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Organisms And The Environment Mcq
Quiz 12
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Q.1
Each environment can support a limited population depending upon its .... ..... [Manipur 2006]
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a) Biotic potential
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b) Carrying capacity
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c) Natality
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d) Reproductive potential
Explanation
Answer : (b)
Q.2
Humus is example of .... .... [D.P.M.T.1987]
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a) A fertilizer
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b) Component of soil structure
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c) Organic colloids
0%
d) Crystalloids
Explanation
Answer : (c)
Q.3
. Stages of hydrarch are (a) Marsh meadow stage (b) Reed swamp stage (c) Submerged plant stage (d) Phytoplankton stage (e) Submerged free floating stage. Identify the correct sequence Kerala 2007
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a) d, c, e, b, a
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b) c, e, a, b, d
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c) e, c, b, a, d
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d) d, e, c, b, a
Explanation
Answer : (a)
Q.4
Match the columns and find the correct combination .... .... [Kerala 2011]
a. Beers
p. Diapause
b. Snail
q. Hibernation
c. Zooplankton
r. Dormancy
d. Seeds
s. Aestivation
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a) a - r,b - s, c - p, d - q
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b) a - q,b - p, c- s, d - r
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c) a - q, b - s, c - p, d - r
0%
d) a - q, b - s, c - p, d – r
Explanation
Answer : (d)
Q.5
In autogenic succession .... .... [Kerala 2005]
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a) Community itself modifies its own environment thus causing its own replacement by new community
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b) Early dominance of heterotrophs
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c) Replacement of existing communities due to external conditions
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d) Early and continued dominance of autotrophic organisms
Explanation
Answer : (a)
Q.6
Insectivorous plants are adopted to soils .... .... [Manipal 1995]
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a) Rich in water
0%
b) Deficient in water
0%
c) Deficient in nitrogenous compounds
0%
d) Deficient in trace elements
Explanation
Answer:(c)
Q.7
Maximum quantity of humus occurs in .... .... [C.P.M.T.2003]
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a) Lowermost layer of soil
0%
b) Upper layer of soil
0%
c) Middle layer of soil
0%
d) Same everywhere
Explanation
Answer:(b)
Q.8
Match the columns and find the correct combination .... .... [Kerala 2008]
a. Camouflage
Dendrobates pumilio
b. Batesian mimicry
Horse-shoe bat
c. Warming colouration
Monarch butterfly
d. Echolocation
Praying mantis
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a) a - 2, b - 4, c - 3, d - 1
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b) a - 3, b - 4, c - 2, d - 1
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c) a - 4, b - 1, c -3, d - 2
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d) a - 4, b - 3, c - 1, d – 2
Explanation
Answer : (d)
Q.9
If green plants are removed from an aquarium, the fishes will .... .... [K.C.E.T. 1998]
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a) Die
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b) Increase in number
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c) Decreases in size
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d) Not be affected
Explanation
Answer : (a)
Q.10
Geometric representation of age structure is a characteristic of .... .... [C.B.S.E.2007]
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a) Biotic community
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b) Population
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c) Ecosystem
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d) Landscape
Explanation
Answer : (b)
Q.11
Humus is good for plant growth because .... .... [C.P.M.T.1991]
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a) It improves physical condition of soil
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b) It makes the soil porous
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c) It increase water holding and aeration of soil
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d) All the above
Explanation
Answer : (d)
Q.12
Waxy coating on the surface of floating leaves prevents .... .... [Odisha 2005]
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a) Respiration
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b) Photosynthesis
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c) Clogging of stomata
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d) Transpiration
Explanation
Answer : (c)
Q.13
In the population, rate of addition of new members is higher than the rate of individuals lost. it shows .... .... [A.I.I.M.S. 1997]
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a) Zero population growth
0%
b) Declined growth
0%
c) Exponential growth
0%
d) None of the above
Explanation
Answer : (c)
Q.14
