Class 7th Science NCERT Chapter 10
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Important Topics to Study:
1. Why Do We Respire?
– All organisms respire to get energy from food through cellular respiration, which can be aerobic or anaerobic.
2. Anaerobic Respiration in Organisms:
– Some organisms and muscle cells can perform anaerobic respiration to meet the immediate energy demands in the absence of sufficient oxygen.
3. Breathing:
– Breathing involves inhaling oxygen-rich air and exhaling carbon dioxide-rich air; it is essential for the continuous supply of oxygen to the body's cells.
4. Mechanism of Breathing:
– The process of breathing involves the movement of the diaphragm and rib cage to facilitate inhalation and exhalation, allowing air to enter and leave the lungs.
Summary:
The chapter discusses the importance of respiration in organisms to obtain energy through cellular respiration, the differences between aerobic and anaerobic respiration, the significance of breathing for the supply of oxygen to cells, and the mechanism of breathing involving the diaphragm and rib cage movements to facilitate air exchange in the lungs7.
Why do organisms require energy from food?
What is the difference between aerobic and anaerobic respiration?
Explain how muscle cells utilize anaerobic respiration during heavy exercise.
Describe the process of breathing including inhalation and exhalation.
Explain the variations in breathing rates during different activities and their relation to energy requirements.
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