Water in a lake made acidic by acid rain or mine drainage is often clear eutroph
ID: 492628 • Letter: W
Question
Water in a lake made acidic by acid rain or mine drainage is often clear eutrophic rich in game fish rich in lime Dissolved oxygen (DO) in water is important because a low Do level can affect light penetration phosphate concentration salt level (salinity) survival of aquatic animals The biochemical oxygen demand (BOD) of a water sample indicates the dissolved oxygen level organic matter level phosphate level salt levels (salinity) Anaerobic oxidation produces CO _2, H _2O, and inorganic ions CO, NH _3, and H _2O CH_4, NH _3, and H _2S sewage sludge Excess nitrates or phosphates in a lake or river cause aerobic decay eutrophication an increase in game fish nitrogen fixation Which ion, from fertilizer runoff and wastewater discharges, can lead to methemoglobinemia in young children? Ca^2+ K^+ NO^-_3 PO^3-_4 Fluoridation of drinking water strengthens tooth enamel by converting hydroxyapatite to CaCO _3 CaF _2 fluorapatite fluorotartrateExplanation / Answer
30)answer is A) Clear,
because there is a less chance of eutropication,increased number of game fish is also not possible,rich in lime is also not possible.
31)answer is D)Survival of aquatic organisms,
because D.O means dissolved oxygen,it is necessary for the survival of aquatic organisms,hence if it decreases aquatic organisms struggles.
32)answer is B)Organic matter level,
Biological Oxygen Demand (BOD) is one of the most common measures of pollutant organic material in water. BOD indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water.
33)answer is C)CH4,NH3,& H2S
Anaerobic bacterias bring about petrification producing methane, hydrogen sulphide, ammonium sulphide and phosphate, which give offensive odor. This kind of oxidation of sewage is called ” Anaerobic oxidation,"
34)answer is B)Eutropication,
Eutrophication arises from the oversupply of nutrients, which leads to overgrowth of plants and algae, Elevated levels of atmospheric compounds of nitrogen can increase nitrogen availability. Phosphorus is often regarded as the main culprit in cases of eutrophication in lakes subjected to "point source" pollution from sewage pipes.
35)answer is C)NO3-
Methemoglobinemia is a condition in which more than 1% of the hemoglobin in red blood cells takes the form of methemoglobin.Known toxins that can cause methemoglobinemia include nitrates or nitrites, and, importantly, many medications.
36)answer is C)Fluorapatite,
Fluorapatite is more resistant to decay than is hydroxyapatite hence fluoridation is done.
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