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51.

Thermocline is a constituent ofA. EpilimnionB. MetalimnionC. HypolimnionD. None of the above.

Answer» Correct Answer - B
52.

Hypolimnion of a deep takeA. Freees during cold winterB. Warms up during hot summerC. Remains cool throughoutD. Remins warm throughout.

Answer» Correct Answer - C
53.

Wild beasts of Africa migrate in response toA. Excessive heatB. Cold freezing temperatureC. RainfallD. Overpopulaion.

Answer» Correct Answer - C
54.

Which of the following soil is transported by air?A. AlluvialB. ColluvialC. GlacialD. Eolian

Answer» Correct Answer - D
55.

Adaptations is an organism are meant forA. Optimun primary productionB. Optimum mobilityC. Optimum mobilityD. Optimum survival and reproduction.

Answer» Correct Answer - D
56.

Benthic organism are affected most byA. Surface turbulance of waterB. Sediment characteristicsC. Water holding capacity of soilD. Light reaching the forest floor.

Answer» Correct Answer - D
57.

Which one of the following is not an edaphic factor?A. Mineral matterB. Organic matterC. RainfallD. Soil water.

Answer» Correct Answer - C
58.

Which one is nearly absent in ozonosphere ?A. Dust particlesB. Water vapoursC. `CO_(2)`D. All the above.

Answer» Correct Answer - D
59.

Ozonosphere occurs at a height osA. 8-10 km above polesB. 8-10 km above equatorC. 11-16 km above polesD. 11-16 km above equator.

Answer» Correct Answer - C
60.

Winters are absent in climatic zoneA. SubtropicalB. TropicalC. AlpineD. Arctic.

Answer» Correct Answer - B
61.

Components of environment areA. BioticB. AbioticC. Resource and regulatory factorsD. All the above.

Answer» Correct Answer - D
62.

Climatic zone between `20^(@)-40^(@)` isA. SubtropicalB. TemperateC. Both A and BD. Temperate and subarctic.

Answer» Correct Answer - A
63.

Tropical zone extends fromA. `0^(@)-30^(@)`B. `0^(@)-20^(@)`C. `10^(@)-23^(@)`D. `5^(@)-30^(@)`

Answer» Correct Answer - B
64.

Mean annual temperature of tropical zone isA. `10^(@)C`B. `16^(@)C`C. `24^(@)C`D. `30^(@)C`

Answer» Correct Answer - C
65.

Good soil isA. Allows water to percolate slowlyB. Allows water to pass quicklyC. Allows limited amount of water into itD. Holds whole of water entring it.

Answer» Correct Answer - A
66.

The least porous soil among the following is a:A. Clay soilB. Sandy soilC. Loam soilD. Gravelly soil

Answer» Correct Answer - A
67.

Hibernation occurring in certain animals isA. OccasionalB. IntermittentC. RhythmicD. Periodic.

Answer» Correct Answer - D
68.

Plants growing in oligotrophic forest soils usually haveA. MycorrhizaB. Slow growthC. Reduced growthD. All of the above.

Answer» Correct Answer - A
69.

Palisade parenchyma is well developed inA. MesophytesB. HeliophytesC. SciophytesD. Hygropohytes.

Answer» Correct Answer - B
70.

Rate of photosyntheiss is maximum atA. EquatorB. Tropic of CancerC. Tropic of CapricornD. Arctic circle.

Answer» Correct Answer - A
71.

Animals active at dawn areA. AuroralB. VesperalC. CrepuscularD. Diurnal.

Answer» Correct Answer - A
72.

Animals exposed to bright light haveA. Darker pigmentationB. Lighter pigmentationC. Tint of yellow and red coloursD. Both A anc C.

Answer» Correct Answer - B
73.

Almost decomposed organic matter in which original matter in which original form if lost is inA. DuffB. LitterC. Leaf mouldD. None of these.

Answer» Correct Answer - C
74.

Humus is defined asA. Physical texture of soilB. Chemical composition of soilC. Decomposed organic matter in soilD. None of these

Answer» Correct Answer - C
75.

Formation of soil takes place byA. WeatheringB. PedogenesisC. MeltingD. Both A and B.

Answer» Correct Answer - D
76.

Formation of organic matter takes place byA. Chemical weatheringB. Soil micro-organismsC. HerbivoresD. Soil water.

Answer» Correct Answer - B
77.

