Chapter 14: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 14
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MCQ 21: As compare to water, pesticides and insecticides have
MCQ 22: The water we use comes from
MCQ 23: Pesticides make the river water
MCQ 24: Most of the reservoirs are built on
MCQ 25: As compare to normal water the concentration of oxygen in hot water is
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