The excessive discharge of fertilizers into water bodies results in

Which of the following statements are correct regarding Eutrophication?
$I-$ Streams entering into a lake introduce nutrients like nitrogen and phosphorus,which encourage the growth of aquatic organisms.
$II-$ As the lake's fertility increases,plant and animal life flourish.
$III-$ Organic remains begin to deposit at the bottom of the lake.
$IV-$ Organic waste materials continue to accumulate in the lake.
$V -$ The lake becomes shallower and warmer.
$VI -$ Cold-water organisms are replaced by warm-water organisms.
$VII -$ Marsh plants take root in the shallows and begin to fill in the original lake basin.

Which one of the following is the heavy toxic metal present in waste water from industries?

Which of the following pollutants is released in the largest quantity from the exhaust emissions of petrol/diesel automobiles?

$A$ lake with an inflow of domestic sewage rich in organic waste may result in:

Which one of the following is not an air pollutant?