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प्रश्न
What criteria should one use in categorizing a species as threatened?
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उत्तर
The criteria that should be used in categorising a specials as threatened are
- Number of the members of the species is declining at an alarming rate.
- Their habitat is being modified or destroyed.
- Predator or poacher activities are increasing.
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संबंधित प्रश्न
What are the major causes of species losses in a geographical region?
Species that possess a high risk of extinction with very few surviving members (50) are categorised as ____________ by the IUCN.
Which among the following is an exception to invasive species?
What do you understand by ‘exotic species’?
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
What is common to lantana Eichhomia and African catfish?
Which of these is NOT amongst the effects of loss of biodiversity?
What does 'Red' indicate in the IUCN Red list (2004)?
What is common to the species shown in figures A and B?
 |
 |
| A | B |
Explain the concept of "co-extinction" by taking two examples.
Enlist two criteria that are used to identify a region for maximum protection as 'Biodiversity hotspots'.
Which of the following suits hotspots in ecological terminology?
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.
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?
Which of the following regions of the globe exhibits highest species diversity?
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 Endangered species.
What are the reasons for loss of biodiversity?
