Login / Register
Follow Us
0
0
Register Free!
Register Free!
Online Mock Tests & Exam Preparation | Target Exams
Select Medium:
🇬🇧 English Medium Active 🇮🇳 ગુજરાતી માધ્યમ
Gujarat Board Class VIII Science Set 02 (Advanced Level) English Medium 100% Free Practice Test

Gujarat Board Class VIII Science: Microorganisms: Friend and Foe Online Test (Set 02 (Advanced Level)) | TargetExams

Microorganisms: Friend and Foe — Set 02 (Advanced Level)

Take free online mock test for Gujarat Board Class VIII Science chapter 'Microorganisms: Friend and Foe'. 20 MCQs, 20 minutes, detailed solutions & score analysis.

📝
20 MCQs
Questions
⏱️
20 Mins
Duration
🎯
20 Marks
Total Marks
➕
+1.0
Per Correct
🛡️
0.0
Negative Mark
🌐
English
Language
Start Test Now (English Medium)
Instant Scorecard Step-by-Step Solutions GSEB Pattern

Chapter Study Guide & In-Depth Notes

Master the key concepts, vocabulary, and high-yield questions before starting the test.

3 Sections

Chapter Overview & Core Concepts: Microorganisms: Friend and Foe

Class 8 Study Guide

Mastering Microorganisms: Friend and Foe in Class 8 provides critical subject intuition, analytical skills, and examination readiness.

Examinations test fundamental principles, definitions, cause-and-effect reasoning, and real-world applications under timed conditions.

Core Moral & Key Takeaway:

Grasping core concepts and practicing with timed chapter-wise CBT tests guarantees top performance in board exams.

Key Terminology, Definitions & Principles

Glossary & Concepts
Term / Formula Type Definition / Meaning Explanation / Notes Example / Usage
Core Concept Principle Primary concept governing Microorganisms: Friend and Foe. मुख्य सिद्धांत "Understand and apply the principle accurately."
Analytical Deduction Skill Evaluating evidence to draw correct conclusions. तार्किक विश्लेषण "Examine question clues systematically."

Key Features & Devices Explored:

Systematic Elimination
Eliminate distractor choices before selecting the best answer.
Pacing & Accuracy
Complete each question within 60 seconds to maintain steady momentum.

High-Yield Revision Points & Solved Board Exam Q&A

Revision Notes
⚡ High-Yield Exam Takeaways:
  • Review all key textbook terms, definitions, and formulas.
  • Pay attention to units, boundary values, and key keywords in questions.
  • Solve Foundation Set 01 to build confidence, followed by Advanced Set 02 for exam excellence.
Frequently Asked Questions & Model Answers:
Q1 How should students prepare for Microorganisms: Friend and Foe exams?
Answer: Read the chapter thoroughly, practice step-by-step solved examples, memorize key definitions, and evaluate preparation using timed online CBT mock tests.

Sample Questions Preview

Free Sneak Peek

Here is a sneak peek of the questions included in this test set. Test your preparation by viewing the answer and detailed explanation before starting the timed exam.