Consider the following statements (a - d) each with one or two blanks a. Bears go into ----(1) during winter to cold weather b. A conical age pyramid with a broad base represents ----(3) human population c. A wasp pollinating a fig flower is an example of ---(4) d. An area with high levels of species richness is known as Find the correct fill up .... .... [C.B.S.E. Mains 2011]
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a) 3 - STABLE, 4 - COMMENSALISM, 5 - MARSH
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b) 1 - AESTIVATION, 2 - ESCAPE, 3 - STABLE, 4 - MUTUALISM
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c) 3 - EXPANDING, 4 - COMMENSALISM, 5 - BIODIVERSITY
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d) 1 - HIBERNATION, 2 - ESCAPE, 3 - EXPANDING, 5 - HOT SPOT
Explanation
Answer : (d)
Q.15
Competition for light, nutrients and space is most severe between .... .... [M.P.P.M.T. 1992]
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a) Closely related species growing different niche
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b) Closely related species growing in same habitat
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c) Distantly related species growing in same habitat
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d) Distantly related species growing in different niches
Explanation
Answer : (b)
Q.16
Plants growing under average conditions of temperature and moisture are .... .... [Manipur 2005]
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a) Hydrophytes
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b) Mesophytes
0%
c) Hygrophytes
0%
d) Epiphytes
Explanation
Answer : (b)
Q.17
Population was termed as self perpetuating unit by .... .... [A.M.U. 2003]
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a) Malthus
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b) Spencer
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c) Mobius
0%
d) Odum
Explanation
Answer : (a)
Q.18
Large unit of land having different communities is called .... .... [D.P.M.T.2007]
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a) Biome
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b) Ecosystem
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c) Niche
0%
d) Biosphere
Explanation
Answer : (a)
Q.19
What is best pH of soil for cultivation .... .... [C.B.S.E.2001]
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a) 3.4 - 5.4
0%
b) 4.5 - 5.5
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c) 5.5 - 6.5
0%
d) 6.5 - 7.5
Explanation
Answer : (c)
Q.20
Gause law is related to .... .... [Wardha 2011]
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a) Predators
0%
b) Parasitism
0%
c) Competitive exclusion
0%
d) Coexistence
Explanation
Answer : (c)
Q.21
Competition is severe in a population that has a distribution .... ..... [M.P.P.M.T. 1994]
0%
a) Irregular
0%
b) Uniform
0%
c) Random
0%
d) Nonrandom
Explanation
Answer : (a)
Q.22
Roots of higher plants develop mycorrhiza for obtaining ..... ..... [Guj.C.E.T. 2008]
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a) Sulphates
0%
b)Nitrogen
0%
c) Phosphates
0%
d) All the above
Explanation
Answer : (d)
Q.23
Ephemerals are a type of xerophytes .... .... [C.P.M.T.2000]
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a) Drought escaping
0%
b) Drought resisting
0%
c) Drought enduring
0%
d) None of the above
Explanation
Answer : (a)
Q.24
In a population the rate of addition of new members is more than the members lost. The population shows .... .... [Kerala 2004]
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a) Exponential growth
0%
b) Fluctuating growth
0%
c) Declining growth
0%
d) Zero population growth
Explanation
Answer : (a)
Q.25
A mutually beneficial association necessary for survival of both partners is .... .... [A.M.U. 2009]
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a) Mutualism/symbiosis
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b) Commensalism
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c) Amensalism
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d) Both A and B
Explanation
Answer : (a)
Q.26
Good ozone is found in .... .... [C.B.S.E.2011]
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a) Mesosphere
0%
b) Ionosphere
0%
c) Stratosphere
0%
d) Troposphere
Explanation
Answer : (c)
Q.27
Mycorrhiza is an example of .... .... [Har.P.M.T. 2007]
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a) Symbiotic relationships
0%
b) Ectoparasitism
0%
c) Endoparasitism
0%
d) Decomposers
Explanation
Answer : (a)
Q.28
Animals undergo inactive stage during winter it is ..... ..... [B.H.U.2006]
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a) Acclimatization
0%
b) Hibernation
0%
c) Aestivation
0%
d) Adaptation
Explanation
Answer : (b)
Q.29
The term biosphere is used for a zone containing living beings .... .... [C.P.M.T.1989]
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a) In lithosphere, hydrosphere and atmosphere
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b) In lithosphere and hydrosphere
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c) In hydrosphere
0%
d) On lithosphere
Explanation
Answer : (a)
Q.30
Alien species introduced into lake Victoria that was responsible for extinction of cichlid species of ..... ..... [Kerala 2010]
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a) African catfish
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b) Murrels
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c) Carrot grass
0%
d) Nile perch
Explanation
Answer : (d)
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