Prevention of Infection and Spoilage of Food

The video discusses harmful micro-organisms known as pathogens, which cause diseases in humans, animals, and plants. It covers various diseases caused by viruses, bacteria, protozoa, and fungi. The concept of communicable diseases, which spread through air, water, and carriers like flies and mosquitoes, is explained. The video also touches on ancient preservation techniques used by Egyptians to prevent decay by depriving bacteria of necessary conditions.

Which of the following diseases is caused by a virus?

• Citrus canker

• Typhoid

• Influenza

• Anthrax

How can communicable diseases spread?

• By sharing clothes

• Through sound waves

• Via air, water, and physical contact

• Through direct sunlight

What is a common method to kill waterborne pathogens?

• Adding sugar to water

• Filtering water

• Boiling water

• Freezing water

Which insect is a known carrier of the malaria parasite?

• Housefly

• Butterfly

• Female Anopheles mosquito

• Male Aedes mosquito

What preservation technique did ancient Egyptians use to prevent decay?

• Drying in the sun

• Using spices

• Depriving bacteria of moisture, warmth, or oxygen

• Freezing