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NCERT solutions for Class 8 Science chapter 2 - Microorganisms : Friend and Foe

Science Textbook For Class 8

Chapters

NCERT Science Class 8

Science Textbook For Class 8

Chapter 2 - Microorganisms : Friend and Foe

Pages 29 - 30

Q 1.1 | Page 29

Fill in the blanks:

Microorganisms can be seen with the help of a _________

Q 1.2 | Page 29

Fill in the blanks:

Blue green algae fix _________ directly from air to enhance fertility of soil

Q 1.3 | Page 29

Fill in the blanks:

Alcohol is produced with the help of _________

Q 1.4 | Page 29

Fill in the blanks:

Cholera is caused by _________.

Q 2.1 | Page 29

Tick the correct answer:

Yeast is used in the production of

(1) sugar

(2) alcohol

(3) hydrochloric acid

(4) oxygen

Q 2.2 | Page 29

Tick the correct answer:

The following is an antibiotic

(1) Sodium bicarbonate

(2) Streptomycin

(3) Alcohol

(4) Yeast

Q 2.3 | Page 29

Tick the correct answer:

Carrier of malaria-causing protozoan is

(1) female Anopheles mosquito

(2) cockroach

(3) housefly

(4) butterfly

Q 2.4 | Page 29

Tick the correct answer:

The most common carrier of communicable diseases is

(1) ant

(2) housefly

(3) dragonfly

(4) spider

Q 2.5 | Page 29

Tick the correct answer:

The bread or idli dough rises because of

(1) heat

(2) grinding

(3) growth of yeast cells

(4) kneading

Q 2.6 | Page 29

Tick the correct answer:

The process of conversion of sugar into alcohol is called

(1) nitrogen fixation

(2) moulding

(3) fermentation

(4) infection

Q 3 | Page 29

Match the organisms in Column I with their action in Column II.

  Column I   Column II
1 Bacteria a Fixing Nitrogen
2 Rhizobium b Setting of curd
3 Lactobacillus c Baking of bread
4 Yeast d Causing Malaria
5 A protozoan e Causing Cholera
6 A Virus f Causing AIDS
    g Producing antibodies
Q 4 | Page 29

Can microorganisms be seen with the naked eye? If not, how can they be seen?

Q 5 | Page 30

What are the major groups of microorganisms?

Q 6 | Page 30

Name the microorganisms which can fix atmospheric nitrogen in the soil.

Q 7 | Page 30

Write 10 lines on the usefulness of microorganisms in our lives.

Q 8 | Page 30

Write a short paragraph on the harms caused by microorganisms.

Q 9 | Page 30

What are antibiotics? What precautions must be taken while taking antibiotics?

NCERT Science Class 8

Science Textbook For Class 8

NCERT solutions for Class 8 Science chapter 2 - Microorganisms : Friend and Foe

NCERT solutions for Class 8 Science chapter 2 (Microorganisms : Friend and Foe) include all questions with solution and detail explanation from Science Textbook For Class 8. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has created the CBSE Science Textbook For Class 8 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at shaalaa.com are providing such solutions so that students can prepare for written exams. These NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 8 Science chapter 2 Microorganisms : Friend and Foe are Concept of Microorganisms, Concept of Microorganisms Live, Microorganisms and Us, Concept of Harmful Microorganisms, Food Preservation, Nitrogen Fixation, Nitrogen Cycle.

Using NCERT solutions for Class 8 Science by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 8 prefer NCERT Textbook Solutions to score more in exam.

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