Class 8 Exam > Class 8 Notes > Science Class 8 > Unit Test : Microorganisms: Friend and Foe
Unit Test : Microorganisms: Friend and Foe | Science Class 8 PDF Download
Time: 1 hour
Maximum Marks: 30
Attempt all questions.
Question numbers 1 to 5 carry 1 mark each.
Question numbers 6 to 8 carry 2 marks each.
Question numbers 9 to 11 carry 3 marks each.
Question number 12 & 13 carry 5 marks each.
Q1: Who discovered the vaccine for smallpox in 1798.(1 Mark)
Q2: Fill in the blank: ___________ is the process of converting sugar into alcohol by yeast.(1 Mark)
Q3: Which of the following diseases is caused by a virus? (1 Mark)
Q4: The bacterium involved in the setting of curd is ___________. (1 Mark)
Q5: Which microorganism is commonly used in the baking industry to make bread rise? (1 Mark)
Q6: What are antibiotics? Give two examples. (2 Marks)
Q7: How do microorganisms help in the process of decomposition, and why is this process important for the environment? (2 Marks)
Q8: Describe how food poisoning occurs and mention one preventive measure. (2 Marks)
Q9: Fill in the blanks in the table below regarding common plant diseases, the microorganisms causing them, and their modes of transmission.(3 Marks)
| Plant Diseases | Micro-organism | Mode of Transmission |
|---|---|---|
| Citrus canker | ______________ | Air |
| Rust of wheat | Fungi | ______________ |
| Yellow vein mosaic of bhindi | Virus | ______________ |
Q10: How do vaccines work to protect against diseases? Give one example.(3 Marks)
Q11: Explain how microorganisms and vectors like mosquitoes cause diseases in humans, providing examples of diseases caused by each. (3 Marks)
Q12: Explain the nitrogen cycle in detail, highlighting the role of microorganisms. (5 Marks)
Q13: Describe the process of food preservation. Mention different methods used and explain why they are effective.(5 Marks)
You can find the solutions of this Unit Test here: Unit Test (Solution) : Microorganisms: Friend and Foe
The document Unit Test : Microorganisms: Friend and Foe | Science Class 8 is a part of the Class 8 Course Science Class 8.
All you need of Class 8 at this link: Class 8
|
90 videos|415 docs|44 tests
|
FAQs on Unit Test : Microorganisms: Friend and Foe - Science Class 8
| 1. What are some common benefits of microorganisms in our daily lives? |  |
Ans. Microorganisms play vital roles in various aspects of our lives. They are essential in processes like fermentation, which produces food items such as yogurt, cheese, and bread. Microorganisms also aid in digestion, enhance soil fertility by decomposing organic matter, and are crucial for the production of antibiotics and vaccines, which help in disease prevention.
| 2. How do microorganisms act as pathogens? | |
Ans. Some microorganisms, like certain bacteria, viruses, and fungi, can cause diseases in humans, animals, and plants. They invade host organisms, multiply, and can produce toxins, leading to infections and illnesses. Understanding how these pathogens operate helps in developing effective treatments and preventive measures.
| 3. Can microorganisms be beneficial for the environment? | |
Ans. Yes, microorganisms are incredibly beneficial for the environment. They participate in nutrient cycling, breaking down waste materials and organic matter, which helps clean the environment. Certain microorganisms are also used in bioremediation to break down pollutants and restore contaminated ecosystems.
| 4. What is the role of microorganisms in the human microbiome? | |
Ans. The human microbiome consists of trillions of microorganisms that reside in and on our bodies. These microbes play essential roles in maintaining health by aiding digestion, synthesizing vitamins, and protecting against harmful pathogens. A balanced microbiome is crucial for overall well-being.
| 5. How can we protect ourselves from harmful microorganisms? | |
Ans. To protect against harmful microorganisms, one should practice good hygiene, such as regular handwashing, cooking food thoroughly, and avoiding close contact with sick individuals. Vaccination is also a key preventive measure against many infectious diseases caused by microorganisms.
