Chapter: Science8 The Invisible Living World…

✓ Free notes class 8 Science 1 study file

About these notes

Class 8 Science The Invisible Living World (CBSE and Bihar Board) notes introduce microbes and give concise chapter summaries, key definitions and quick revision tips for school tests. Main sub-topics: types of microorganisms (bacteria, viruses, fungi, protozoa, algae), bacterial structure and binary fission, useful microbes in fermentation and food, pasteurization and sterilization, infectious diseases, antibiotics and vaccination, methods to culture and control microbes. These notes are for Class 8 students preparing for term exams, chapter test and board-pattern practice; use them with Merit Spring ROH chapter tests and mock tests for timed revision and important questions practice.

Key points you will learn

Class 8 Science The Invisible Living World — key terms: microbe, bacteria, virus, fungus, protozoa, algae
Structure of bacteria: cell wall, capsule, flagella and binary fission as the common reproduction method
Viruses vs bacteria: viruses need host cells to multiply; antibiotics act on bacteria but not on viruses
Useful microbes: fermentation in curd, bread and alcohol; role in decomposition and nitrogen fixation
Control methods: pasteurization, sterilization, hygiene and vaccination to prevent infectious diseases
Remember examples: penicillin (antibiotic), yeast in fermentation, moulds in spoilage — write examples in answers
Exam-tip: memorise short definitions, practise MCQ and question answer formats and label one simple diagram

What is inside this chapter

📄

Science8 The Invisible Living World Notes (Class 8 Science)

Class 8 Science Science8 The Invisible Living World handwritten-style revision notes for CBSE and Bihar Board students.

📥 Open notes

Questions students ask

How do I use Class 8 Science The Invisible Living World notes for quick revision?

Use the notes to make a one-page revision sheet: list definitions, a few labelled diagrams, and 6–8 example microbes with uses or diseases. After this, attempt a chapter test on Merit Spring ROH to check weak areas.

What are the main topics I must remember from this chapter?

Focus first on types of microorganisms, bacterial structure and binary fission, examples of useful and harmful microbes, fermentation, pasteurization, and basic disease-prevention methods like vaccination and hygiene. Keep short examples ready for answers.

Difference between bacteria and viruses?

Bacteria are single-celled organisms that can live and reproduce independently; viruses are non-cellular and require a host cell to replicate. In exam answers mention size, living condition and that antibiotics work on bacteria but not on viruses.

Where to find Class 8 Science The Invisible Living World notes and important questions?

Access the chapter notes on Merit Spring ROH under Class 8 Science; the site also provides chapter tests and board-pattern mock tests you can use to practise important questions after revision. Bookmark the chapter for repeated practice.

Does the chapter explain fermentation and pasteurization?

Yes — the chapter describes fermentation (microbial conversion used in curd, bread and alcohol) and pasteurization as heating to reduce spoilage microbes; include one example of each when answering short questions.

More Science chapters

Chapter: Science8 Exploring the Investigative World of Science Chapter: Science8 Health The Ultimate Treasure Chapter: Science8 Electricity Magnetic and Heating Effects Chapter: Science8 Exploring Forces Chapter: Science8 Winds Storms and Cyclones Chapter: Science8 Particulate Nature of Matter All chapters →

class 8 — other subjects

ENGLISH Social Science

Merit Spring App install karein

App Theme