VMC VIQ Scholarship Test
ApplyRegister for Vidyamandir Intellect Quest. Get Scholarship and Cash Rewards.
NCERT Solutions for Class 8 Science Chapter 2 Microorganisms Friend and Foe: Have you ever wondered why stale bread kept in a dark and humid area grows white coloured mesh over it? With Microorganisms friend and foe Class 8 Solutions: you will learn How does the milk with a little curd kept by your mother in a hotter place turn into curd the next morning? All these questions have been discussed in solutions to NCERT Class 8 Science Chapter 2 - Microorganisms Friend and Foe, it is due to the presence of microorganisms. Class 8 Science Chapter 2 deals with the role of microorganisms in our lives. Learning would be easier, and you will learn all the concepts while going through the Class 8 Science Chapter 2 question answer. NCERT Solutions for Class 8 Science provide detailed solutions to each chapter of Class 8 Science. Scroll down to go through the questions and answers given in NCERT Solutions for Class 8 Science Chapter 2.
To effectively prepare for their exams, students must regularly practice these solutions. Students can fully comprehend the topic with the help of these solutions. If they want to take biology in higher secondary schools, they should read the chapter Microorganisms Friend and Foe. Students in the 8th standard should carefully review the NCERT Solutions for Class 8 Science Chapter 2. These responses will assist them in mastering the ideas covered in the chapter Microorganisms: Friend and Foe, which are listed above. Subject matter experts developed the NCERT Solutions for Class 8 in accordance with the most recent CBSE syllabus
What are Microorganisms?
Microorganisms are the smallest organisms that cannot be seen with the naked eye. Now, you must be wondering: if they cannot be seen with the naked eye, then how did we first get to know about them? It was mainly due to the invention of an instrument called the microscope. You will learn about the structure and workings of a microscope in Class 8 Science Chapter 2 - Microorganisms Friend and Foe. you will learn many such concepts in Microorganisms Friend and foe Class 8 NCERT Solutions. These solutions are part of NCERT Solutions for Class 8.
Types of Microorganisms:
There are five groups of microorganisms around us. These include
Microorganisms friend and foe Class 8 Solutions explains that Among the above-given microorganisms, viruses are different from the rest. How? You will learn all about in Chapter 2 Science Class 8 - Microorganisms Friend and foe of NCERT. You can also check out the NCERT Solutions (classes 6 to 12) for other chapters in science or even for other subjects by using the given links on this page.
Class 8 Microorganisms Friend and Foe NCERT Solutions:
Q.1. Fill in the blanks
Answer:
(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 .
Q.2.(a) Tick the correct answer. Yeast is used in the production of (i) sugar
(ii) alcohol
(iii) hydrochloric acid
(iv) oxygen
Answer:(a) Yeast is used in the production of (ii) Alcohol
Microorganisms Friend and Foe Class 8 NCERT Solutions:
Q.2(b). Tick the correct answer
The following is an antibiotic
(i) Sodium bicarbonate
(ii) Streptomycin
(iii) Alcohol
(iv) Yeast
Answer:(b) The following is an antibiotic (ii) Streptomycin
Class 8 Science Chapter 2 Question Answer:
Q.2(c). Tick the correct answer
Carrier of malaria-causing protozoan is
(i) female Anopheles mosquito (ii) cockroach
(iii) housefly (iv) butterfly
Answer:(c) Carrier of malaria-causing protozoan is (i) female Anopheles mosquito
Class 8 Science Chapter 2 NCERT Solutions:
Q.2(d). The most common carrier of communicable diseases is
(i) ant (ii) housefly (iii) dragonfly (iv) spider
Answer:(d) The most common carrier of communicable diseases is (ii) housefly.
Class 8 Microorganisms Friend and Foe NCERT Solutions:
Q.2(e). Tick the correct answer
The bread or idli dough rises because of
(i) heat (ii) grinding (iii) growth of yeast cells (iv) kneading
Answer:(e) The bread or idli dough rises because of (iii) The growth of yeast cells.
Microorganisms Friend and Foe Class 8 Questions and Answers:
Q.2(f). Tick the correct answer
The process of conversion of sugar into alcohol is called
(i) nitrogen fixation (ii) moulding (iii) fermentation (iv) infection
Answer:(f) The process of conversion of sugar into alcohol is called (iii) Fermentation
NCERT Solutions for Class 8 Science Chapter 2 - Microorganisms Friend and Foe
Q. 3. 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
Column A | Column B |
Bacteria | Causing Cholera |
Rhizobium | Fixing nitrogen |
Lactobacillus | Setting of curd |
Yeast | Baking of bread |
A protozoan | Causing malaria |
A virus | Causing AIDS |
Q. 4. Can microorganisms be seen with the naked eye? If not, how can they be seen?
Answer:
No, the microorganisms cannot be seen with the human naked eye because they are too small to be seen. microorganisms can be seen with the help of a scientific instrument called microscope.