Xeric environment is characterised byA. PrecipitationB. Low atmospheric humidityC. Extremes of temperatureD. High rate of vaporisation.

Answer» Correct Answer - B
78.

Shallow lakes with abundant organic matter areA. SaprotrophicB. OligotrophicC. EutrophicD. Heterotrophic.

Answer» Correct Answer - C
79.

Ionosphere occurs inA. ThermosphereB. HomosphereC. MesosphereD. Stratosphere.

Answer» Correct Answer - A
80.

In thermonsphere the temperatureA. Rises with height to `200^(@)C`B. Rises with height to `1500^(@)C`C. First decreases then risesD. Decreases to `-150^(@)C`.

Answer» Correct Answer - B
81.

The most common organic solute stored by xerophytes for maintaining osmotic and water potential isA. GlucoseB. SucroseC. RaffinoseD. Proline.

Answer» Correct Answer - D
82.

Organisms capable of maintaining constant body temperature are:A. StenothermalB. ConformersC. PoikilothermalD. Homoiothermal

Answer» Correct Answer - D
83.

Solar radiations reaching earth have a wavelength ofA. 400-700 nmB. 300-740 nmC. 300-2600 nmD. 300-16000 nm

Answer» Correct Answer - C
84.

Solar spectrum containsA. X-rays and cosmic raysB. Ultraviolet rays and infrared raysC. RadiowavesD. All the above.

Answer» Correct Answer - D
85.

A continuous system of air passages from aerial leaves to anchored roots is found inA. Submerged hydrogphytesB. Floating hydrophytesC. Emergent hydrophytesD. Suspended hydrophytes..

Answer» Correct Answer - C
86.

In mesophere, the temperatureA. Rises from `-2^(@)` to `15^(@)C`B. Rises from `-2^(@)` to `92^(@)C`C. Decreases from `-2^(@)` to `-15^(@)C`D. Decreases from `-2^(@)` to `-92^(@)C`.

Answer» Correct Answer - D
87.

Transitional layer between stratosphere and mesosphere isA. TroposphereB. LithosphereC. StratopauseD. Traopoapause

Answer» Correct Answer - C
88.

Mesophere is component ofA. AtmosphereB. HydrosphereC. LithosphereD. Asthenosphere.

Answer» Correct Answer - A
89.

Ozone makes the stratosphereA. Coolar by `17^(@)C`B. Warmer by `17^(@)C`C. Warmer by `55^(@)C`.D.

Answer» Correct Answer - C
90.

Ozonosphere is component ofA. TroposphereB. StratosphereC. MesosphereD. Thermosphere.

Answer» Correct Answer - B
91.

Succulents occur inA. DesertsB. TundraC. Temperate deciduous forestsD. Tropical rain forests.

Answer» Correct Answer - A
92.

Succulents performA. `C_(4)` photosynthesisB. CAMC. `C_(3)` photosynthesisD. All the above.

Answer» Correct Answer - B
93.

In deep fresh water ponds, different layers of water with different temperatures are noticed,This is known asA. Thermal stratificationB. Surface tensionC. Water equilibriumD. Thermal equilibrium.

Answer» Correct Answer - A
94.

A phreatophyte isA. CapparisB. EuphorbiaC. TamarixD. Gnaphalium.

Answer» Correct Answer - C
95.

Deep roots occur inA. Perennial nonsucculent xerophytesB. Perennial succulent xerophytesC. Annual xerophytesD. Ephemeral xerophytes

Answer» Correct Answer - A
96.

Phreatophytes are xerophytes with rootsA. Spread along the soil surfaceB. Well spread in the soilC. Very deep reaching ground water fringeD. Very deep but well above ground water.

Answer» Correct Answer - C
97.

Profundal zone isA. Aphotic zone in deep waterB. Euphotic zone in open waterC. Disphotic zone in deep waterD. Dark bottom of deep water body.

Answer» Correct Answer - A
98.

A zone of gradual change in temperature of a lake isA. HypolimnionB. EpilimnionC. ThermoclineD. None of the above.

Answer» Correct Answer - C
99.

Open water zone in a deep lake/sea is calledA. Littoral zoneB. Limnetic zoneC. Profundal zoneD. Disphotic zone.

Answer» Correct Answer - B
100.

Organisms are present but they do reproduce in the zone ofA. Optimum toleranceB. IntoleranceC. StressD. Beyond upper and lower limit of tolerance.

Answer» Correct Answer - C