8th Standard Syllabus & Materials
8th Standard
Tamilnadu 8th Standard கணிதம் இயற்கணிதம் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard கணிதம் எண்கள் Important Questions And Answers Study Material - QB365 Set B
NEW8th Standard
Tamilnadu 8th Standard கணிதம் எண்கள் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
Tamilnadu 8th Standard Social Science பொருளியல் - பொது மற்றும் தனியார் துறைகள் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science குடிமையியல் - நீதித்துறை Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science குடிமையியல் - பாதுகாப்பு மற்றும் வெளியுறவுக் கொள்கை Important Questions And Answers Study Material - QB365
Published on: 13/05/2022
QB365 provides detailed and simple solution for every Book back Questions in class 8 Science Subject. It will helps to get more idea about question pattern in every book back questions with solution.
latest Book back QuestionsDownload Tamil Nadu 8th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Why micro organisms are essential for agriculture?
2.
How diseases causing micro organisms enter into human beings?
3.
What are pathogens?
4.
5.
Write the four types of bacteria, based on their shape.
1.
a) Natural fertilizer:
Micro organisms act upon degradable waste and making the soil fertile.
b) Nitrogen fixation
Rhizobium bacteria living in the root nodules of leguminous plants enrich the soil by fixing the atmospheric nitrogen as nitrates.
c) Bio control agents:
Bacillus thuringiensis control insects trichoderma protects, roots and control plant pathogens. Baculoviruses attack insects and other arthropods.
(OR)
Microorganisms make compost from degradable waste, fix the atmospheric nitrogen.
2.
Pathogens enter into the body through cuts and wounds in the skin, mouth or nose.
3.
Disease causing micro organisms are called pathogens.
Pathogenic organisms are of 5 types :
i) viruses
ii) fungi
iii) worms
iv) bacteria
v) protozoa
4.
5.
i) Bacilli - Rod shaped bacteria.
Eg. Bacillus anthracis
ii) Spirilla - Spiral shaped bacteria.
Eg. Helicobacter pylori.
iii) Cocci - Spherical or ball shaped bacteria
Eg. Streptococus pneumoniae
iv) Vibrio - Comma shaped bacteria
Eg. Vibrio cholera
8th Standard Syllabus & Materials
8th Standard
Tamilnadu 8th Standard Social Science புவியியல் - புவிப்படங்களைக் கற்றறிதல் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science புவியியல் - கண்டங்களை ஆராய்தல் (ஆப்பிரிக்கா, ஆஸ்திரேலியா மற்றும் அண்டார்டிகா) Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science புவியியல் - தொழிலகங்கள் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science வரலாறு - காலங்கள் தோறும் இந்தியப் பெண்களின் நிலை Important Questions And Answers Study Material - QB365
Tamilnadu Stateboard 8th Standard Subjects
Tamilnadu Stateboard Standards
