Human Needs Chapter Notes | Science Olympiad Class 4 PDF Download

Human Needs

To ensure their survival, humans have fundamental requirements, including air, water, food, and shelter.

Air

• The intake of air is essential for human beings to breathe and sustain life.
• Respiration occurs through the nostrils, as humans inhale and exhale.
• The absence of air would prevent humans from breathing, leading to their demise.

Water

Water holds significant importance for humans as it serves multiple crucial functions:

• Replenishing the water lost through activities such as breathing, sweating, and urination.
• Eliminating waste from the body.
• Facilitating digestion.
• Promoting overall health and well-being.
• Regulating body temperature.
• Enabling bathing, cleaning, and washing.
• The human body primarily consists of water, accounting for over half of its weight.
• Loss of water transpires through respiration, perspiration, and urination.
• In order to maintain a healthy body, it is recommended to consume seven glasses of water daily.
• Additionally, water is obtained through the consumption of water-rich foods, such as fruits and vegetables.

Food

• Food is a vital necessity for human survival.
• It enables growth, provides energy, and facilitates the repair and regeneration of cells and tissues.
• A well-balanced diet is crucial for maintaining good health, incorporating appropriate quantities from all food groups.
• Food and water are essential for human growth and overall well-being.

Shelter

• Shelter is a necessity for humans to safeguard themselves against various dangers and harsh weather conditions, including heat, cold, rain, and storms.
• Human shelters encompass different types, such as double-story houses, long houses, apartments, single-story houses, huts, and flats.