Life Processes Class 10 Biology – NCERT Notes, Diagrams & Board Solutions
Comprehensive Class 10 Biology Life Processes guide: Photosynthesis equations, Human digestive system, Heart double circulation, Nephron excretion, and Board Q&A.
Life Processes – Complete Revision & Board Solutions
All living organisms perform vital physiological maintenance functions called life processes. These include Nutrition, Respiration, Transportation, and Excretion.
Autotrophic Nutrition & Photosynthesis
Aerobic vs Anaerobic Respiration
| Parameter | Aerobic Respiration | Anaerobic Respiration |
|---|---|---|
| Oxygen Requirement | Occurs in the presence of O₂ | Occurs in the absence of O₂ |
| Site of Occurrence | Cytoplasm and Mitochondria | Cytoplasm only |
| End Products | CO₂ + H₂O + Energy | Ethanol + CO₂ (in Yeast) OR Lactic acid (in Muscle cells) |
| Energy Output | High: 38 ATP per glucose | Low: 2 ATP per glucose |
What is double circulation? Why is it necessary in human beings?
Definition: Double circulation is a circulatory mechanism in which blood passes through the heart twice during each complete circuit of the body:
- Pulmonary Circulation: Deoxygenated blood is pumped from the right ventricle to the lungs for oxygenation and returns oxygenated to the left atrium.
- Systemic Circulation: Oxygenated blood is pumped from the left ventricle to all body tissues and organs, and returns deoxygenated to the right atrium.
Necessity: Humans are warm-blooded (endothermic) organisms requiring high amounts of continuous energy to maintain constant body temperature. Separation of oxygenated and deoxygenated blood ensures highly efficient oxygen supply to cells and prevents mixing.
Indexed Topics & Examination Keywords
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