Tiwari Academy Discussion

Chaaya

Asked: February 25, 2021In: Class 12 Biology

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 20mg/L, 8mg/L and 400mg/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?

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 11

Chaaya

Asked: February 25, 2021In: Class 12 Biology

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

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 10

Chaaya

Asked: February 25, 2021In: Class 12 Biology

Do you think microbes can also be used as source of energy? If yes, how?

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 9

Chaaya

Asked: February 25, 2021In: Class 12 Biology

What is the key difference between primary and secondary sewage treatment?

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 8

Chaaya

Asked: February 25, 2021In: Class 12 Biology

What is sewage? In which way can sewage be harmful to us?

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 7

Chaaya

Asked: February 25, 2021In: Class 12 Biology

In which way have microbes played a major role in controlling diseases caused by harmful bacteria?

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 5

Chaaya

Asked: February 25, 2021In: Class 12 Biology

Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 4

Chaaya

Asked: February 25, 2021In: Class 12 Biology

In which food would you find lactic acid bacteria? Mention some of their useful applications.

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 3

Chaaya

Asked: February 25, 2021In: Class 12 Biology

Give examples to prove that microbes release gases during metabolism.

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 2

Chaaya

Asked: February 25, 2021In: Class 12 Biology

Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?

NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare Important Board Questions Microbes in Human Welfare NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 1

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

Do you think microbes can also be used as source of energy? If yes, how?

What is the key difference between primary and secondary sewage treatment?

What is sewage? In which way can sewage be harmful to us?

In which way have microbes played a major role in controlling diseases caused by harmful bacteria?

Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.

In which food would you find lactic acid bacteria? Mention some of their useful applications.

Give examples to prove that microbes release gases during metabolism.

Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?

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