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Inspiratory Reserve Volume (IRV) is the additional amount of air a person can inhale after a normal inspiration.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Inspiratory Capacity (IC) includes Tidal Volume (TV) and Inspiratory Reserve Volume (IRV), representing the maximum volume of air a person can inspire after a normal expiration.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Inspiratory Capacity (IC) is the total volume of air a person can inspire after a normal expiration (TV + IRV).
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Mechanism of Breathing and Respiratory Volumes
Correct option is B, Extra air inhaled after normal inspiration. In Lung Volumes, Capacities and Regulation, the accurate description is Extra air inhaled after normal inspiration, and that is what you should commit to memory. Keep the definition tight and the role clear — this is mainly a definition check, and Extra air inhaled after normal inspiration is the standard term or meaning used in Lung Volumes, Capacities and Regulation. Then Extra air inhaled after normal inspiration is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.
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