Of more immediate concern regarding carbon cycle is

  • A

    Output rate of carbon locked in deposits of coal, petroleum and natural gas

  • B

    Green house gases

  • C

    Increase in the total mass of carbon in earth's atmosphere by $ 12-14\%$

  • D

    All above

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Noosphere relates to an environment dominated by

In ecosystem lithosphere is concerned with

Burning of fossil fuels affects

Phosphorus is the major constituent of

$I.$ biological membranes

$II. $ nucleic acids

$III.$ cellular energy

Choose the correct option

Halophytes are