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State PSC Physical Geography — practice questions — page 22

Explore 928 free Physical Geography questions in State PSC Geography. Open each question or exercise to read its content, reference answers and available explanation.

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Physical Geography questions and exercises with answers

Showing questions 631–660 of 928.

The best estimate of the number of species on earth is:Read the answer and worked solution →What share of all species that ever lived on earth are extinct today?Read the answer and worked solution →Biodiversity is consistently richer in the:Read the answer and worked solution →Biodiversity is discussed at how many levels?Read the answer and worked solution →Variation of genes within a species is called:Read the answer and worked solution →Areas that are rich in species diversity are called:Read the answer and worked solution →Biodiversity plays which three roles?Read the answer and worked solution →Crop diversity is also called:Read the answer and worked solution →Tropical regions occupy about what share of the world's total area?Read the answer and worked solution →Tropical rain forests contain about what share of the species on earth?Read the answer and worked solution →Species introduced into a habitat that are not its natural inhabitants are called:Read the answer and worked solution →The IUCN classifies threatened species into how many categories?Read the answer and worked solution →The IUCN publishes information on endangered species worldwide as the:Read the answer and worked solution →Species likely to be in danger of extinction in the near future are classed as:Read the answer and worked solution →Species whose world population is very small and confined to limited areas are:Read the answer and worked solution →India signed the Convention of Biodiversity at the Earth Summit in Rio de Janeiro in:Read the answer and worked solution →How many other nations joined India in signing the Convention of Biodiversity?Read the answer and worked solution →The Wild Life (Protection) Act of India was passed in:Read the answer and worked solution →Tropical countries holding a large share of the world's species are called:Read the answer and worked solution →How many mega diversity countries are there?Read the answer and worked solution →In Madagascar, about what share of plants and animals are found nowhere else?Read the answer and worked solution →Catch the mega diversity countriesRead the answer and worked solution →Pop the threat categoriesRead the answer and worked solution →Run the conservation numbersRead the answer and worked solution →Slice the biodiversity wordsRead the answer and worked solution →Threat or protectionRead the answer and worked solution →Sort the diversity levelsRead the answer and worked solution →Type the numberRead the answer and worked solution →Biodiversity bingoRead the answer and worked solution →Kant's Nebular Hypothesis was revised by the mathematician Laplace in which year?Read the answer and worked solution →

Worked practice questions

The best estimate of the number of species on earth is:

  1. 1 billion
  2. 10 million
  3. 2 million
  4. 100 million
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Correct answer: B. 10 million

1. Estimates range from 2 million to 100 million. 2. 10 million is the best estimate. 3. New species are discovered regularly. _Source: syllabus Fundamentals of Physical Geography, Chapter 16, Biodiversity and Conservation._

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What share of all species that ever lived on earth are extinct today?

  1. 99 per cent
  2. 50 per cent
  3. 10 per cent
  4. 75 per cent
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Correct answer: A. 99 per cent

1. A species lasts one to four million years on average. 2. 99 per cent of species ever are extinct. 3. Biodiversity is in constant evolution. _Source: syllabus Fundamentals of Physical Geography, Chapter 16, Biodiversity and Conservation._

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Biodiversity is consistently richer in the:

  1. Tundra
  2. Tropics
  3. Poles
  4. Deserts
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Correct answer: B. Tropics

1. Towards the poles there are fewer species. 2. The tropics are richest. 3. Solar energy and water drive the pattern. _Source: syllabus Fundamentals of Physical Geography, Chapter 16, Biodiversity and Conservation._

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