NCERT - 8 - Science :: Microorganisms: Friend and Foe

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Go To: NCERT-Science-Grade 8

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[Contributor - Anu Nived]


Objective: To teach the students about microoraganisms and how they are helpful and harmful to us

Subtopics to be covered:

- Food preservation

- Nitrogen fixation and nitrogen cycle

Learning Outcome:

- Students know about various useful and harmful microbes

- They know how viruses are different from other microbes

- They know the difference between anti bodies and anti biotics


[Contributor - Kripa S, Neelam Singh]

(Source - Bodhaguru)

https://www.youtube.com/watch?v=bY5PLLHxpbs (Hindi - Good and Bad microbes)

(Source - makemegenius)

https://www.youtube.com/watch?v=ZaFVfHftzpI (Hindi - Nitrogen Fixation and nitrogen cycle)

[Contributor - Arshea Bimal]


1. Take two pots and fill each pot half with soil. Mark them A and B. Put plant waste in pot A and things like polythene bags, empty glass bottles and broken plastic toys in pot B. Put the pots aside. Observe them after 3-4 weeks.

2. https://www.youtube.com/watch?v=4KG645qrpw8 (inflatable lungs)


[Contributor - Fathima Nazar]

Term Transliterated Term Translated Term
Algae अलगे शैवाल
Antibiotics आंटीबायोटिक्स प्रतिजैविक
Antibodies आंटीबोडीज़ प्रतिरक्षी
Bacteria बैक्टीरिया जीवाणु
Carrier कारियर वाहक
Communicable Diseases कम्युनिकेबल डिसीसेस संक्रामक रोग
Fermentation फेरमेंटशन किण्वन
Fungi फंजई कवक
Lactobacillus लैक्टोबैसिलस णु जो कार्बोहाइड्रेट के किण्वन से लैक्टिक एसिड पैदा करता है।
Microorganisms माइक्रो ऑर्गैनिसम सूक्ष्मजीव
Nitrogen Cycle नइट्रजन साइकिल नाइट्रोजन चक्र
Nitrogen Fixation नइट्रजन फिक्सेशन नाइट्रोजन स्थिरीकरण
Pasteurization पॉस्चराइज़ेशन पास्चरीकरण
Pathogen पाथजन रोगज़नक़
Preservation प्रिज़र्वेशन परिरक्षण
Protozoa प्रोटोज़ोआ एक कण जीव, एककोषीय प्रजीव
Rhizobium राइज़ोबियम एक नाइट्रोजन फिक्सिंग जीवाणु
Vaccine वाक्सिन टीका
Virus वायरस विषाणु
Yeast यीस्ट ख़मीर
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