LIFE PROCESSES — Class 10
CBSE Notes
1. What are Life Processes?
The basic functions performed by living organisms to maintain life.
Examples: Nutrition, Respiration, Transportation, Excretion.
Energy is required for all life processes — obtained from food
through respiration.
2. Nutrition
Definition: Process by which living beings obtain and utilize food.
Types:
1. Autotrophic Nutrition:
o Organisms make their own food (e.g., green plants).
o Process: Photosynthesis
Equation:
❑
6 C O2 +6 H 2 O → C6 H 12 O6 +6 O2
❑
Raw materials: CO₂ (from air), H₂O (from soil)
Site: Chloroplasts (contain chlorophyll)
End product: Glucose and O₂
2. Heterotrophic Nutrition:
o Organisms depend on others for food.
o Types:
Holozoic: Ingestion & digestion (e.g., Humans)
Saprophytic: Feeding on dead matter (e.g., Fungi)
Parasitic: Feeding on living host (e.g., Plasmodium)
3. Nutrition in Humans
Digestive System:
CBSE Notes
1. What are Life Processes?
The basic functions performed by living organisms to maintain life.
Examples: Nutrition, Respiration, Transportation, Excretion.
Energy is required for all life processes — obtained from food
through respiration.
2. Nutrition
Definition: Process by which living beings obtain and utilize food.
Types:
1. Autotrophic Nutrition:
o Organisms make their own food (e.g., green plants).
o Process: Photosynthesis
Equation:
❑
6 C O2 +6 H 2 O → C6 H 12 O6 +6 O2
❑
Raw materials: CO₂ (from air), H₂O (from soil)
Site: Chloroplasts (contain chlorophyll)
End product: Glucose and O₂
2. Heterotrophic Nutrition:
o Organisms depend on others for food.
o Types:
Holozoic: Ingestion & digestion (e.g., Humans)
Saprophytic: Feeding on dead matter (e.g., Fungi)
Parasitic: Feeding on living host (e.g., Plasmodium)
3. Nutrition in Humans
Digestive System:
