Home
Class 12
BIOLOGY
Study the following statements and selec...

Study the following statements and select the incorrect ones
(i) Physical removeal of large and small particles through filtration and sedimentation is called primary sewage treamtent.
(ii) Secondry sewage treatment is mainly a mechanical process
(iii) Activated sludge sediment is a sewage treatement plant is a rich soruce of aerobic bactria.

A

iand ii

B

ii and iv

C

ii and iii

D

iii and iv

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Similar Questions

Explore conceptually related problems

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 aeroic bacteria. (iv) Biogas, commonly called as gobar gas, is pure methane.

Physical removal of large and small particle from the sewage through filtration and sedimentation is called

Physical removal of large and small particles from the sewage through filtration and sedimentation is done under-

The step which incolves removal of small and large particles through giltration and sedimentation. I. Primary treatement II. Secondary treatment III. Biological treatment IV. Tertiary treatment

In which of following step large and small particles are removed from sewage through sequential filtration and sedimentation?

Assertion : Secondary treatement of sewage is also called biological treatment while primary treatment is called physical treatment. Reason : Primary sewae treatment depends only upon sedimentation properies of materials present in sewage and filtration.

Read the following statements and select the incorrect one. (i) In reparative regeneration several body parts can develop e.g. broken tail of wall lizard. (ii) Fragmentation occurs in algae and bryophytes only. (iii) Exogenous budding occurs in certain annelids and urochordates. (iv) A small shoot of plant with superior characters is called scion or graft.

Study the following statements and select the incorrect ones. (i) 'Bt' in 'Bt cotton' indicates that it is a genetically modified crop produced through biotechnology (ii) The anticoagulant 'hirudin' is being produced from transgenic Brassica napus seeds (iii) 'Flavr Savr' transgenic tomatoes remain fresh for a longer period than the normal tomato variety (iv) Golden rice is a transgenic variety of Oryza sativa, which is rich in beta -carotene and helps to prevent night blindness.

Study the following statements regarding recombinant DNA technology and select the incorrect ones. (i) Taq polymerase extends the primers using the nucleotides provided in the reaction. (ii) Antibiotic resistance genes are considered as desirable genes in recombinant DNA technology. (iii) DNA fragments are separated according to their charge only, in agarose gel electrophoresis. (iv) Transformation is a procedure through which a piece of DNA is integrated in to the genome of a host bacterium. (v) To produce higher yields of a desired protein, host cells can be multiplied in a continuous culture. (vi) Downstream processing is one of the steps of polymerase chain reaction.

Given below are the steps involved in sewage treatment. Arrange them in proper sequence and select the correct option. A. Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air. B. Passage of secondary effluent and formation of activated sludge. C. Physical removal of particles through filtration and sedimentation D. Release of effluent from the secondary treatment plant into natural water bodies. E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.