Respiration in Organisms – Class 7 Science
Respiration is one of the most important life processes. All living organisms need energy to grow, move, repair tissues, and perform daily activities. This energy is released from food through the process of respiration.
What is Respiration?
Respiration is the process by which living organisms break down food in the presence or absence of oxygen to release energy. The energy released is used for various life activities.
Equation of Respiration:
Glucose + Oxygen → Carbon Dioxide + Water + Energy
Difference Between Breathing and Respiration
| Breathing | Respiration |
|---|---|
| Physical process | Chemical process |
| Involves inhaling and exhaling air | Involves breakdown of food |
| Occurs in respiratory organs | Occurs inside cells |
Types of Respiration
1. Aerobic Respiration
Aerobic respiration takes place in the presence of oxygen. It releases a large amount of energy.
- Occurs in most plants and animals
- Produces carbon dioxide and water
- More efficient process
2. Anaerobic Respiration
Anaerobic respiration occurs in the absence of oxygen. It releases less energy.
- Occurs in yeast and some bacteria
- Produces alcohol or lactic acid
- Less efficient
Respiration in Humans
Humans breathe through lungs. The air enters through the nose, passes into the lungs, and oxygen is absorbed into the blood. Carbon dioxide is released during exhalation.
Steps involved:
- Inhalation of oxygen
- Transport of oxygen by blood
- Release of energy in cells
- Exhalation of carbon dioxide
Respiration in Other Animals
- Fish: Gills
- Insects: Spiracles
- Earthworms: Skin
- Frogs: Skin and lungs
Respiration in Plants
Plants respire through small openings called stomata. Oxygen enters the plant and carbon dioxide is released. Respiration occurs all the time, even at night.
Importance of Respiration
- Provides energy for life processes
- Helps in growth and repair
- Maintains body temperature
- Essential for survival
Key Points to Remember
- Respiration is essential for life
- Breathing and respiration are different
- Energy is released during respiration
- All living organisms respire
📘 Class 7 Science – Respiration in Organisms
Easy Notes | Exam Oriented | Student Friendly
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