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Microbes in Human Welfare

Three water samples namely river water, untreated sewage water

Biology

Class 12

NCERT

Chapter 1: Reproduction in Organisms

18 questions

Chapter 2: Sexual Reproduction in Flowering Plants

18 questions

Chapter 3: Human Reproduction

21 questions

Chapter 4: Reproductive Health

12 questions

Chapter 5: Principles of Inheritance and Variation

16 questions

Chapter 6: Molecular Basis of Inheritance

14 questions

Chapter 7: Evolution

10 questions

Chapter 8: Human Health and Disease

17 questions

Chapter 9: Strategies for Enhancement in Food Production

12 questions

Chapter 10: Microbes in Human Welfare

15 questions

Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.

Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as

20 m g / L

8 m g / L

and

400 m g / L

, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

Find out the name of the microbes from which Cyclosporin A(an immunosuppressive drug) and Statins (blood chloestrol lowering agents) are obtained.

View all question

Chapter 11: Biotechnology: Principles and Processes

12 questions

Chapter 12: Biotechnology and its Applications

10 questions

Chapter 13: Organisms and Populations

17 questions

Chapter 14: Ecosystem

13 questions

Chapter 15: Biodiversity and Conservation

10 questions

Chapter 16: Environmental Issues

11 questions

Question

Easy

Solving time: 5 mins

Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as $20 m g / L$ , $8 m g / L$ and $400 m g / L$ , respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

Uploaded: 2022-05-03T16:17:32.000Z
Duration: 4 min

Views: 5,929 students

Updated on: May 3, 2022

Book:

Biology (NCERT)

Found 4 tutors discussing this question

Alexander Discussed

20 m g / L

8 m g / L

and

400 m g / L

, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

5 mins ago

Discuss this question LIVE

5 mins ago

Text solutionVerified

The presence of organic matter increases the microbe population which in turn increase the BOD i.e. BOD is direct measure of pollution. Among the given samples, river water is most pure one and will have minimum BOD (8 mg/L) while untreated sewage water is richest in organic waste and will exhibit highest BOD (400 mg/L). Part of organic waste is removed by sewage treatment and secondary effluent has BOD of 20mg/L. The given samples in increasing the order of pollutants are river water (B) <secondary effluent (A)< untreated sewage water (C).

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Practice more questions from Biology (NCERT)

Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.

20 m g / L

8 m g / L

and

400 m g / L

, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

Find out the name of the microbes from which Cyclosporin A(an immunosuppressive drug) and Statins (blood chloestrol lowering agents) are obtained.

View all

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Question Text	Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as $20 m g / L$ , $8 m g / L$ and $400 m g / L$ , respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?
Updated On	May 3, 2022
Topic	Microbes in Human Welfare
Subject	Biology
Class	Class 12
Answer Type	Text solution:1 Video solution: 2
Upvotes	228
Avg. Video Duration	11 min

Text solutionVerified

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