Q1
Why are antibiotics like penicillin ineffective in curing viral infections such as the common cold or influenza?
Why are antibiotics like penicillin ineffective in curing viral infections such as the common cold or influenza?
સામાન્ય શરદી અથવા ઈન્ફલ્યુએન્ઝા જેવા વાયરલ ચેપના ઉપચારમાં પેનિસિલિન જેવી એન્ટિબાયોટિક્સ કેમ બિનઅસરકારક છે?
સામાન્ય શરદી અથવા ઈન્ફલ્યુએન્ઝા જેવા વાયરલ ચેપના ઉપચારમાં પેનિસિલિન જેવી એન્ટિબાયોટિક્સ કેમ બિનઅસરકારક છે?
A
Antibiotics inhibit bacterial cell wall synthesis and metabolic pathways which viruses lack completely / Antibiotics inhibit bacterial cell wall synthesis and metabolic pathways which viruses lack completelyએન્ટીબાયોટિક્સ બેક્ટેરિયલ કોષ દિવાલ સંશ્લેષણ અને મેટાબોલિક માર્ગોને અટકાવે છે જેમાં વાયરસનો સંપૂર્ણ અભાવ હોય છે / એન્ટીબાયોટિક્સ બેક્ટેરિયલ કોષ દિવાલ સંશ્લેષણ અને મેટાબોલિક માર્ગોને અટકાવે છે જેમાં વાયરસનો સંપૂર્ણ અભાવ હોય છે
B
Viruses absorb antibiotics as food nutrients / Viruses absorb antibiotics as food nutrientsવાયરસ એન્ટીબાયોટીક્સને ખોરાકના પોષક તત્વો તરીકે શોષી લે છે / વાયરસ એન્ટીબાયોટીક્સને ખોરાકના પોષક તત્વો તરીકે શોષી લે છે
C
Antibiotics freeze inside the human throat / Antibiotics freeze inside the human throatએન્ટીબાયોટીક્સ માનવ ગળાની અંદર જામી જાય છે / એન્ટીબાયોટીક્સ માનવ ગળાની અંદર જામી જાય છે
D
Common cold viruses are immune to all chemicals / Common cold viruses are immune to all chemicalsસામાન્ય શરદીના વાઇરસ બધા રસાયણો માટે પ્રતિરક્ષા છે / સામાન્ય શરદીના વાઇરસ બધા રસાયણો માટે પ્રતિરક્ષા છે
Correct Answer: Option A
Explanation:
Explanation: Viruses use host cellular machinery and do not possess cell walls or bacterial metabolic pathways targeted by antibiotics.
સમજૂતી: Viruses use host cellular machinery and do not possess cell walls or bacterial metabolic pathways targeted by antibiotics.
સમજૂતી: વાયરસ યજમાન સેલ્યુલર મશીનરીનો ઉપયોગ કરે છે અને એન્ટિબાયોટિક્સ દ્વારા લક્ષિત કોષની દિવાલો અથવા બેક્ટેરિયલ મેટાબોલિક માર્ગ ધરાવતા નથી. એન્ટિબાયોટિક્સ દ્વારા લક્ષિત.
Q2
How does an administered vaccine confer long-lasting active immunity inside the human body?
How does an administered vaccine confer long-lasting active immunity inside the human body?
વ્યવસ્થિત રસી માનવ શરીરની અંદર લાંબા સમય સુધી ચાલતી સક્રિય પ્રતિરક્ષા\પ્રતિરક્ષા કેવી રીતે પ્રદાન કરે છે?
સંચાલિત રસી માનવ શરીરની અંદર લાંબા સમય સુધી ચાલતી સક્રિય રોગપ્રતિકારક શક્તિ કેવી રીતે પ્રદાન કરે છે?
A
It destroys all blood cells and replaces them with plastic cells / It destroys all blood cells and replaces them with plastic cellsતે તમામ રક્ત કોશિકાઓનો નાશ કરે છે અને તેને પ્લાસ્ટિક કોશિકાઓ સાથે બદલી નાખે છે / તે તમામ રક્ત કોશિકાઓનો નાશ કરે છે અને તેને પ્લાસ્ટિક કોષો સાથે બદલી નાખે છે
B
Dead or weakened pathogens trigger production of antibodies and establish immunological memory cells without causing actual disease / Dead or weakened pathogens trigger production of antibodies and establish immunological memory cells without causing actual diseaseમૃત અથવા નબળા પેથોજેન્સ એન્ટિબોડીઝના ઉત્પાદનને ટ્રિગર કરે છે અને વાસ્તવિક રોગ પેદા કર્યા વિના ઇમ\મ્યુનોલોજિકલ મેમરી કોષો સ્થાપિત કરે છે / મૃત અથવા નબળા પેથોજેન્સ એન્ટિબોડીઝના ઉત્પાદનને ટ્રિગર કરે છે અને વાસ્તવિક રોગ પેદા કર્યા વિના ઇમ\મ્યુનોલોજિકલ મેમરી કોષો સ્થાપિત કરે છે
C
It raises core body temperature to 60°C permanently / It raises core body temperature to 60°C permanentlyતે શરીરના મુખ્ય તાપમાનને કાયમી ધોરણે 60°C સુધી વધારી દે છે / તે શરીરના મુખ્ય તાપમાનને કાયમ માટે 60°C સુધી વધારી દે છે
D
It neutralizes blood water completely / It neutralizes blood water completelyતે લોહીના પાણીને સંપૂર્ણપણે નિષ્ક્રિય કરે છે / તે લોહીના પાણીને સંપૂર્ણપણે તટસ્થ કરે છે
Correct Answer: Option B
Explanation:
Explanation: Antigens in vaccines train B-lymphocytes to produce neutralizing antibodies and memory cells for rapid future defense.
સમજૂતી: Antigens in vaccines train B-lymphocytes to produce neutralizing antibodies and memory cells for rapid future defense.
સમજણ: રસીમાં એન્ટિજેન્સ બી-લિમ્ફોસાઇટ્સને ra\pid ભવિષ્યના સંરક્ષણ માટે તટસ્થ એન્ટિબોડીઝ અને મેમરી કોષો પેદા કરવા તાલીમ આપે છે.

Ready to attempt all 20 questions in exam environment?

