Class 8 Microorganisms – Friend And Foe Question and Answers

Last updated on May 18th, 2022 at 09:41 pm

Class 8 Microorganisms – Friend And Foe Question and Answers

Class 8 Microorganisms – Friend And Foe Question and Answers | Class 8 Microorganisms Question and Answers |

How many types of microorganisms are there?

There are five major groups of microorganisms, they are Bacteria, Algae, Protozoa, Fungi, and Viruses.

What are microorganisms?

Microorganisms or microbes are organisms that are so tiny that they can only be seen under a microscope.


Define Bacteria.

Bacteria are simple unicellular living creatures that may be found in air, water, soil, and the bodies of other species. Bacteria grow and multiply quickly, doubling and producing two bacteria in 10 to 30 minutes.


Define Algae.

Algae are plant-like microorganisms that contain cell walls and chlorophyll. Algae can be either unicellular or multicellular in nature.


How microorganisms are useful?

Micro-organisms are useful in making bread, cakes, pastries, alcohol, acetic acid, and medicines called antibiotics

Define virus.

Viruses are the tiniest microorganisms that can only grow inside the cells of their hosts (either animals, plants). Viruses are far smaller than bacteria. Viruses lack the majority of the features of living organisms. Diseases caused by viruses are common cold, influenza (flu), measles, polio, chickenpox, and smallpox

Define protozoa

Protozoa are a type of animal that consists of single-celled microorganisms. Protozoa produce diseases such as dysentery and malaria. Entamoeba is a protozoon that causes amoebic dysentery.

Define algae

The term “algae” refers to a large group of basic, plant-like organisms. like plants, they have chlorophyll and make food through photosynthesis.

Define fungi.

Fungi are a broad group of organisms that lack chlorophyll and do not photosynthesize. Ringworm and athlete’s foot are two human illnesses caused by fungus.

What is fermentation?

Fermentation is the process of converting sugar into alcohol through the presence of yeast. Louis Pasteur discovered fermentation in 1857.

Define vaccine.

A vaccination is a type of medication that gives protection against a specific illness. Vaccines are given to healthy people in order for them to avoid developing certain diseases throughout their lives.

What is vaccination? What is the vaccination given to child?

Vaccination is the practice of giving a vaccine, either orally or by injection, to offer protection against a certain illness. Polio, Smallpox, Cholera, Typhoid, Hepatitis, Tuberculosis (TB), Tetanus, Measles, and Diphtheria are among the illnesses that can be avoided by vaccinating children at the appropriate age.

What are communicable diseases and give examples?

Communicable diseases are diseases that can transfer from an infected person to a healthy person by air, water, food, physical contact, etc. Common cold, Cholera, Chickenpox, Tuberculosis (TB), Malaria, and AIDS are examples of communicable illnesses.

Which mosquito is the carrier of dengue in humans?

The female Aedes mosquito serves as a carrier of the dengue virus, spreading the disease from person to person.

What is food poisoning?

Food poisoning is an illness caused by the presence of a large number of microorganisms (such as bacteria and fungus) in food, or by the presence of harmful compounds in food generated by the action of microorganisms.


What are the symptoms of food poisoning?

Vomiting, diarrhea, abdominal pain, headache, and fever are the most common symptoms of food poisoning.

What is preservation? What are the methods of food preservation?

The process of providing food with a suitable physical or chemical treatment in order to prevent spoilage is known as food preservation. Sun-drying, heating, cooling, deep freezing, adding ordinary salt, sugar, mustard oil, and vinegar, using specific chemical preservatives, and pasteurization are some of the ways for preserving foods.

What is nitrogen fixation?

Nitrogen fixation is the process of turning nitrogen gas from the environment into nitrogen compounds.

Define the Nitrogen Cycle.

In nature, the nitrogen cycle refers to the movement of nitrogen through living things and the non-living environment.


Updated: May 18, 2022 — 9:41 pm

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