Tag: biodiversity, classification and conservation

Questions Related to biodiversity, classification and conservation

What is the major cause of diminishing wildlife number?

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Cannibalism

  2. Habitat destruction

  3. Falling of trees

  4. Paucity of drinking water

Show answer
Correct Option: B
Explanation:

Habitat loss and fragmentation (habitat destruction) are the most important causes for driving animals and plants to extinction. 

The most dramatic examples of habitat loss come from tropical rainforests. Once covering more than 14 percent of the Earth's land surface, these rainforests now cover no more than 6 percent. They are being destroyed fast. Besides the total loss, the degradation of many habitats by pollution also threatens the survival of many species. When large habitats are broken up into small fragments due to various human activities, mammals and birds requiring large territories and certain animals with migratory habits are badly affected, leading to population declines.

What is mainly responsible for extinction of wildlife?

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Hunting for flesh

  2. Destruction of habitats

  3. Pollution of air and water

  4. All the above

Show answer
Correct Option: D
Explanation:

Hunting for flesh & skin, destruction of habitats by deforestation & polluted air & water leads to extinction of wildlife.

So, the correct answer is 'All the above'

Wildlife is destroyed most when

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. There is lack of proper care

  2. Mass scale hunting for foreign trade

  3. Its natural habitat is destroyed

  4. Natural calamity

Show answer
Correct Option: C
Explanation:

When there are no more individuals of a species (plant or animal) alive anywhere in the world, the species is said to be extinct. Extinction is also known as the process of dying out. The process is a completely natural part of evolution. But sometimes extinctions happen at a higher and a faster rate than usual. Factors such as large body size, small population, massive habitat loss and position at a higher trophic level favor extinction

So, the correct answer is 'Its natural habitat is destroyed'

One of the chief reasons among the following for the depletion in the number of species making it endangered is

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Greenhouse effect

  2. Habitat destruction

  3. Overhunting and poaching

  4. Competition and predation

Show answer
Correct Option: B
Explanation:
Jarod Diamond in 1984 listed four chief mechanisms for the loss of biodiversity. It was known as the 'Evil quartet'. It was also known as ‘four horsemen of the ecological apocalypse. The four mechanisms were:-
a) overhunting (or overexploitation),
b) introduced species,
c) habitat destruction and
d) chains of linked extinctions (trophic cascades, or co-extinctions).
So, the correct answer is 'Habitat destruction'.

Which of the following is correctly matched?

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Stratification- Population

  2. Aerenchyma- Opuntia

  3. Age pyramid- Biome

  4. Parthenium- Threat to biodiversity

Show answer
Correct Option: D
Explanation:

Parthenium or carrot grass is an alien species. When alien species are introduced unintentionally or deliberately for whatever purpose, some of them turn invasive and cause decline or extinction of indigenous species. Such species are also called exotic or introduced species. Thus, Parthenium is a threat to biodiversity as it competes with our local species for the limited resources. So, the correct answer is 'Parthenium- Threat to biodiversity'.

Number of wild life is continuously decreasing.What is the main reason of this : -

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Predation

  2. Cutting down of forest

  3. Destruction of habitat

  4. Hunting

Show answer
Correct Option: C
Explanation:
Wildlife refers to all living organisms (terrestrial, aquatic and aerial) living in all possible natural habitats of their own, other than the cultivated plants and domesticated animals. Thus 'wildlife' does not exist only in jungles and are hunted down but wildlife includes even the migrating birds, turtles, coral reefs, microorganisms, insects, fishes, etc. Several hundred organisms are endangered or on the verge of extinction. The reasons are deforestation, pollution, killing, overexploitation etc. The most important among them is deforestation or destruction of their natural habitat because it will affect the species (flora and fauna) of the complete area and not only a few organisms. The natural habitat may be destroyed by man for his settlements, grazing grounds, agriculture, mining, industries, dam building, etc. As a consequence of this, the species must adapt to the changes, move elsewhere or may succumb to predation, starvation or disease, and eventually dies.

So, the correct answer is 'Destruction of habitat'.

Wildlife population are decreasing due to _________

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Afforestation

  2. Loss of minerals

  3. Poaching

  4. Loss of sunlight

Show answer
Correct Option: C
Explanation:
  • Poaching has been defined as illegal hunting or capturing of wild animals, usually associated with land use rights. 
  • According to Encyclopædia Britannica, poaching was performed by impoverished peasants for subsistence purposes and a supplement for meagre diets.
  •  Hence, Wildlife population are decreasing due to Poaching.
  • So, the correct answer is 'Poaching'.

The extinction and disappearance of some species is because of the _____

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Destruction of habitats

  2. Planting of trees

  3. Preservation of forest

  4. Prevention of overgrazing

Show answer
Correct Option: A
Explanation:

The extinction and disappearance of some species from planet take place due to the destruction of their natural habitat, poaching and killing habits. Whereas, planting of more trees (afforestation), preservation of forests and prevention of overgrazing causes conservation of natural habitat thereby saving the species from extinction.

So, the correct answer is 'Destruction of habitats'.

The main reason for extinction of species is

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Hunting

  2. Destruction of habitat

  3. Pollution

  4. None of the above

Show answer
Correct Option: B
Explanation:

Habitat destruction is the process in which the organisms that previously used the site are displaced or destroyed, reducing biodiversity. Habitat destruction is the greatest contributor to the extinction of many species. This destruction is ongoing in both terrestrial and aquatic biomes, with approximately 80% of all extinctions being attributed to human caused habitat destruction. Terrestrially the destruction includes forests, deserts and grasslands, but the latter may account for the greatest losses due to the agricultural and urban conversion.

Which one of the following may be the reason for extinction of plant species due to human activities?

zoology biodiversity, classification and conservation biodiversity losses biodiversity loss and need for conservation environmental conservation and biodiversity

  1. Earthquakes

  2. Pollution

  3. Diseases

  4. Evolution

Show answer
Correct Option: B
Explanation:

Extinction is the end of an organism or of a group of organisms, normally a species. Humans cause extinction of a species through over harvesting, pollution, habitat destruction, invasion of invasive species, over hunting and other influences. Although, earthquakes and diseases are the results of human activities but it does not cause any extinction of plant species. 

Therefore, the correct answer is option B.