Cobras were feeding exclusively on birds. d) Many of the birds eggs, laid, did not hatch. . Measuring Biochemical Oxygen Demand (BOD) is a method used for [AIPMT PRE- ] a) Estimating the amount of organic matter in sewage water.
b) Working out the efficiency of oil driven automobile engines. c) Measuring the activity of saccharomyces cerevisiae in producing curd on a commercial scales d) Working out the efficiency of RBCs about their capacity to carry oxygen . A scrubber in the exhaust of a chemical industrial plant removes a) Gases like sulphur dioxide. b) Particulate matter of the size micrometer or above.
c) Gases like ozone and methane d) Particulate matter of the size . micrometer or less . Rachel Carson’s famous book ‘Silent Spring’ is related to [AIPMT- ] a) Pesticide pollution b) Noise Pollution c) Population explosion d) Ecosystem management . Increase in the concentration of the toxicant at successive trophic levels is known as [RE AIPMT- ] a) Biodeterioration b) Biotransformation c) Biogeochemical cycling d) Biomagnification .
A river with an inflow of domestic sewage rich in organic waste may result in: [NEET-I, ] a) Drying of the river very soon due to algal bloom b) Increased population of aquatic food web organisms c) An increased production of fish due to biodegradable nutrients d) Death of fish due to lack of oxygen . A lake which is rich in organic waste may result in [NEET-II, ] a) Drying of the lake due to algal bloom b) Increased population of fish due to lots of nutrients c) Mortality of fish due to lack of oxygen d) Increases population of aquatic organisms due to minerals . The highest DDT concentration in aquatic food chain shall occur in [NEET-II, ] a) Seagull b) Crab c) Cell d) Phytoplankton XII Std Biology-Zoology Competitive Questions XII Std Biology-Zoology Competitive Questions