12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 05/11/2020
12th Standard Zoology - Microbes in Human Welfare English Medium Free Online Test One Mark Questions 2020 - 2021
Download Tamil Nadu 12th Standard Biology 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 Biology Test1.
Name the person who was the first to use the term antibiotic
Selman Waksman
Alexander Flemming
Earnest Chain
Howard Florey
2.
Match, the following list of microbes and their importance:
| a) Saccharomyces cerevisiae | (i) Production of immunosuppressive agents |
| b) Monasus purpureus | (ii) Ripening of Swiss cheese |
| c) Trichoderma polysporum | (iii) Commercial production of ethonol |
| d) ropionibacterium shermanii | (iv) Production of blood - cholesterol lowering agents. |
(iv) (iii) (ii) (i)
(iv) (ii) (i) (iii)
(iii) (i) (iv) (ii)
(iii) (iv) (i) (ii)
3.
During sewage treatment, biogas are produced which includes
Methane, hydrogen sulphide, carbon dioxide
Methane, oxygen, hydrogen sulphide
Hydrogen sulphide, methane, sulphur dioxide
Hydrogen sulphide, nitrogen, methane
4.
Plants used for bio-diesel production________
Anabaena
Jatropha
Pongamia
b and c
5.
_________is used for recycling of PET plastics
Dechloromonas aromatica
Phanerochaete chrysosporium
Ideonella sakaiensis
Nitrosomonas
6.
Lactobacillus helps to produce________
Citric acid
Milk
Acetic acid
Butyric acid
7.
The enzyme________is got from Aspergillus.
Rennet
Zymase
Amylase
Lipase
8.
The purpose of biological treatment of waste water is to _______
Reduce BOD
Increase BOD
Reduce sedimentation
Increase sedimentation
9.
Which of the following is not involved in nitrogen fixation?
Pseudomonas
Azotobacter
Anabaena
Nostac
10.
1.
(a)
Selman Waksman
2.
(d)
(iii) (iv) (i) (ii)
3.
(a)
Methane, hydrogen sulphide, carbon dioxide
4.
(d)
b and c
5.
(c)
Ideonella sakaiensis
6.
(a)
Citric acid
7.
(c)
Amylase
8.
(a)
Reduce BOD
9.
(a)
Pseudomonas
10.
(c)
12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications களப்பெயர் முறைமை (DNS) Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications வலையமைப்பு எடுத்துக்காட்டுகள் மற்றும் நெறிமுறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications கணினி வலையமைப்பு ஓர் அறிமுகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications PHP-உடன் MySQL-ஐ இணைத்தல் Sample Question Papers Study Material - QB365 Set A
Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
English
French
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