Class 7 Science - ICSE-BIOLOGY
Respiration
The chapter 'Respiration' in Class 7 ICSE Biology explores how living organisms release energy from food to sustain life. Students learn about the fundamental difference between breathing and cellular respiration, the types of respiration (aerobic and anaerobic), and the detailed respiratory systems of humans, animals like earthworms and fish, and plants. Understanding this chapter is crucial for board exam success as it frequently features conceptual questions, diagrams of the human respiratory system, and comparative questions between breathing and respiration, carrying significant weight in the final biology assessments.
Start Learning FreeKey Concepts
Cellular Respiration
The process by which living cells break down glucose in the presence or absence of oxygen to release energy in the form of ATP.
Aerobic vs Anaerobic Respiration
Aerobic respiration requires oxygen and produces carbon dioxide, water, and lots of energy, whereas anaerobic respiration takes place without oxygen, producing less energy and byproducts like lactic acid or alcohol.
Breathing Mechanism in Humans
The physical process of inhaling oxygen-rich air and exhaling carbon dioxide-rich air, driven by the movement of the diaphragm and rib muscles.
Respiration in Plants
Plants take in oxygen and release carbon dioxide day and night through tiny pores called stomata on leaves and lenticels on stems.
Respiratory Organs in Animals
Different animals have specialized organs for gas exchange, such as skin in earthworms, gills in fish, trachea in insects, and lungs in mammals.
Important Formulas
Board Exam Info
In ICSE Biology Class 7, this chapter typically carries around 8 to 12 marks. Common question types include labeling diagrams of the human respiratory system, differentiating between aerobic and anaerobic respiration, explaining breathing mechanisms, and short conceptual reasons.
Frequently Asked Questions
What is the difference between breathing and respiration?
Breathing is a physical process of taking in oxygen and giving out carbon dioxide, while respiration is a chemical process inside cells that breaks down food to release energy.
Why do our muscles cramp after heavy exercise?
During heavy exercise, lack of oxygen causes muscle cells to respire anaerobically, producing lactic acid which builds up and causes painful cramps.
Do plants respire only at night?
No, plants respire 24 hours a day, taking in oxygen and releasing carbon dioxide, but during the day photosynthesis masks this because they take in more carbon dioxide than they produce.
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