Description : 10.Biomagnification of DDT in an aquatic food chain staring from water having conc.of 0.003ppb may go in fish eating birds upto (a)2ppm (b)25ppm (c)50ppm (d)100ppm
Last Answer : ANS.(B) 25ppm
Description : DDT residues are rapidly passed through food chain causing biomagnification because DDT is (a) moderately toxic (b) non-toxic to aquatic animals (c) water soluble (d) lipo soluble.
Last Answer : (d) lipo soluble.
Description : Find the correct order of biomagnification of DDT in an aquatic food chain:
Last Answer : Find the correct order of biomagnification of DDT in an aquatic food chain: A. Water -0.003 ppm, zooplankton ... fish -0.04 ppm, large fish -2.5 ppm
Description : The highest DDT concentration in aquatic food chain shall occur in:
Last Answer : The highest DDT concentration in aquatic food chain shall occur in: A. Phytoplankton B. Sea gull/birds C. Crab D. Eel
Description : The highest DDT concentration in aquatic food chain shall occur in (a) phytoplankton (b) seagull (c) crab (d) eel.
Last Answer : (b) seagull
Last Answer : b) seagull
Description : DDT residues are rapidly passed through food chain causing biomagnification because DDT is
Last Answer : DDT residues are rapidly passed through food chain causing biomagnification because DDT is A. Water ... C. Liposoluble D. Nontoxic to aquatic animals
Last Answer : DDT residues are rapidly passed through food chain causing biomagnification because DDT is A. Water ... toxic D. Non-toxic to aquatic animals
Description : Pheretima posthuma is highly useful as (a) their burrows make the soil loose (b) they make the soil porous, leave their castings and take organic debris in the soil (c) they are used as fish meal (d) they kill the birds due to biomagnification of chlorinated hydrocarbons.
Last Answer : (b) they make the soil porous, leave their castings and take organic debris in the soil
Description : The concentration of DDT in the food chain, from lower to higher trophic levels:
Last Answer : The concentration of DDT in the food chain, from lower to higher trophic levels: A. ... Decreases C. Increases or decreases D. Remains constant
Last Answer : The concentration of DDT in the food chain, from lower to higher trophic levels: A. Remain same B. Decreases in glaciers C. Increases D. Unpredictable
Description : Biomagnification of DDT causes decline in bird population by:
Last Answer : Biomagnification of DDT causes decline in bird population by: A. Bringing disturbance in calcium methabolism ... breaking of eggs D. All the above
Description : Assertion: Biomagnification of DDT can enhance the decline in bird population. Reason: DDT causes thinning of egg shell and their premature breaking b
Last Answer : Assertion: Biomagnification of DDT can enhance the decline in bird population. Reason: DDT causes thinning of ... and Reason are false, then mark (4).
Description : A river with an inflow of domestic sewage rich in organic waste may result in (a) an increased production of fish due to biodegradable nutrients (b) death of fish due to lack of oxygen ( ... of the river very soon due to algal bloom (d) increased population of aquatic food web organisms.
Last Answer : (d) increased population of aquatic food web organisms.
Description : A river with an inflow of domestic sewage rich in organic waste may result in (a) an increased production of fish due to biodegradable nutrients (b) death of fish due to lack of oxygen (c) drying of the river very soon due to algal bloom (d) increased population of aquatic food web organisms.
Last Answer : (b) death of fish due to lack of oxygen
Description : Increase in concentration of the toxicant at successive trophic levels is known as (a) biotransformation (b) biogeochemical cycling (c) biomagnification (d) biodeterioration.
Last Answer : (c) biomagnification
Description : Biomagnification means increase in the (A) concentration of pollutants in living organisms (B) number of species (C) size of living organisms (D) biomass
Last Answer : (A) concentration of pollutants in living organisms
Description : How do I convert ppb ozone with a molecular weight of 48 to ug/m3 assuming STP?
Last Answer : You lost me at ppb. Sorry
Description : Minimum acceptable level of aflatoxins B1 in poultry feed is C A. 100 ppb B. 300 ppb C. 20 ppb D. None of the these
Last Answer : 20 ppb
Description : A lake which is rich in organic waste may result in (a) increased population of aquatic organisms due to minerals (b) drying of the lake due to algal bloom (c) increased population of fish due to lots of nutrients (d) mortality of fish due to lack of oxygen.
Last Answer : (d) mortality of fish due to lack of oxygen.
Description : In an area where DDT had been used extensively, the population of birds declined significantly because:
Last Answer : In an area where DDT had been used extensively, the population of birds declined significantly because: A. ... birds D. Many bird eggs did not hatch.
