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Jan 24, 2024 · So, in NCERT Solutions and Notes Class 8 Science Chapter 2 Microorganisms: Friend and Foe we have provided summarised notes of the chapter. You also, get a free PDF of the solutions for you to download. These notes will help you recap the chapter within minutes. Let’s proceed!
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- Harmful Uses of Microorganisms
- Storage and Packing
- Nitrogen Fixation
- Nitrogen Cycle
- Questions For Practice
They can be harmful in numerous ways to humans, plants, and animals and cause diseases. As stated, the disease-causing microorganisms are known by the name of pathogens. 1. Disease-Causing Microorganisms in Humans: 1. The harmful pathogens enter the body of humans by means of air, water, or food. They can then spread to others by contact with the i...
Storage: Proper storage of food is crucial to keep it safe from harmful microorganisms. Food should be stored in clean, airtight containers and kept at the right temperature to prevent spoilage. For example, refrigeration slows down the growth of bacteria and moulds. Packing: Good packing methods protect food from contamination. Using sealed packag...
Nitrogen fixation is a process where certain microorganisms help convert nitrogen from the air into a form that plants can use. In Class 8 Science Chapter 2, you’ll learn that plants need nitrogen to grow, but they can’t use nitrogen gas (N₂) in the air directly. Certain bacteria, like those found in the roots of leguminous plants (e.g., peas, bean...
The nitrogen cycle can be defined as a biochemical process of circulating nitrogen in the atmosphere, through soil, organisms, and back to the atmosphere.The nitrogen present in the atmosphere cannot be consumed by plants or animals directly.This nitrogen needs to be converted to nitrogenous compounds by some bacteria in the soil.This converted form of nitrogen is used by the plants and when the animals feed on them they get that.Very Short Answer Type Questions 1. Name the four major groups of microorganisms. 2. Are viruses microscopic? 3. Where do microorganisms live? 4. Define fermentation. 5. Who discovered the smallpox vaccine and when? Short Answer Type Questions 1. What are antibiotics? 2. What are communicable disease? 3. Name microorganisms that cause disease in pl...
Aug 12, 2024 · CBSE Class 8 Science Notes Chapter 2 Microorganisms: Friend and Foe. Microorganisms are too small and are not visible with the naked eye. They can live in all kinds of environment, ranging from ice cold climate to hot springs, deserts and marshy lands. Microorganisms are found in air, water and in the bodies of plants and animals.
Chapter 2 Science Class 8 Notes provides a simple explanation of all the concepts discussed in this chapter. It will help students understand the beneficial and maleficial effects of microbes, from their role in everyday life to the diseases they cause.
Oct 5, 2017 · Study Material and Notes of Ch 2 Microorganisms: Friend and Foe Class 8th Science. Topics in the Chapter. • Introduction. • Microorganisms. • Classifications of microorganisms. • Food Preservation. • Methods of food preservation. → Chemical methods. → Heat and cold Treatments. → Storage and Packing. • Importance of microorganisms.
Oct 4, 2019 · Answer: Microorganisms are harmful to us in many ways. For example, microorganisms, called pathogens cause disease in humans, plants and animals. Pathogens or germs enter a healthy body through air, water, contaminated food and infected person by direct or indirect contact or by the carrier.
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In Class 8 Science Chapter 2, you’ll learn that plants need nitrogen to grow, but they can’t use the nitrogen gas (N₂) in the air directly. Certain bacteria, like those found in the roots of leguminous plants (e.g., peas, beans), have
