Class- 10 Life processes
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1. Introduction
Life processes are the basic functions performed by living organisms to sustain life.
These include:
Nutrition
Respiration
Transportation
Excretion
These processes are essential for growth, repair, energy production, and survival.
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2. Nutrition
What is Nutrition?
Nutrition is the process by which an organism takes in food and utilizes it for energy, growth, and
repair.
Types of Nutrition:
1. Autotrophic Nutrition:
Organisms make their own food from simple substances.
, Example: Green plants through photosynthesis.
Photosynthesis Equation:
6CO₂ + 6H₂O + sunlight → C₆H₁₂O₆ + 6O₂
2. Heterotrophic Nutrition:
Organisms depend on others for food.
Types:
Holozoic (e.g., Humans)
Saprophytic (e.g., Fungi)
Parasitic (e.g., Tapeworm)
Human Digestive System:
Mouth: Mechanical & chemical digestion (saliva contains amylase).
Esophagus: Food pipe.
Stomach: Acidic environment; proteins begin digestion.
Small Intestine: Main site for digestion and absorption.
Large Intestine: Water absorption; forms feces.
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3. Respiration
What is Respiration?
The process of breaking down food (glucose) to release energy.
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1. Introduction
Life processes are the basic functions performed by living organisms to sustain life.
These include:
Nutrition
Respiration
Transportation
Excretion
These processes are essential for growth, repair, energy production, and survival.
---
2. Nutrition
What is Nutrition?
Nutrition is the process by which an organism takes in food and utilizes it for energy, growth, and
repair.
Types of Nutrition:
1. Autotrophic Nutrition:
Organisms make their own food from simple substances.
, Example: Green plants through photosynthesis.
Photosynthesis Equation:
6CO₂ + 6H₂O + sunlight → C₆H₁₂O₆ + 6O₂
2. Heterotrophic Nutrition:
Organisms depend on others for food.
Types:
Holozoic (e.g., Humans)
Saprophytic (e.g., Fungi)
Parasitic (e.g., Tapeworm)
Human Digestive System:
Mouth: Mechanical & chemical digestion (saliva contains amylase).
Esophagus: Food pipe.
Stomach: Acidic environment; proteins begin digestion.
Small Intestine: Main site for digestion and absorption.
Large Intestine: Water absorption; forms feces.
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3. Respiration
What is Respiration?
The process of breaking down food (glucose) to release energy.