Last Answer : In an area where DDT had been used extensively, the population of birds declined significantly ... eggs D. Earthworms in the area got eradicated
Description : Maximum DDT is present in birds feeding on
Last Answer : Maximum DDT is present in birds feeding on A. Fishes B. Meat C. Insects D. Seeds
Last Answer : In an area where DDT had been used extensively, the population of birds declined significantly because: ... did not hatch D. Birds stopped laying eggs
Description : In an area where DDT had been used extensively, the population of birds declined significantly because (a) birds stopped laying eggs (b) earthworms in the area got eradicated (c) cobras were feeding exclusively on birds (d) many of the birds eggs laid, did not hatch.
Last Answer : (d) many of the birds eggs laid, did not hatch.
Description : In an area where DDT had been used extensively, the population of birds declined significantly because (a) birds stopped laying eggs (b) earthworms in the area got eradicated (c) cobras were feeding exclusively on birds (d) many of the birds eggs laid, did not hatch
Description : 74. In an area where DDT had been used extensively, the population of birds declined significantly because (1) Many of the birds eggs laid, did not hatch (2) Birds stopped laying eggs (3) Earthworms in the area got eradicated (4) Cobras were feeding exclusively on birds
Last Answer : Cobras were feeding exclusively on birds
Description : A major cause of mortality of many birds visitors of aquatic habitat is
Last Answer : A major cause of mortality of many birds visitors of aquatic habitat is A. Nutrient enrichment B. Lead poisoning C. Salt enrichment D. All the above
Description : Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre. (A) 22 (B) 42 (C) 332 (D) 1050
Last Answer : (B) 42
Description : The concentration of DDT is the highest in
Last Answer : The concentration of DDT is the highest in A. Primary consumer B. Producers C. Top consumer D. Decomposers
Description : If a lake is contaminated with DDt, its highest concentration would be found in-
Last Answer : If a lake is contaminated with DDt, its highest concentration would be found in- A. Primary ... consumer C. Tertiary consumer D. None of these
Description : What is the significant figures of 0.003?
Last Answer : What is the answer ?
Description : What is 0.003 21 in words?
Last Answer : Need answer
Description : Is .003 seconds faster than 0.02 seconds?
Last Answer : .003 is faster than .005
Description : The specific gravity of urine normally ranges from (A) 0.900–0.999 (B) 1.003–1.030 (C) 1.000–1.001 (D) 1.101–1.120
Last Answer : B
Description : The probability thata singlebit will be inerror on a typical public telephone lineusing 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error ratefor a communicationline using 9-bit frames is ... to A. 0.003 B. 0.009 C. 0.991 D. 0.999 E. None of the above
Last Answer : 0.009
Description : What is the value of Fanning friction factor f ' for smooth pipe at NRe = 10 6 approximately? (A) 0.003 (B) 0.01 (C) 0.1 (D) 0.3
Last Answer : (A) 0.003
Description : If a solid shaft (diameter 20 cm, length 400 cm, N = 0.8 × 105 N/mm2 ) when subjected to a twisting moment, produces maximum shear stress of 50 N/mm2 , the angle of twist in radians, is (A) 0.001 (B) 0.002 (C) 0.0025 (D) 0.003
Last Answer : (C) 0.0025
Description : According to Bazin's formula, the discharge over a rectangular weir is mL2g x H 3/2where m is equal to (A) 0.405 + (0.003/H) (B) 0.003 + (0.405/H) (C) 0.405 + (H/0.003) (D) 0.003 + (H/0.405)
Last Answer : Answer: Option A
Description : Approximate value of shrinkage strain in concrete, is (A) 0.003 (B) 0.0003 (C) 0.00003 (D) 0.0
Last Answer : Answer: Option B
Description : 0.003 × ? × 0.0003 = 0.00009 a) 10 b) 3 c) 0.03 d) 0.003 e) None of these
Last Answer : ? = 0.00009 / 0.003 × 0.0003 = 100 Answer: e)
Description : The shrinkage strain of concrete is generally taken as [ A ] 0.3 [ B ] 0.03 [ C ] 0.003 [ D ] 0.0003
Last Answer : [ D ] 0.0003
Description : The time of closing the cycle, in modern circuit breakers is (a) 0.003 sec (b) 0.001 sec (c) 0.01 sec (d) 0.10 sec (e) none of the above
Last Answer : (a) 0.003 sec
Description : A cantilever of length 2m carries a point load of 30KN at the free end.If I = 108 mm4 and E= 2×105 N/mm2. What is the slope of the cantilever at the free end? a.0.503 rad b.0.677 rad c. 0.003 rad d.0.008
Last Answer : c. 0.003 rad
Description : Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these
Last Answer : Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these
Last Answer : Sea fish are high in iodine