Tag: selection and evolution

Questions Related to selection and evolution

When did the first mass extinctions occur

zoology selection and evolution extinction extinctions environmental science

  1. Devonian-silurian

  2. Permian-triassic

  3. Jurassic

  4. Jurassic-cretaceous.

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Correct Option: B

Precambrian includes

zoology selection and evolution extinction extinctions environmental science

  1. Silurian and ordovician

  2. Carboniferous and permian

  3. Jurassic and triassic

  4. Proterozoic and archaean.

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Correct Option: D

Percentage of then living species which became extinct during permian-triassic period is

zoology selection and evolution extinction extinctions environmental science

  1. 56%

  2. 78%

  3. 87%

  4. 96%.

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Correct Option: D

Second mass extinction occurred during

zoology selection and evolution extinction extinctions environmental science

  1. Jurassic-cretaceous

  2. Cretaceous-tertiary

  3. Cretaceous-palaeocene

  4. Both B and C.

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Correct Option: D

Which of the following does not hold true for Australopithecus?

zoology selection and evolution extinction extinctions environmental science

  1. Existed 2mya.

  2. Probably lived in East African grasslands.

  3. They hunted with stone weapons

  4. Ate meat.

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Correct Option: D

Which of the following statements is true?

zoology selection and evolution extinction extinctions environmental science

  1. About 99% of all species that have ever lived are now extinct.

  2. About 75% of all species that have ever lived are now extinct.

  3. About 25% of all species that have ever lived are now extinct.

  4. None of the above.

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Correct Option: A
Explanation:

Extinction is the complete demise of a species. It takes place when all individuals of a species die out. Extinction has occurred throughout the history of life on Earth. It is the ultimate fate of all species. It has been estimated that 99.9% of all species that have ever lived on Earth are now extinct. The causes of extinction are many and highly variable. They vary from environmental changes brought about by events such as floods, volcanic eruptions, or meteorite impacts, to fluctuations in sea level or climate, to competition between species.

Among the following which one is not endangered mammal?

zoology selection and evolution extinction extinctions environmental science

  1. Maned Sloth or Red sloth

  2. Musk deer

  3. Blue cow

  4. Indian lion

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Correct Option: D

Fear of extinction of species from tropical forests is

zoology selection and evolution extinction extinctions environmental science

  1. 2-5 species/hr

  2. 2-5 species/day

  3. 2-5 species/week

  4. 2-5 species/month

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Correct Option: A
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. Fear of extinction of species from tropical forests is at the rate of 2-5 species/hr.

So, the correct answer is '2-5 species/hr'.

Choose the correct answers from the alternatives given .
The Galapagos Islands are located near to the

zoology selection and evolution extinction extinctions environmental science

  1. West coast of Africa

  2. West coast of South America

  3. West coast of North America

  4. East coast of Australia

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Correct Option: B
Explanation:

The Galapagos islands are known for their large number of endemic species and were studied by Charles Darwin during the second voyage of HMS Beagle. His observations and collections contributed to the inception of Darwin's theory of evolution by means of natural selection. The islands are located in the eastern Pacific Ocean, near the west coast of South America.

So, the correct option is 'West coast of South America'.

According to IUCN, some of the recent extinctions include
(i) Dodo                     (ii) Quagga
(iii) Indian gazelle     (iv) Thylacine 
(v) Steller's sea cow (vi) Bali- subspecies of tiger 

zoology selection and evolution extinction extinctions environmental science

  1. (i), (ii), (iii) and (iv)

  2. (ii), (iii), (iv) and (vi)

  3. (i), (ii), (iv) and (v)

  4. (iii), (iv), (v) and (vi)

Show answer
Correct Option: C
Explanation:
The IUCN Red List of Threatened Species (also known as the IUCN Red List or Red Data List), founded in 1965, has evolved to become the world's most comprehensive inventory of the global conservation status of biological species. It uses a set of criteria to evaluate the extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world. With its strong scientific base, the IUCN Red List is recognized as the most authoritative guide to the status of biological diversity. A series of Regional Red List are produced by countries or organizations, which assess the risk of extinction to species within a political management unit. The IUCN Red List is set upon precise criteria to evaluate the extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world. The aim is to convey the urgency of conservation issues to the public and policy makers, as well as help the international community to try to reduce species extinction. Species such as Dodo, Quagga, Thylacine and Steller's sea cow are recent extinctions.
So the correct option is '(i), (ii), (iv) and (v)'.