Example- fungus on bread.
Microorganisms Friend and Foe Class 8 Solutions:
Q. 5. What are the major groups of microorganisms?
Answer:
The major groups of microorganisms are as follows-
(i) Bacteria- unicellular organisms. most common examples of bacteria are Salmonella typhi, Rhizobium, Mycobacterium etc. Typhoid and tuberculosis (TB) are bacterial diseases.
(ii) Fungi- Multicellular organisms which feed on dead and deaying matter. Bread mould is common examples.
(iii) Protozoa- Unicellular organisms wihich are mostly parasitic. Organisms like Amoeba, Plasmodium etc are under this category. Dysentery and malaria are caused by protozoans.
(iv) Virus- Acellular organisms which reproduce only inside the cells of the host organism. These cause diseases like chicken pox and polio.
(v) Algae- They are unicellular or multicellular organism. Spirogyra, Chlamydomonas, Ulva are some of the examples of algae.
Q6. Name the microorganisms which can fix atmospheric nitrogen in the soil.
Answer:
The microorganism that can fix atmospheric nitrogen in the soil are bacteria such as Rhizobium , and blue-green algae. These converted nitrogenous compounds can be easily used by plants for the plant protein synthesis and other purposes.
Q 7. Write 10 lines on the usefulness of microorganisms in our lives.
Answer :
Microorganisms are useful for us in the following ways-
Q. 8. Write a short paragraph on the harmful effects of microorganisms.
Answer:
The harmful effects of microorganisms are given below-
Q. 9. What are antibiotics? What precautions must be taken while taking antibiotics?
Answer:
Antibiotics- These are medicines that kill or stop the growth of the disease-causing microorganisms. There are a lot of antibiotics which are produced with the help of bacteria and fungi. Streptomycin, tetracycline and erythromycin are some of the commonly known antibiotics which are made from fungi and bacteria.
Precautions that must be taken while using antibiotics-
Answer:
Those medicines kill or stop the growth of the disease-causing microorganisms are called antibiotics. Antibiotics are
being produced from bacteria and fungi.
Precaution to be taken while using antibiotics-
NCERT Solutions for Class 8 Science Chapter 2 Microorganisms Friend and Foe
Important topics in Class 8 Science Chapter 2 Microorganisms Friend and Foe:
Section Name | Topic Name |
2 | Microorganisms Friend and Foe |
2.1 | Microorganisms |
2.2 | Where do Microorganisms Live? |
2.3 | Microorganisms and Us |
2.4 | Harmful Microorganisms |
2.5 | Food Preservation |
2.6 | Nitrogen Fixation |
2.7 | Nitrogen cycle |
The key features of Class 8 Microorganisms Friend and Foe NCERT Solutions:
Chapter 1 | |
Chapter 2 | Microorganisms Friend and Foe In Microorganisms |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | |
Chapter 16 | |
Chapter 17 | |
Chapter 18 |
We hope you will ace your examination with the help of NCERT Solutions for Class 8 Science Chapter 2 Microorganisms Friends and Foe.
Yes, the concepts studied in the chapter are useful for higher studies. The class 12 NCERT topic biology and human welfare is a continuation of this chapter. This chapter can be a foundation for the NEET exam.
Here are the topics covered in NCERT Class 8 Science chapter 2
There are 10 questions in NCERT Class 8 Science chapter 2 exercise
Application Date:09 September,2024 - 14 November,2024
Application Date:09 September,2024 - 14 November,2024
Application Date:18 September,2024 - 16 October,2024
Application Date:18 September,2024 - 16 October,2024
Register for Vidyamandir Intellect Quest. Get Scholarship and Cash Rewards.
Register for Tallentex '25 - One of The Biggest Talent Encouragement Exam
As per latest 2024 syllabus. Physics formulas, equations, & laws of class 11 & 12th chapters
As per latest 2024 syllabus. Chemistry formulas, equations, & laws of class 11 & 12th chapters
Accepted by more than 11,000 universities in over 150 countries worldwide
Register now for PTE & Unlock 20% OFF : Use promo code: 'C360SPL20'. Valid till 15th NOV'24! Trusted by 3,500+ universities globally