18 Sections
131 Lessons
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Chapter 1: Crop Production and Management
The CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT for Chapter 1: Crop Production and Management provides clear, structured notes to help students understand core agricultural concepts with ease. These study materials are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exams standard. With simplified explanations, key definitions, and exam-focused content, this chapter overview supports effective learning and improves concept retention for all students.
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Chapter 2: Microorganisms: Friend and Foe
CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT: Chapter 2 — Microorganisms: Friend and Foe — concise NCERT-aligned notes, practice questions, and revision tips to master microbes, their roles, and hygiene. These study materials are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exams standard.
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Chapter 3: Synthetic Fibres and Plastics
The CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT for Chapter 3: Synthetic Fibres and Plastics provide students with clear, structured notes to understand synthetic fibres, types of plastics, their properties, and environmental concerns. These study materials are designed strictly as per the NCERT syllabus, making them ideal for the CBSE Class 8 board exams standard and effective for quick revision and exam preparation.
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Chapter 4: Materials: Metals and Non-Metals
Our CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT for Chapter 4: Materials: Metals and Non-Metals provide clear explanations, topic-wise notes, and exam-oriented practice questions. These study materials are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board-exam-level preparation.
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Chapter 5: Coal and Petroleum
Our CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT for Chapter 5: Coal and Petroleum provide clear, exam-oriented notes and practice resources. These study materials are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exam standards.
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Chapter 6: Combustion and Flame
This CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT guide for Chapter 6: Combustion and Flame provides clear, syllabus-aligned explanations to help students master key concepts. These study materials follow the NCERT curriculum strictly, making them highly effective for CBSE Class 8 board-exam-standard preparation.
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Chapter 7: Conservation of Plants and Animals
This CBSE Class 8 Science Chapter 7: Conservation of Plants and Animals study material provides clear, NCERT-based explanations to help students understand key concepts of biodiversity, deforestation, wildlife conservation and sustainable practices. These study materials are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exams standard.
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Chapter 8: Cell – Structure and Functions
The CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT for Chapter 8: Cell – Structure and Functions provide clear, syllabus-aligned explanations to help students understand cell structure, organelles, and their functions. These study materials are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exams standard and effective for quick revision and concept strengthening.
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Chapter 9: Reproduction in Animals
Explore CBSE Class 8 Science – Chapter 9: Reproduction in Animals with our chapter-wise study materials based on NCERT. These resources are designed strictly as per the NCERT syllabus and are ideal for CBSE Class 8 board exam preparation.
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Chapter 10: Reaching the Age of Adolescence
Explore comprehensive CBSE Class 8 Science study materials for Chapter 10: Reaching the Age of Adolescence. These resources are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exams.
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Chapter 11: Force and Pressure
Explore CBSE Class 8 Science Chapter 11: Force and Pressure with NCERT-based study materials tailored for CBSE Class 8 board exams. These resources offer clear explanations, diagrams, and key concepts to strengthen understanding and exam readiness. Ideal for thorough revision and concept clarity.
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Chapter 12: Friction
Explore CBSE Class 8 Science Chapter 12: Friction with study materials based on NCERT guidelines. These resources are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exam preparation and conceptual clarity.
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Chapter 13: Sound
Explore comprehensive CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT for Chapter 13: Sound. These resources are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exams. Perfect for revision, concept clarity, and exam preparation.
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Chapter 14: Chemical Effects of Electric Current
This CBSE Class 8 Science study material for Chapter 14: Chemical Effects of Electric Current provides NCERT-based notes and exam-ready content. Designed strictly as per the NCERT syllabus, it is ideal for effective CBSE Class 8 board exam preparation.
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Chapter 15: Some Natural Phenomena
Explore well-structured CBSE Class 8 Science – Chapter Wise Study Materials based on NCERT for Chapter 15: Some Natural Phenomena. These resources are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 8 board exam standards. Improve your understanding of natural events like lightning and earthquakes with clear concepts and practice questions aligned with the latest curriculum.
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Chapter 16: Light
Explore CBSE Class 8 Science – Chapter 16: Light with NCERT-based study materials tailored for CBSE board exams. This chapter-wise resource helps students build clear concepts of light, reflection, and image formation for better exam performance. Perfect for revision and practice as per the latest CBSE standards.
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Chapter 17: Stars and The Solar System
Explore CBSE Class 8 Science Chapter 17: Stars and the Solar System with NCERT-based study materials designed for CBSE board exams. This topic helps students understand celestial objects, constellations, and the solar system with clear explanations ideal for concept clarity and exam preparation.
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Chapter 18: Pollution of Air and Water
Looking for reliable study resources on CBSE Class 8 Science – Chapter Wise Study Materials Based on NCERT? This guide to Chapter 18: Pollution of Air and Water offers comprehensive, syllabus-based materials that align perfectly with the NCERT curriculum. Ideal for CBSE Class 8 board exam preparation, these study notes ensure clarity and ease of understanding while covering all key concepts in this crucial chapter.
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Microorganisms: Friend and Foe – MCQs Online Practice Test with Automatic scoring

Class 8 Science — Chapter 2: Microorganisms — 30 Q Quiz

Class 8

Science

Chapter 2

Microorganisms: Friend and Foe — 30-Question Quiz (30 minutes)

MCQs topic-wise — NCERT aligned for CBSE Class 8. Immediate feedback after each answer. Auto-submit at timeout.

