Life Processes in Animals
Class 7 – NCERT Curiosity
(With Diagrams & Questions)
Introduction
Life processes are the basic activities performed by animals to maintain life. These include
nutrition, respiration, circulation, excretion and reproduction.
1. Nutrition in Animals
Animals depend on plants and other animals for food. Hence, they are called heterotrophs.
Diagram: Human Digestive System (Flow Diagram)
Mouth
↓
Oesophagus
↓
Stomach
↓
Small Intestine
↓
Large Intestine
↓
Anus
2. Respiration
Respiration is the process of releasing energy from food using oxygen.
Diagram: Human Respiratory System
Nose
↓
Trachea (Windpipe)
↓
Lungs
↓
Alveoli (Air Sacs)
3. Circulation
The circulatory system transports oxygen, nutrients and wastes throughout the body.
Diagram: Human Heart (Simplified)
Right Atrium Left Atrium
↓ ↓
Class 7 – NCERT Curiosity
(With Diagrams & Questions)
Introduction
Life processes are the basic activities performed by animals to maintain life. These include
nutrition, respiration, circulation, excretion and reproduction.
1. Nutrition in Animals
Animals depend on plants and other animals for food. Hence, they are called heterotrophs.
Diagram: Human Digestive System (Flow Diagram)
Mouth
↓
Oesophagus
↓
Stomach
↓
Small Intestine
↓
Large Intestine
↓
Anus
2. Respiration
Respiration is the process of releasing energy from food using oxygen.
Diagram: Human Respiratory System
Nose
↓
Trachea (Windpipe)
↓
Lungs
↓
Alveoli (Air Sacs)
3. Circulation
The circulatory system transports oxygen, nutrients and wastes throughout the body.
Diagram: Human Heart (Simplified)
Right Atrium Left Atrium
↓ ↓
