What is co-extinction? Explain with a suitable example?
Advertisements
उत्तर
When a species becomes extinct, the plant and animal species associated with it, in an obligatory way, also become extinct, e.g., when a host fish species becomes extinct, its parasites also vanish. This is called co-extinction. Some other examples of co-extinction are, plant-pollinator mutualism where the extinction of one leads to the extinction of the other and monophagous insect that feeds on particular plant species becomes extinct due to extinction of that plant species.
APPEARS IN
संबंधित प्रश्न
Dodo bird, stellar sea cow and passenger pigeon are few examples of extinction due to ______.
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 |
Acronym for IUCN is ____________.
Species that possess a high risk of extinction with very few surviving members (50) are categorised as ____________ by the IUCN.
The Red List of threatened species is published by ______.
Which among the following is a TRUE statement?
What are the major factors that are responsible for the loss of biodiversity? What steps are needed to prevent them?
Match the following columns.
| Column - I | Column - II |
| (i) Dodo | (a) Africa |
| (ii) Ouagga | (b) Russia |
| (iii) Thylacine | (c) Mauritius |
| (iv) Stellar's sea cow | (d) Australia |
Choose the correct match from the following
The extinction of passenger pigeon was due to ______.
Which of the following statements is correct?
What could have triggered mass extinctions of species in the past?
What does 'Red' indicate in the IUCN Red list (2004)?
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.
Enlist two criteria that are used to identify a region for maximum protection as 'Biodiversity hotspots'.
When a species goes extinct in one area, it is often desirable to re-introduce the species from other populations. A major problem with this approach is that ______.
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?
Red Data Book is maintained by ______.
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 ______.
Which one of the following is NOT one of the 'Evil Quartet' responsible for the loss of biodiversity?
