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Organisms And The Environment Mcq
Quiz 8
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Q.1
Both hydrarch and xerarch succession lead to .... .... [C.B.S.E. 2011]
0%
a) Medium water conditions
0%
b) Excessive wet conditions
0%
c) Xeric conditions
0%
d) Highly dry conditions
Explanation
Answer : (a)
Q.2
Abundance of species population within its habitat is .... .... [A.I.I.M.S.2002]
0%
a) Absolute density
0%
b)Regional density
0%
c) Relative density
0%
d) Niche density
Explanation
Answer : (d)
Q.3
An example of mutualism is .... .... [Bih.P.M.T. 1996]
0%
a) Riccia
0%
b) Selaginella
0%
c) Lichen
0%
d) Spirogyra
Explanation
Answer : (c)
Q.4
Which is not characteristic of intestinal symbionts? .... .... [C.E.T.Chd2000]
0%
a) Feeding on extra food for host
0%
b) Providing vitamins to host
0%
c) Anaerobic respiration
0%
d) Aerobic respiration
Explanation
Answer:(c)
Q.5
The size of clay particles is .... ..... [ DPMT 2008]
0%
a) Less than 0.002 mm
0%
b) More than 0.002 mm
0%
c) 0.2 mm to 2 mm
0%
d) None of the above
Explanation
Answer : (a)
Q.6
Birth rate is 100, death rate isNumbers of individual in population group isWhat is the percentage of natural growth rate? .... .... [Guj.C.E.T.2006]
0%
a) 0.09%
0%
b) 9.0%
0%
c) 0.9%
0%
d) 90%
Explanation
Answer : (b)
Q.7
Which of the following is wrongly matched? .... .... [Kerala 2005]
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a) Temperature zone 20 - 40 latitude
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b) Hypolimnion - Thermal stratification in lakes
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c) Ozone layer - Stratosphere
0%
d) Profundal zone - Dark zone
Explanation
Answer : (a)
Q.8
The factor related to structure of earth surface is ..... .... [B.H.U.1995]
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a) Edaphic
0%
b) Biotic
0%
c) Temperature
0%
d) Topographic
Explanation
Answer : (d)
Q.9
Stronger homeostasis in an ecosystem refers to .... .... [C.E.T.Chd2009]
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a) self regulatory mechanism
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b) Feed back mechanism
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c) Influence of productivity
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d) State of equilibrium
Explanation
Answer : (d)
Q.10
What does the following sequences represent: Blue → Green algae → Crustose→ Lichens → Foliose lichens → Mosses → Shrubs → Dicotyledonous trees? [C.P.M.T. 1989]
0%
a) A food pyramid
0%
b) Ecological succession
0%
c) Genetic drift
0%
d) Phylogenetic trend
Explanation
Answer : (b)
Q.11
Carrying capacity is determined by .... .... [Odisha 2009]
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a) Limiting resources
0%
b) Mortality rate
0%
c) Natality rate
0%
d) Predation
Explanation
Answer : (a)
Q.12
Keystone species is .... .. [ AIIIMS 2007]
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a) Always dominant
0%
b) Useful in maintain structure and function of biotic community
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c) With maximum biomass
0%
d) All the above
Explanation
Answer : (b)
Q.13
Plants and animals living in a particular area constitute .... .... [C.P.M.T. 1998]
0%
a) Flora and fauna
0%
b) Community
0%
c) Ecosystem
0%
d) Ecology
Explanation
Answer : (b)
Q.14
Plants obtaining nourishment from other plants by haustoria are .... .... [Har.PM.T. 1998]
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a) Epiphytes
0%
b) Parasites
0%
c) Xerophytes
0%
d) Halophytes
Explanation
Answer : (b)
