Refer the given flowchart of sewage treatment, accordingly match Column I with Column II and select the correct answer from the codes given below Column-I Column-II A. The stage in which physical treatment of sewage is done (i) Anaerobic digestion of activated sludge and production of biogas B. The stage in which biological treatment of sewage is done (ii) Activated sludge C. Name of the sediment in primary treatment (iii) Aeration tanks D. It is carried to aeration tanks from primary settling (iv) Primary effluent E. Name of the sediment in secondary treatment (v) Primary sludge F. Site of flocs growth (vi) Secondary treatment G. Function of sludge digester (vii) Primary treatment

A - ( vii ) , B - ( vi ) , C - ( v ) , D - ( iv ) , E - ( ii ) , F - ( iii ) , G - ( i )

A - ( i ) , B - ( iii ) , C - ( v ) , D - ( vii ) , E - ( ii ) , F - ( iv ) , G - ( vi )

A - ( i ) , B - ( ii ) , C - ( iii ) , D - ( iv ) , E - ( v ) , F - ( vi ) , G - ( vii )

A - ( vii ) , B - ( vi ) , C - ( i ) , D - ( ii ) , E - ( iii ) , F - ( iv ) , G - ( v )

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Fleming, Chain, and Florey were awarded the Nobel Prize in 1945 for the discovery of

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Important Questions on Microbes in Human Welfare

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NTA Errorless Biology Volume-2>Chapter 13 - Microbes in Human Welfare>Ordinary Thinking>Q 65

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?

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NTA Errorless Biology Volume-2>Chapter 13 - Microbes in Human Welfare>Ordinary Thinking>Q 1

In the sewage treatment, bacterial flocs are allowed to sediment in a settling tank. This sediment is called

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NTA Errorless Biology Volume-2>Chapter 13 - Microbes in Human Welfare>Ordinary Thinking>Q 2

Refer the given flowchart of sewage treatment, accordingly match Column I with Column II and select the correct answer from the codes given below

Question Image

Column-I		Column-II
A.	The stage in which physical treatment of sewage is done	(i)	Anaerobic digestion of activated sludge and production of biogas
B.	The stage in which biological treatment of sewage is done	(ii)	Activated sludge
C.	Name of the sediment in primary treatment	(iii)	Aeration tanks
D.	It is carried to aeration tanks from primary settling	(iv)	Primary effluent
E.	Name of the sediment in secondary treatment	(v)	Primary sludge
F.	Site of flocs growth	(vi)	Secondary treatment
G.	Function of sludge digester	(vii)	Primary treatment

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NTA Errorless Biology Volume-2>Chapter 13 - Microbes in Human Welfare>Ordinary Thinking>Q 3

Study the following statements and select the incorrect ones.
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas commonly called gobar gas is pure methane.

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NTA Errorless Biology Volume-2>Chapter 13 - Microbes in Human Welfare>Ordinary Thinking>Q 4

Integrated Pest Management (IPM) discourages the excessive use of

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NTA Errorless Biology Volume-2>Chapter 13 - Microbes in Human Welfare>Ordinary Thinking>Q 5

The large vessels for growing microbes on an industrial scale are called

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