About this Document
1.4K Views
4.65/5
Rating
Sep 05, 2025
Last updated
Related Exams
Document Description: Unit Test : Microorganisms: Friend and Foe for Class 8 2025 is part of Science Class 8 preparation.
The notes and questions for Unit Test : Microorganisms: Friend and Foe have been prepared according to the Class 8 exam syllabus. Information about Unit Test : Microorganisms: Friend and Foe covers topics
like and Unit Test : Microorganisms: Friend and Foe Example, for Class 8 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Unit Test : Microorganisms: Friend and Foe.
Introduction of Unit Test : Microorganisms: Friend and Foe in English is available as part of our Science Class 8
for Class 8 & Unit Test : Microorganisms: Friend and Foe in Hindi for Science Class 8 course.
Download more important topics related with notes, lectures and mock test series for Class 8
Exam by signing up for free. Class 8: Unit Test : Microorganisms: Friend and Foe | Science Class 8
Description
Full syllabus notes, lecture & questions for Unit Test : Microorganisms: Friend and Foe | Science Class 8 - Class 8 | Plus excerises question with solution to help you revise complete syllabus for Science Class 8 | Best notes, free PDF download
Information about Unit Test : Microorganisms: Friend and Foe
In this doc you can find the meaning of Unit Test : Microorganisms: Friend and Foe defined & explained in the simplest way possible. Besides explaining types of
Unit Test : Microorganisms: Friend and Foe theory, EduRev gives you an ample number of questions to practice Unit Test : Microorganisms: Friend and Foe tests, examples and also practice Class 8
tests
Related Searches
MCQs
,video lectures
,Sample Paper
,Unit Test : Microorganisms: Friend and Foe | Science Class 8
,Unit Test : Microorganisms: Friend and Foe | Science Class 8
,shortcuts and tricks
,Extra Questions
,Semester Notes
,Viva Questions
,mock tests for examination
,study material
,Free
,Important questions
,ppt
,Previous Year Questions with Solutions
,Exam
,practice quizzes
,Objective type Questions
,Unit Test : Microorganisms: Friend and Foe | Science Class 8
,Summary
,past year papers
;
Additional Information about Unit Test : Microorganisms: Friend and Foe for Class 8 Preparation
Unit Test : Microorganisms: Friend and Foe Free PDF Download
The Unit Test : Microorganisms: Friend and Foe is an invaluable resource that delves deep into the core of the Class 8 exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Unit Test : Microorganisms: Friend and Foe now and kickstart your journey towards success in the Class 8 exam.
Importance of Unit Test : Microorganisms: Friend and Foe
The importance of Unit Test : Microorganisms: Friend and Foe cannot be overstated, especially for Class 8 aspirants.
This document holds the key to success in the Class 8 exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Unit Test : Microorganisms: Friend and Foe Notes
Unit Test : Microorganisms: Friend and Foe Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Unit Test : Microorganisms: Friend and Foe.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
Additionally, the paper analysis provides valuable tips for tackling the exam strategically.
Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Unit Test : Microorganisms: Friend and Foe Notes on EduRev are your ultimate resource for success.
Unit Test : Microorganisms: Friend and Foe Class 8 Questions
The "Unit Test : Microorganisms: Friend and Foe Class 8 Questions" guide is a valuable resource for all aspiring students preparing for the
Class 8 exam. It focuses on providing a wide range of practice questions to help students gauge
their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Unit Test : Microorganisms: Friend and Foe on the App
Students of Class 8 can study Unit Test : Microorganisms: Friend and Foe alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Unit Test : Microorganisms: Friend and Foe,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Unit Test : Microorganisms: Friend and Foe is prepared as per the latest Class 8 syllabus.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up
within 7 days!
within 7 days!
Takes less than 10 seconds to signup