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प्रश्न
What do you understand by ‘exotic species’?
उत्तर
Species which are not the natural inhabitants of the local habitat but are introduced into the system are called exotic species. There are many examples when a natural biotic community of the ecosystem suffered extensive damage because of the introduction of exotic species. During the last few decades, some animals like tigers, elephants, rhinoceros, crocodiles, minks, and birds were hunted mercilessly by poachers for their horn, tusks, hides, etc. It has resulted in the rendering of certain types of organisms as endangered category.
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संबंधित प्रश्न
Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?
Dodo bird, stellar sea cow and passenger pigeon are few examples of extinction due to ______.
Species that possess a very high risk of extinction due to rapid population decline of about 50 - 70 % over three generations is designated as ______.
Species that possess a very high risk of extinction due to population decline of about 30 - 50 % over past 10 years are categorized as _______.
Which among the following is/are the type( s) of extinction of species?
Which among the following is an in situ conservation method for national genetic resources?
Which one of the following is a natural cause of extinction of flora and fauna?
Threatened species are those which ______.
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
Which of the following is/are endangered plant species?
Which of the following are major causes of species losses in a geographical region?
What is common to the following plants: Nepenthes, Psilotum, Rauwolfia and Aconitum?
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.
Explain the concept of "co-extinction" by taking two examples.
How can you, as an individual, prevent the loss of biodiversity?
Enlist two criteria that are used to identify a region for maximum protection as 'Biodiversity hotspots'.
Name any two biodiversity hot spots in India.
"Forests provide intangible benefits to us." Explain by taking three different areas, how.
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?
Match the species in Column I with its category in Column II.
| Column I | Column II |
| A. Rare species | I. No species |
| B. Vulnerable species | II. Facing a high risk of extinction |
| C. Endangered species | III. Localised species |
| D. Extinct species | IV. Species under threat |
Choose the correct answer from the options given below.
What is ex-situ conservation?
Red Data Book is maintained by ______.
Write any three criteria on which different types of reflexes are based.
What are the reasons for loss of biodiversity?
