9th Class Science Natural resources

  • question_answer 46)
      Oxygen is returned to the atmosphere mainly by (a) burning of fossil fuel        (b) respiration           (c) photosynthesis                 (d) fungi

    Answer:

      (a) Burning of fossil fuels results in the emission of  in the atmosphere. Respiration is involved in water cycle whereas phooey thesis is the process by which plants make their food in the presence of  and sunlight, thus oxygen in the atmosphere.


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