Life Processes in Animals Class 7 Notes

Life Processes in Animals Class 7 Notes

Life Processes in Animals Class 7 Notes

1. Life processes: The processes essential for survival of living beings.
2. Oral hygiene: The practice of keeping the mouth, teeth, and gums clean and healthy to prevent disease.
3. Oesophagus: (Food-pipe), A long, flexible tube for transferring the food from the mouth to the stomach.
4. Nutrition: The process by which living organisms obtain and use food for energy and growth.
5. Digestion: The breakdown of food into simpler substances that can be absorbed by the body.
6. Alimentary Canal: A long tube in the body where food travels and is digested, starting from the mouth and ending at the anus.
7. Mechanical digestion: The process of initial breakdown of food into fine pieces.
8. Chemical Digestion: The process of breaking down food using enzymes and acids into simpler molecules.

1. Life Processes

Major life processes:

1. Nutrition
2. Respiration
3. Circulation
4. Excretion
5. Reproduction

2. Nutrition in Animals

Alimentary Canal:

1. Parts: Mouth, Oesophagus, Stomach, Small Intestine, Large Intestine, Anus.
2. Function: Breakdown of complex food into simpler forms.

Digestion Process:

1. Mechanical Digestion: Initial breakdown of food by teeth in the mouth.
2. Chemical Digestion: Breakdown of food by digestive juices.

Absorption:

1. Primary site: Small Intestine.
2. Nutrients absorbed into the bloodstream for distribution.

Types of Feeding:

1. Ruminants: Animals like cows that partially chew food and then ruminate.
2. Birds: Use gizzards to break down food without teeth.

3. Respiration in Animals:

Parts: Nostrils, windpipe, lungs and alveoli

Breathing Mechanism:

1. Inhalation: Movement of air into the lungs.
2. Exhalation: Movement of air out of the lungs.

Gas Exchange:

1. Occurs in alveoli of lungs.
2. Oxygen is used to break down glucose into carbon dioxide and water.

Types of Respiration:

1. Aerobic Respiration: Requires oxygen.
2. Anaerobic Respiration: Occurs without oxygen (less common in animals).

4. Circulatory System

1. Components: Heart, blood vessels, and blood.
2. Functions: Transports nutrients and oxygen throughout the body.

Role in waste removal from the body.

5. Excretion

1. Removal of waste products from the body.
2. Importance of maintaining homeostasis.

6. Reproduction

1. Essential for the continuation of species.
2. Can be sexual or asexual, varying among different animal groups