Note: Once a choice is selected for a question, it is locked and immediate feedback is shown. Use the Submit button to reveal all answers at any time.

Topic: Basics & Types (Q1–Q5)

1. Which of these is an example of a unicellular fungus?

A. Penicillium B. Mould C. Yeast D. Mushroom

2. Viruses are different from bacteria because they:

A. Have cell walls B. Require a host cell to reproduce C. Are multicellular D. Always visible to naked eye

3. Which group of microorganisms is mainly responsible for photosynthesis in aquatic systems?

A. Fungi B. Algae C. Protozoa D. Bacteria

4. A pathogen is defined as:

A. A microorganism that causes disease B. Any beneficial microbe C. A microbe used in industry D. A microbe found only in soil

5. Which bacterial shape describes 'bacilli'?

A. Spherical B. Rod-shaped C. Spiral D. Filamentous

Topic: Habitats & Growth Requirements (Q6–Q10)

6. Which condition typically accelerates microbial spoilage of food?

A. Freezing B. Warmth and moisture C. Dry cold D. Airtight frozen storage

7. Extremophiles are microbes that:

A. Grow only in human body B. Need sunlight C. Thrive in extreme environments (e.g., hot springs) D. Only live in soil

8. Which human body site commonly hosts normal flora beneficial to health?

A. Gut B. Bloodstream C. Internal organs D. Sterile surgical tools

9. Why does refrigerating food help preserve it?

A. It sterilises the food B. It slows microbial metabolism and reproduction C. It adds preservatives D. It removes moisture completely

10. Standing polluted water often causes which event in ponds?

A. Decrease in microbes B. Algal bloom C. Instant sterilisation D. Water turning to ice

Topic: Beneficial Microorganisms (Q11–Q17)

11. Which microbe is used in curd/ yogurt production?

A. Yeast B. Lactobacillus C. Penicillium D. Plasmodium

12. What is the role of Rhizobium bacteria in agriculture?

A. Nitrogen fixation in legume root nodules B. Causing plant wilts C. Producing antibiotics D. Producing oxygen

13. Which process uses microbes to make alcohol?

A. Pasteurisation B. Fermentation C. Sterilisation D. Distillation

14. Penicillin, an antibiotic, is produced by:

A. Bacteria Streptococcus B. Fungus Penicillium C. Virus D. Algae

15. Bioremediation uses microbes to:

A. Increase pollution B. Degrade environmental pollutants C. Cause diseases D. Prevent plant growth

16. Microbes are used industrially to produce:

A. Enzymes and medicines (e.g., insulin) B. Only food C. Only water D. None of the above

17. Composting involves which of the following?

A. Chemical burning of waste B. Microbial decomposition of organic waste C. Freezing waste D. Sterilising waste

Topic: Harmful Microorganisms & Diseases (Q18–Q23)

18. Tuberculosis is caused by which organism?

A. Mycobacterium tuberculosis B. Influenza virus C. Candida D. Plasmodium

19. Malaria is transmitted by:

A. Contaminated water B. Mosquito vector (Anopheles) C. Airborne droplets D. Direct contact

20. Food poisoning may be caused by ingestion of:

A. Viruses only B. Parasites only C. Microbes or their toxins D. Oxygen

21. Which of these is a viral disease?

A. Cholera B. Influenza C. Ringworm D. Black blight

22. Cholera commonly spreads through:

A. Contaminated water B. Airborne droplets C. Mosquito bites D. Soil only

23. Which symptom often indicates infection by microbes?

A. Increased hair growth B. Fever C. Improved vision D. None

Topic: Controlling Microorganisms (Q24–Q27)

24. Pasteurisation is mainly used to:

A. Sterilise surgical tools B. Kill most pathogens in milk while keeping taste C. Preserve by drying D. Increase bacterial growth

25. Which is an antiseptic used on skin?

A. Iodine solution B. Bleach (for floors) C. Cooking oil D. Water only

26. Sterilisation kills:

A. All microbes including spores B. Only viruses C. Only fungi D. Nothing

27. To reduce antibiotic resistance, one should:

A. Complete the prescribed antibiotic course B. Share leftover antibiotics C. Use antibiotics for viral infections D. Overuse antibiotics in animals

Topic: Practicals & Applications (Q28–Q30)

28. During a yeast experiment, inflation of a balloon indicates production of:

A. Oxygen B. Carbon dioxide C. Nitrogen D. Hydrogen

29. Adding a spoon of curd to warm milk and keeping it warm results in:

A. Milk turning into curd by bacterial fermentation B. Instant sterilisation C. Milk evaporating D. No change

30. A simple natural way to protect stored grains from pests is to:

A. Store grains wet B. Add neem leaves and dry properly C. Keep grains in open water D. Mix with spoiled food

Score: 0 / 30

These MCQs and explanations are aligned with the NCERT Class 8 Science Chapter 2 content and are ideal for CBSE revision.

Microorganisms: Friend and Foe – MCQs with Answers and Explanations

Synthetic Fibres and Plastics – Study module with Revision Notes

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Microorganisms: Friend and Foe – MCQs Online Practice Test with Automatic scoring

Topic: Basics & Types (Q1–Q5)

Topic: Habitats & Growth Requirements (Q6–Q10)

Topic: Beneficial Microorganisms (Q11–Q17)

Topic: Harmful Microorganisms & Diseases (Q18–Q23)

Topic: Controlling Microorganisms (Q24–Q27)

Topic: Practicals & Applications (Q28–Q30)

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