Q.15
Maximum survival and reproductive capacity shown by a population under optimal conditions is .... ..... [J.K.C.M.E.E. 2011]
0%
a) Carrying capacity
0%
b) Natality
0%
c) Biotic potential
0%
d) Vitality
Explanation
Answer : (d)
Q.16
Rhizosphere microflora exhibits ..... ..... [C.E.T.Chd 2010]
0%
a) Symbiosis
0%
b) Parasitism
0%
c) Commensalism
0%
d) Space parasitism
Explanation
Answer : (a)
Q.17
Under unfavorable conditions many zooplankton species in lakes and ponds enters .... .... [H.P.P.M.T. 2010,2011]
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a) Diapause
0%
b) Hibernation
0%
c) Aestivation
0%
d) None of the above
Explanation
Answer:(a)
Q.18
Which is most correctly matched .... .... [C.B.S.E.2004]
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a) Laterite - Contains aluminium
0%
b) Terra rosa - Most suitable for roses
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c) Chernozem - Richest soil
0%
d) Black cotton soil - rich in calcium carbonate
Explanation
Answer : (b)
Q.19
Two different types of plant species living together at a place .... .... [R.P.M.T. 2002]
0%
a) Plantcoenosis
0%
b) Zoocoenosis
0%
c) Plant community
0%
d) Ecotype
Explanation
Answer : (c)
Q.20
Aerenchyma occurs in .... ..... [Odisha 2009]
0%
a) Epiphytes
0%
b) Halophytes
0%
c) Hydrophytes
0%
d) Xerophytes
Explanation
Answer : (c)
Q.21
Which gas of the atmosphere holds up ultraviolent rays .... .... [C.P.M.T.1994]
0%
a) O2
0%
b) O3
0%
c) N2
0%
d) CO2
Explanation
Answer : (b)
Q.22
The correct order of succession is xerarch is .... .... [Kerala 2006]
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a) Annual herbs stage, perennial herbs stage, lichen moss stage, scrub stage, forest
0%
b) Perennial herbs stage, annual herbs stage, lichen moss stage, scrub stage. forest
0%
c) Lichen moss stage, annual herbs stage, perennial herbs stage, scrub stage, forest
0%
d) Forest, scrub stage, annual herbs stage, perennial herbs stage, lichen moss stage
Explanation
Answer:(c)
Q.23
Edaphology is connected with .... .... [D.P.M.T.1999]
0%
a) Plant and biosphere
0%
b) Soil and living micro-organisms
0%
c) Animals and ecosystem
0%
d) Soil and biosphere
Explanation
Answer : (b)
Q.24
Fresh water bony fishes maintain water balance by .... ..... [B.H.U.2012]
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a) Excreting hypotonic urine.
0%
b) Excreting wastes as uric acid.
0%
c) Drinking small amount of water.
0%
d) Excreting salt across their gills.
Explanation
Answer : (a)
Q.25
Sun loving plants are .... .... [C.P.M.T.1998]
0%
a) Halophytes
0%
b) Sciophytes
0%
c) Heliophytes
0%
d) Autotrophs
Explanation
Answer : (c)
Q.26
Transition zone between two communities is .... .... [C.P.M.T. 2001]
0%
a) Ecotone
0%
b) Ecad
0%
c) Ecotype
0%
d) Keystone
Explanation
Answer : (a)
Q.27
Percentage ratio of natality over mortality is .... .... [Pb.P.M.T. 2007]
0%
a) Population dynamics
0%
b) Vital index
0%
c) Population density
0%
d) Total count
Explanation
Answer : (b)
Q.28
Instrument used for measuring wind velocity is .... .... [M.P.P.M.T.2004]
0%
a) Anemometer
0%
b) Hydrometer
0%
c) Lactometer
0%
d) Photometer
Explanation
Answer : (a)
Q.29
Clay particles are .... .... [E.A.M.C.E.T.2002]
0%
a) Positively charged
0%
b) Negatively charged
0%
c) Electrically neutral
0%
d) Without any charge
Explanation
Answer : (b)
Q.30
Microscopic aquatic organisms lacking locomotory ability and drifting with water current are .... .... [A.M.U. 2010]
0%
a) Pleuston
0%
b) Nekton
0%
c) Plankton
0%
d) Seston
Explanation
Answer : (c)
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