Tag: zoology

Questions Related to zoology

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.

Which of the following is the main reason for extinction of animals?

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

  1. Predation

  2. Pollution

  3. Destruction of habitat

  4. Felling of trees

Show answer
Correct Option: C
Explanation:

Destruction of habitat is the process in which natural habitat is rendered unable to support the species that lived in it. Increasing urbanization and industrialization has resulted in encroachment of forest areas leading to destruction of habitat. As a result, the natural flora and fauna have been endangered and some have become extinct. Thus the correct answer is option C.

Polar bears are just one species whose biodiversity has been affected by human activities Which of these is the greatest threat to the polar bears? 

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

  1. Melting ice due to global warming

  2. Organic pollutants

  3. Habitat destruction

  4. Human encroachment

  5. Habitat fragmentation

Show answer
Correct Option: A
Explanation:

Polar bears are found in arctic region where the ice caps are present and temperature is quite low. Hence, melting ice due to global warming is the greatest threat to the biodiversity of polar bears.

Anthropogenic extinction means the extinction of species from surface of Earth, that is due to

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

  1. Change in season

  2. Effects of meteors

  3. Human activities

  4. None of the above

Show answer
Correct Option: C
Explanation:
Anthropogenic extinction means the extinction of species from surface of Earth, that is due to human activities.
The Holocene extinction, otherwise referred to as the Sixth extinction or Anthropocene extinction, is a name for the ongoing extinction event of species during the present Holocene epoch (since around 10,000 BCE) mainly due to human activity.

Which of the following is responsible for the extinction of wildlife?

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

  1. Hunting

  2. Destruction of habitats

  3. Pollution of air and water

  4. All of the above

Show answer
Correct Option: D
Explanation:

The important causes of biodiversity losses or species extinctions, that the world is facing now, are largely due to human activities. There are four major causes -
(i) Habitat loss and fragmentation (includes deforestation and pollution).
(ii) Over-exploitation (includes hunting, fishing and other such activities).
(iii) Alien species invasions.
(iv) Co-extinctions.

Thus, the correct answer is option D.

The factor that destroys plant biodiversity is

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

  1. Biosphere reserves

  2. Vulnerable ecosystems

  3. Inaccessibility of habitats

  4. Destruction of habitats

Show answer
Correct Option: D
Explanation:

The factor that destroys plant biodiversity is destruction of habitats, wildlife species get extinct because of destruction of forest by deforestation.

So, the correct answer is 'Destruction of habitats'

Extinction of numerous wild animals is due to

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

  1. Hunting

  2. Deforestation

  3. Overcrowding

  4. Scarcity of food

Show answer
Correct Option: B
Explanation:

Deforestation refers to destruction of forest by extensive cutting of trees, since wild animals live in forests, they lose their habitat which leads to extinction of species

So, the correct answer is 'Deforestation'

Bald Eagle had been at high risk of extinction due to its

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

  1. Large size

  2. Low reproductive potential

  3. High trophic level

  4. Change in migratory route

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, and position at a higher trophic level favour extinction.
So, the correct answer is 'High trophic level'.

Susceptibility to extinction is due to

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

  1. Large body size

  2. Small population

  3. High trophic level

  4. All of the above

Show answer
Correct Option: D
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 and position at a higher trophic level favour extinction.

So, the correct answer is 'All of the above'.