Class 9 biology Practice Tests
Class 9 Biology Online Tests
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MCQ 1: If the nitrogen is the main element of fertilizers then the fertilizers are classified as
MCQ 2: The increased ratio of chemical nutrients in the ecosystem is classified as
MCQ 3: The excess of nitrogen fertilizers leads to
MCQ 4: The greenhouse gas which can be emitted from the storage of nitrogen-based fertilizers is
MCQ 5: The organic fertilizers can be derived from
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