How much amount of impurities are present in waste water which make it unfit for human use?
(1) 0.01%
(2) 0.1%
(3) 0.2%
(4) 2%
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
Algal bloom is due to and results in:
(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
Which of the following statements is wrong?
(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
Water hyacinth
Find the odd one out
(1) Eichhornia crassipes
(2) Introduced in India for their lovely flowers
(3) Have mauve colored flowers
(4) Does not has any characteristic shape
Which of the following option is wrong about Water hyacinth?
(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
Sewage has heavy metals
(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
Biomagnification is a well known phenomenon for
(1) Mercury
(2) DDT
(3) Silver
(4) Both A and B
Concentration of DDT in water is 0.003 ppb, what can be the most commonly seen concentration of DDT in zooplankton?
(1) 4 ppb
(2) 5 ppm
(3) 0.04 ppm
(4) 2 ppm
Biomagnification of DDT in a fish eating bird can reach to
(1) 20 ppm
(2) 20 ppb
(3) 25 ppb
(4) 25 ppm