Advertisements
Advertisements
Question
What are the major causes of species losses in a geographical region?
Advertisements
Solution
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.
RELATED QUESTIONS
Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?
Give any 'two' examples of endangered species
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/are the type( s) of extinction of species?
Which among the following is a TRUE statement?
Which among the following is an exception to invasive species?
'The Evil Quartet' is a concept which describes the ______.
What do you understand by ‘exotic species’?
What are the major factors that are responsible for the loss of biodiversity? What steps are needed to prevent them?
Which of the following is not a cause for loss of biodiversity?
What is common to lantana Eichhomia and African catfish?
Explain as to how protection of biodiversity hot spots alone can reduce up to 30% of the current rate of species extinction.
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.
What criteria should one use in categorizing a species as threatened?
Though the conflict between humans and wildlife started with the evolution of man, the intensity of conflict has increased due to the activities of modern man. Justify your answer with suitable examples.
How many Biodiversity hotspots have been identified around the world?
"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.
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 ______.
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?
These are regarded as major causes of biodiversity loss:
- Over exploitation
- Co-extinction
- Mutation
- Habitat loss and fragmentation
- Migration
Choose the correct option:
Which of the following animals is correctly categorised as 'Vulnerable' under the IUCN Red List?
Which of the following is a natural cause (rather than a human cause) of biodiversity loss?
Over-exploitation as a cause of biodiversity loss is best exemplified by which of the following?
Which of the following sets correctly lists all extinct (EX) species mentioned in the IUCN classification?
