Free Microbes In Human Welfare (Daily Quiz: 8) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

Pollution from animal excreta and organic waste from kitchen can be most profitably minimised by

(a) using them for producing biogas.

(b) storing them in underground storage tanks.

(c) vermiculture.

(d) using them directly as biofertilizers.

Question-2

Which one of the following helps in absorption of phosphorus from soil by plants?

(a) Frankia

(b) Rhizobium

(c) Anabaena

(d) Glomus

Question-3

Select the correct statement from the following.

(a) Biogas, commonly called gobar gas, is pure methane.

(b) Biogas is produced by the activity of aerobic bacteria on animal waste.

(c) Methanobacterium is an aerobic bacterium found in rumen of cattle.

(d) Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria

Question-4

Choose the correct option to fill in the blanks.

1. Primarytreatment of sewage involves the physical removal of small and large particles through ...A... and ...B... .
2. Microbes consume the major part of organic matter in the effluent and reduce ...C... of sewage.
3. ...D... particularly ...E... anaerobically breakdown cellulosic material and produce $CO_2$ and $H_2$ from anaerobic sludge during ...F... . treatment.
4. When the BOD of sewage has reduced, the effluent is passed into ...G... . Here, Ato G can be

(a) A–centrifugation, B–sedimentation, C–BOD, D–Methanogen, E–Methanococcus, F–biogas plant, G–sludge tank

(b) A–sedimentation, B–centrifugation, C–BOD, D–Methanogen, E–Methanobacterium, F–water gas plant, G–settling tank

(c) A–filtration, B–centrifugation, C–BOD, D–Methanogen, E–Methanobacillus, F–gobar gas plant, G–filter tank

(d) A–filtration, B–sedimentation, C–BOD, D–Methanogen, E–Methanobacterium, F–sewage treatment plant, G–settling tank

Question-5

Trichoderma harzianum has proved a useful micro-organism for

(a) reclamation of wastelands

(b) bioremediation of contaminated soils

(c) gene transfer in higher plants

(d) biological control of soil-borne plantpathogens