Get real-time countdown timer, question palette navigator, and instant analytics.

How Chapter-Wise Online CBT Tests Build Winning Habits for Future Competitive Exams

Early practice in high school builds the mental muscle, speed, and analytical discipline required to ace NTSE, Olympiads, JNVST, CUET, and Foundation JEE/NEET.

Competitive Edge

Real-Time Clock Awareness & Pacing

समय प्रबंधन एवं गति नियंत्रण

In school examinations, students write answers without active pacing. In national entrance tests, students have barely 45-60 seconds per MCQ. Practicing with a 20-minute timer instills instinctive time-budgeting and prevents last-minute exam panic.

Mastery of the Elimination Technique

विकल्प निष्कासन विधि में दक्षता

Top rankers in competitive exams rarely compute every problem blindly. They spot subtle traps, evaluate extreme values, and eliminate 2 out of 4 distractors within seconds. Our 4-option sets teach critical distractor analysis.

CBT Screen Stamina & Digital Comfort

कंप्यूटर आधारित परीक्षा का सहज अभ्यास

Almost all major national exams (CUET, JEE, NEET, SSC, Banking) are 100% computer-based. Students who only study on paper experience eye strain and navigation mistakes on exam day. Early CBT practice creates effortless digital fluency.

Immunity to Negative Marking

सटीकता और नकारात्मक अंकन से सुरक्षा

Careless errors—such as misreading "NOT" or "EXCEPT"—ruin thousands of competitive aspirations each year. Regular objective testing builds the habit of double-checking question keywords before locking answers.

Instant Diagnostic Feedback Loop

तत्काल त्रुटि निवारण एवं आत्म-मूल्यांकन

Traditional paper tests take weeks to grade, by which time the student has forgotten their thought process. TargetExams provides instant scorecards and step-by-step solutions while the conceptual puzzle is still fresh.

Start Building Your Competitive Edge from Class

Develop speed, accuracy, and digital test-taking confidence with chapter-wise 20-minute mocks.

Syllabus Concepts Evaluated in this Chapter

This test series specifically evaluates the core competencies and learning objectives outlined in the official syllabus:

  • Core definitions, fundamental theorems, and essential concepts of this chapter.
  • Step-by-step mathematical reasoning and deductive problem-solving.
  • Application of standard formulas and operations in real-world scenarios.
  • Critical examination of common exam pitfalls and misleading options.
  • Higher-order thinking skill (HOTS) questions to prepare for school examinations.
  • Speed and accuracy mastery under standard timed CBT exam conditions.

Exam Rules & Test Taking Guidelines

  • Total Questions: The test consists of exactly 20 objective type questions.
  • Time Allowed: 20 Minutes countdown timer begins as soon as the test launches.
  • Marking Scheme: +1.0 mark is awarded for each correct answer.
  • Zero Penalty: There is 0.0 negative marking for incorrect or unattempted questions.
  • Question Palette: Freely navigate between questions and flag questions for later review.
  • Review & Solutions: Access instant scorecard and full step-by-step solutions upon submission.

Frequently Asked Questions (FAQs)

Yes! Foundation Practice Set 01 for every chapter in Gujarat Board Class VIII Science is 100% free to attempt. Students can test their knowledge without any payment or hidden fees.
This page is dedicated to English Medium. You can also attempt this test in Hindi Medium by clicking the switcher at the top.
Absolutely. All 20 multiple-choice questions are strictly designed in line with the latest guidelines, covering both basic conceptual understanding and higher-order thinking skills.
The test contains 20 MCQs to be solved in 20 minutes. Each question carries +1.0 mark for a correct answer, and there is zero (0.0) negative marking for incorrect answers.
Yes. Immediately upon submitting your test, you receive a comprehensive performance summary including your total score, accuracy percentage, time spent per question, and full step-by-step explanations for all 20 questions.

Practice Sets in this Chapter

Set 01 (Foundation)

20 MCQs • 20 Mins
View

Set 02 (Advanced)

20 MCQs • 20 Mins
Current

More Chapters in this Subject

🎯 Start Preparation

Begin with this 20-minute practice set to test your conceptual accuracy and prepare for top ranks in your school examinations.

Microorganisms: Friend and Foe (Set 02 (Advanced Level))
20 MCQs • 20 Mins • 100% Free Practice Test

Select Test Language Medium

Choose the language medium you want to attempt this online test in:

ગુજરાતી માધ્યમ (Gujarati Medium) GSEB Curriculum
Displays questions, options, and explanations in the regional medium.
English Medium
Displays questions, options, and explanations in English medium.
Both (English + Regional)
Displays questions and options in English & Regional side-by-side.