Class 8 Science Holiday Homework – The Invisible World & Health – The Ultimate Treasure
Class 8 Science Holiday Homework. Section A: The Invisible World 1. Bread Mould Activity Aim To observe the growth of bread mould on a slice of bread. Observation I kept a slice of bread in a warm and moist place for five days. On the first day, the bread looked normal. After a few days, small green and black spots appeared. These spots gradually spread over the bread. The mould looked soft and cotton-like. Bread mould is a type of fungus that grows on moist food. Diagram provided below. 2. Types of Microorganisms A. Bacteria Uses: Used in making curd. Improve soil fertility. Help in the production of medicines. Harms: Cause diseases such as cholera and typhoid. Diagram provided below. B. Virus Uses: Used in scientific research. Help in the development of vaccines. Harms: Cause diseases such as COVID-19, polio, and influenza. Diag...