Chapter 20: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 20
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MCQ 21: The most dangerous disease of respiratory system is
MCQ 22: The contraction of bronchi causes
MCQ 23: The scientific name for flu is
MCQ 24: 'Nicotine' is a drug which causes
MCQ 25: The respiration that involves the presence of oxygen is known as
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