Exam (elaborations)
NCERT Solutions for Class 12 Biology Chapter 10
NCERT Solutions for Class 12 Biology Chapter 10
[Show more]
Content preview
UM NIT II:
UNIT II: SSTRUCTURAL
ICROBES TRUCTURAL O
IN HUMAN W
ORGANISATION IN P
RGANISATION IN
ELFARE PLANTS AND A
LANTS AND ANIMAL
NIMALS 69
CHAPTER 10
MICROBES IN HUMAN WELFARE
MULTIPLE-CHOICE QUESTIONS
1. The vitamin whose content increases following the conversion of milk
into curd by lactic acid bacteria is:
a. vitamin C
b. vitamin D
c. vitamin B12
d. vitamin E.
2. Wastewater treatment generates a large quantity of sludge, which can
be treated by:
a. digesters
b. activated sludge
c. chemicals
d. oxidation pond.
3. Methanogenic bacteria are not found in:
a. rumen of cattle
b. gobar gas plant
c. bottom of water-logged paddy fields
d. activated sludge.
4. Match the following list of bacteria and their commercially important
products:
Bacterium Product
(i) Aspergillus niger (a) Lactic acid
(ii) Acetobacter aceti (b) Butyric acid
(iii) Clostridium butylicum (c) Acetic acid
(iv) Lactobacillus (d) Citric acid
Choose the correct match:
a. i b, ii c, iii d, iv a
b. i b, ii d, iii c, iv a
, 70 BIOLOGY, EXEMPLAR PROBLEMS
c. i d, ii c, iii b, iv a
d. i d, ii a, iii c, iv b
5. Match the following list of bioactive substances and their roles:
Bioactive Substance Role
(i) Statin (a) Removal of oil stains
(ii) Cyclosporin A (b) Removal of clots from blood vessels
(iii) Streptokinase (c) Lowering of blood cholesterol
(iv) Lipase (d) Immuno-suppressive agent
Choose the correct match:
a. i b, ii c, iii a, iv d
b. i d, ii b, iii a, iv c
c. i d, ii a, iii d, iv c
d. i c, ii d, iii b, iv a
6. The primary treatment of waste water involves the removal of:
a. dissolved impurities
b. stable particles
c. toxic substances
d. harmful bacteria.
7. BOD of waste water is estimated by measuring the amount of:
a. total organic matter
b. biodegradable organic matter
c. oxygen evolution
d. oxygen consumption.
8. Which one of the following alcoholic drinks is produced without distillation?
a. Wine
b. Whisky
c. Rum
d. Brandy
9. The technology of biogas production from cow dung was developed in
India largely due to the efforts of:
a. Gas Authority of India
b. Oil and Natural Gas Commission
c. Indian Agricultural Research Institute and Khadi & Village
Industries Commission
d. Indian Oil Corporation.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Hkane. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.55. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now