Tag: extinctions

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Questions Related to extinctions

Multiple choice zoology selection and evolution extinction extinctions environmental science

When did the first mass extinctions occur

  1. Devonian-silurian

  2. Permian-triassic

  3. Jurassic

  4. Jurassic-cretaceous.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The 'Big Five' mass extinctions include the Ordovician-Silurian, Late Devonian, Permian-Triassic, Triassic-Jurassic, and Cretaceous-Paleogene. The Permian-Triassic is often cited as the most severe.

Multiple choice zoology selection and evolution extinction extinctions environmental science

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

  1. 56%

  2. 78%

  3. 87%

  4. 96%.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Permian-Triassic extinction event, often called the Great Dying, was the most severe extinction event in Earth's history. It resulted in the loss of approximately 96 percent of all marine species and about 70 percent of terrestrial vertebrate species.

Multiple choice zoology selection and evolution extinction extinctions environmental science

Second mass extinction occurred during

  1. Jurassic-cretaceous

  2. Cretaceous-tertiary

  3. Cretaceous-palaeocene

  4. Both B and C.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Cretaceous-Tertiary (K-T) extinction event is widely known as the fifth mass extinction, but historical classifications sometimes grouped the Cretaceous-Palaeocene boundary as synonymous with the K-T boundary. Since both B and C refer to the same geological transition, D is the correct choice.

Multiple choice zoology selection and evolution extinction extinctions environmental science

Which of the following does not hold true for Australopithecus?

  1. Existed 2mya.

  2. Probably lived in East African grasslands.

  3. They hunted with stone weapons

  4. Ate meat.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Australopithecus species were primarily herbivorous, feeding on fruits, leaves, and other plant matter. While they may have occasionally scavenged, they are not characterized as hunters using stone weapons, which is a trait associated with later Homo species.

Multiple choice zoology selection and evolution extinction extinctions environmental science

Which of the following statements is true?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice zoology selection and evolution extinction extinctions environmental science

Fear of extinction of species from tropical forests is

  1. 2-5 species/hr

  2. 2-5 species/day

  3. 2-5 species/week

  4. 2-5 species/month
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.