Microorganism : Friend and Foe - Class 8 Science - Chapter 2 - Notes, NCERT Solutions & Extra Questions
Renews every month. Cancel anytime
Your personal doubt-solving assistant
Chatterbot AI gives you 100% accurate answers to your questions in an instant.
Notes - Microorganism : Friend and Foe | Class 8 NCERT | Science
Comprehensive Notes on Microorganism: Friend and Foe for Class 8 Students
Microorganisms, also known as microbes, are tiny living organisms that cannot be seen with the unaided eye. They are omnipresent and play both beneficial and harmful roles in our lives. This article delves into the fascinating world of microorganisms, classified into various types, their benefits, detrimental effects, and their crucial role in natural processes.
Introduction to Microorganisms
What Are Microorganisms or Microbes?
Microorganisms are minute living organisms, which can be unicellular or multicellular. Examples include the greyish patches on moist bread during the rainy season. Under...
We've got so much more in store, just for you! 🤩
Sign up to unlock Notes and everything else
Unlock now 🔓🚀 Learn more about Notes with Chatterbot AI
Notes - Flashcards - Microorganism : Friend and Foe | Class 8 NCERT | Science
Back Questions - Microorganism : Friend and Foe | NCERT | Science | Class 8
Fill in the blanks.
(a) Microorganisms can be seen with the help of a ____________.
(b) Blue-green algae fix __________ directly from the air and enhance the fertility of soil.
(c) Alcohol is produced with the help of __________.
(d) Cholera is caused by __________.
(a) Microorganisms can be seen with the help of a microscope.
(b) Blue green algae fix nitrogen directly from air and enhance fertility of soil.
(c) Alcohol is produced with the help of yeast.
(d) Cholera is caused by bacteria.
Tick the correct answer.
(a) Yeast is used in the production of
(i) sugar (ii) alcohol (iii) hydrochloric acid (iv) oxygen
(b) The following is an antibiotic
(i) Sodium bicarbonate (ii) Streptomycin (iii) Alcohol (iv) Yeast
(c) Carrier of malaria-causing protozoan is
(i) female Anopheles mosquito (ii) cockroach (iii) housefly (iv) butterfly
(d) The most common carrier of communicable diseases is
(i) ant (ii) housefly (iii) dragonfly (iv) spider
(e) The bread or idli dough rises because of
(i) heat (ii) grinding (iii) growth of yeast cells (iv) kneading
(f) The process of conversion of sugar into alcohol is called
(i) nitrogen fixation (ii) moulding (iii) fermentation (iv) infection
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Match the organisms in Column A with their action in Column B.
A | B |
---|---|
(i) Bacteria | (a) Fixing nitrogen |
(ii) Rhizobium | (b) Setting of curd |
(iii) Lactobacillus | (c) Baking of bread |
(iv) Yeast | (d) Causing malaria |
(v) A protozoan | (e) Causing cholera |
(vi) A virus | (f) Causing AIDS |
(g) Producing antibodies |
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Can microorganisms be seen with the naked eye? If not, how can they be seen?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
What are the major groups of microorganisms?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Name the microorganisms which can fix atmospheric nitrogen in the soil.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Write 10 lines on the usefulness of microorganisms in our lives.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Write a short paragraph on the harmful effects of microorganisms.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
What are antibiotics? What precautions must be taken while taking antibiotics?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AIShort Questions - Microorganism : Friend and Foe | NCERT | Science | Class 8
What are microorganisms and where can they be found?
Microorganisms, also known as microbes, are tiny living organisms that are usually too small to be seen with the unaided eye. They can be found everywhere around us; in air, soil, water, inside our bodies, on our skin, on other living organisms, and even in extreme conditions such as deep sea vents and polar ice caps.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
How do pathogens cause diseases in humans, animals, and plants?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
The process of inducing immunity in an organism usually through vaccination is called ______.
A) prevention
B) immunisation
C) treatment
D) inflammation
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AIExtra Questions - Microorganism : Friend and Foe | NCERT | Science | Class 8
A disease that lasts for a short period of time is called an acute disease.
A) True
B) False
The correct option is A) True
Diseases that last only for a short period of time are referred to as acute diseases. Examples include ailments like the common cold or a broken bone. In contrast, diseases that persist for a longer duration, often years, are known as chronic diseases. Conditions such as diabetes and AIDS fall into this category.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Which of the following is true about spores?
A) They can tolerate extreme dryness.
B) They can't be killed even at extreme temperatures.
C) They rupture during unfavorable conditions.
D) They can tolerate poisonous chemicals.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Which of the following is a correct match with reference to pathogen and its site of attack (body cell/organ) in the human body?
A. Ascaris - Lymphatic vessels
B. Trichophyton - Lungs
C. Plasmodium - Hepatocytes and RBCs
D. Entamoeba - Small intestine
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Contagium vivum fluidum was proposed by:
A) D.J. Ivanowsky
B) M.W. Beijerinck
C) Stanley
D) Robert Hooke
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AILong Questions - Microorganism : Friend and Foe | NCERT | Science | Class 8
How can microorganisms either harm or benefit us?
Microorganisms can have both harmful and beneficial effects on us. On the one hand, some microorganisms, known as pathogens, can cause diseases in humans, animals and plants. On the other hand, many microorganisms are beneficial, playing a vital role in processes such as food production (e.g. bread, yogurt), medicine production (e.g. antibiotics), and waste decomposition. They also play a critical role in nitrogen fixation and the nitrogen cycle, processes that are essential for life on earth.
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Explore the concept of nitrogen fixation by microorganisms such as Rhizobium. Why is nitrogen fixation important for the environment and how can microorganisms contribute to this process?
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
Improve your grades!
Join English Chatterbox to access detailed and curated answers, and score higher than you ever have in your exams.
Sign up now![Boost your exam scores](https://www.englishchatterbox.com/frontend/v4/assets/img/rocket-launch.png)
💡 Have more questions?
Ask Chatterbot AI