Biodegradable organic matter of domestic sewage is used as a substrate by

(1) Bacteria and Other microbes

(2) Industries

(3) Lichens

(4) All of these

(1) Directly proportional to Biodegradable organic matter

(2) Inversely proportional to Biodegradable organic matter

(3) Depends on direction of flow

(4) Directly proportional to dissolved oxygen

(1) Higher the dissolved oxygen

(2) Higher the BOD

(3) Lower the number of Bacteria

(4) All of these

(1) Presence of large amount of nutrients in water

(2) Excessive growth of free floating or planktonic algae

(3) Distinct color to the water bodies

(4) All of these

(1) Algal bloom cause deterioration of the water quality and fish mortality

(2) Some bloom forming algae are extremely toxic to human beings and animals

(3) Sewage discharge causes mortality of fish and other aquatic creatures

(4) Beautiful orange colored flowers have caused havoc in India because of their faster growth

(1) Eichhornia crassipes

(2) Introduced in India for their lovely flowers

(3) Have mauve colored flowers

(4) Does not has any characteristic shape

(1) World's most problematic weed

(2) Terror of Bengal

(3) Grow abundantly in eutrophic water bodies

(4) Maintains a balance in the ecosystem dynamics of the water body

(1) Elements with density greater than 5g /cm3

(2) Elements with density greater than 10g /cm3

(3) Elements with density greater than 15g /cm3

(4) Substances with density greater than 0.3g/cm3

(1) Biopiracy

(2) Biomagnification

(3) Biomanagement

(4) Biosystematics

(1) Mercury

(2) DDT

(3) Silver

(4) Both A and B