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……… covers more than 70% of the earth's ...

……… covers more than `70%` of the earth's surface.

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Assertion: Oceans are a low productivity ecosystems despite occupying about 70% of the earth surface. Reason: In aquatic ecosystems, productivity is limited by light which decreases with increasing water depth.

Which of the following statements regarding the estimates of number of species found on earth is not correct ? (a) Total number of species present on earth are considered to be about 7 million as estimated by Robert May. (b) Plants constitute more than 70% of all the species recorded, whereas animals constitute less than 22% of the total number of species. (c) Insects constitute more than 70% of all the animal species. (d) None of these

Knowledge Check

  • A body of 10 kg is dropped from infinite height towards earth's surface. What will be its velocity just before touching the earth's surface. (Gravitational potential energy of the body at earth's surface is 6.25xx10^(8) Joule).

    A
    22.4 km/sec
    B
    11.2 km/sec
    C
    6.4 km/sec
    D
    Infinite

  • If there was no carbondioxide in Earth's atmosphere , the temperature of the Earth's surface would be :

    A
    same as present
    B
    less than the present
    C
    more than the present
    D
    dependent on the amount of oxygen in the atmosphere

  • A body of mass m is taken from the Earth's surface to a height equal to the radius R of the earth. If g is the acceleration to gravity at the surface of the Earth, then find the change in the potential energy of the body .......

    A
    `1/4mgR`
    B
    `1/2`mgR
    C
    mgR
    D
    2mgR

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