Tag: environmental science

Questions Related to environmental science

India has a long coastline of :

zoology selection and evolution extinction extinctions environmental science

  1. 4000 km

  2. 5500 km

  3. 6500 km

  4. 7500 km

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Correct Option: D

During cretaceous-palaeocene mass extinction the organisms that became extinct were

zoology selection and evolution extinction extinctions environmental science

  1. Mammoth

  2. Dinosaurs

  3. Trilobites

  4. Marine amphibians.

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Correct Option: B

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'.