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Microorganisms: Friend and Foe
Match the organisms in Column I with their action in Column II. ...

Match the organisms in Column I with the | Class 8 Science Chapter Microorganisms: Friend and Foe, Microorganisms: Friend and Foe NCERT Solutions

Welcome to the NCERT Solutions for Class 8 Science - Chapter Microorganisms: Friend and Foe. This page offers a step-by-step solution to the specific question from Exercise 1, Question 3: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 3:

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

Answer:

Column I Column II

(i) Bacteria (e) Causing Cholera

(ii) Rhizobium (a) Fixing Nitrogen

(iii) Lactobacillus (b) Setting of curd

(iv) Yeast (c) Baking of bread

(v) A protozoan (d) Causing Malaria

(vi) A Virus (f) Causing AIDS

Cholera is a water born disease which is spread by drinking impure water.
In soil, some bacteria are present like Rhizobium which fixes the nitrogen and increases the fertility of the soil.
Setting of curd is occur due to the presence of Lacto bacillus bacteria. It converts milk into curd.
Baking of bread is occurs in the presence of yeast. Growth of yeast cell increases the size of the dough.
Malaria is caused by a protozoan. The carrier of malaria caused protozoan is female Anopheles mosquito.
AIDS is caused by a virus. This disease is caused by the sexual intercourse.

Other Questions of Chapter Microorganisms: Friend and Foe

Fill in the blanks:

(a) Microorganisms can be seen with the help of a ____________.
(b) Blue green algae fix __________ directly from air to enhance fertility of soil.
(c) Alcohol is produced with the help of __________.
(d) Cholera is caused by __________.

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

(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

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

Write a short paragraph on the harms caused by microorganisms.

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

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

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

What are the major groups of microorganisms?

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Make sketches of animal and plant cells. State three differences between them.

What is a constellation? Name any two constellations.

Complete the crossword with the help of clues given below:
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.

Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.

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Select the correct word from the following list and fill in the blanks.
float, water, crop, nutrients, preparation

(a) The same kind of plants grown and cultivated on a large scale at a place is called _____________.
(b) The first step before growing crops is _____________ of the soil.
(c) Damaged seeds would _____________ on top of water.
(d) For growing a crop, sufficient sunlight and _____________ and _____________ from the soil are essential.

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Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Microorganisms: Friend and Foe.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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