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NEET Biology MCQ
Organisms And The Environment Mcq
Quiz 10
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Q.1
Changes in nature of population are called .... .... [M.H.T.C.E.T. 2011]
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a) Demography
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b) Vital index
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c) Demecology
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d) Population dynamics
Explanation
Answer:(d)
Q.2
Small fish sticks to bottom of shark to obtain food crumbs. The association is .... .... [C.P.M.T. 2008]
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a) Antibiosis
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b) Predation
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c) Commensalism
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d) Parasitism
Explanation
Answer:(c)
Q.3
Figs belongs to .... .... [D.P.M.T. 2010]
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a) Keystone spices as they show animal dependent pollination .
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b) Keystone species as they produce food and provide protection to animals during lean period.
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c) Critical link species as they form connecting link between trees and herbs.
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d) Critical link species as they establish essential links for absorbing nutrients from soil and organic residues.
Explanation
Answer : (b)
Q.4
Submerged hydrophytes exchange gases through .... .... [C.P.M.T.2001]
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a) Stomata
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b) Hydrophytes
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c) Lenticels
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d) General surface
Explanation
Answer : (d)
Q.5
Which of the following is polygamous? .... .... [B.H.U. 2005]
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a) Wolf
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b) Swan
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c) Deer
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d) Fox
Explanation
Answer : (c)
Q.6
Succession in a 6 metre deep pond exhibition a sequence of .... .... [C.P.M.T. 1991]
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a) Submerged plants → reeds → herbs → floating plants → shrubs → trees
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b) Floating plants → submerged plants → reeds → herbs → shrubs → trees
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c) Shrubs → trees → submerged plants → floating plants → reeds → herbs
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d) Submerged plants → floating plants →> reeds → herbs → shrubs → trees
Explanation
Answer : (d)
Q.7
Characteristic feature of mangrove plants is .... .... [H.P.P.M.T.2005]
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a) Apospory
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b) Heterospory
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c) Parthenocarpy
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d) Vivipary
Explanation
Answer : (d)
Q.8
Atmosphere consists of .... .... [PbP.M.T.2000]
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a) Lithosphere + hydrosphere
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b) Lithosphere + stratosphere + hydrosphere
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c) Troposphere + stratosphere + ionosphere
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d) None of the above
Explanation
Answer : (c)
Q.9
Terrestrial pteridophytes are able to grow in tropical rain forest because of .... ..... [Guj.C.E.T 2008]
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a) Microclimate
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b) C4 pathway
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c) Eutrophication
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d) Biological magnification
Explanation
Answer : (a)
Q.10
At asymptote stage, the population is .... .... [M.P.P.M.T. 2002]
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a) Stabilised
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b) Increasing
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c) Decreasing
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d) Changing
Explanation
Answer : (a)
Q.11
Sigmoid/logistic growth curve is represented by .... .... [C.B.S.E 2011]
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a) dN/dt = rN
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b) dN/dt = rN(1-N/K)
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c) Nt = N0+ B + I - D - E
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d) dN/dt = 1 - N/K
Explanation
Answer : (b)
Q.12
Allelopathy is caused by release of .... .... [B.H.U.2002]
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a) Poison
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b) Toxin
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c) Pheromone
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d) Chemical
Explanation
Answer:(b)
Q.13
Plants growing under shade of other plants are .... .... [ kerala 2009]
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a) Epiphytes
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b) Semi-epiphytes
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c) Mesophytes
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d) Sciophytes
Explanation
Answer:(d)
Q.14
Population of an area tends to increase when .... .... [A.M.U. 1997]
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a) Reproductivity decreases
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b) Immigration increases
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c) Emigration occurs
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d) Predation increases
Explanation
Answer : (b)
Q.15
The aggregate of processes that determine the size and composition of any population is known as .... .... [M.P.P.M.T. 1995]
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a) Population dynamics
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b) Population dispersal
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c) Population explosion
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d) Population density
Explanation
Answer : (a)
Q.16
A force that acts against maximum population growth is .... .... [C.B.S.E. 1998]
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a) Population pressure
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b) Carrying capacity
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c) Saturation point
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d) Environment resistance
Explanation
Answer : (d)
Q.17
Dominant species represents most abundant .... ....
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a) Herb that binds the soil and provides organic matter to it
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b) Shrub that appears for the first time
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c) First tree
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d) Species having major effect on physical environment
Explanation
Answer : (d)
Q.18
Root cap is absent in .... .... [R.P.M.T.2002]
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a) Halophytes
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b) Hydrophytes
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c) Xerophytes
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d) Homophytes
Explanation
Answer : (b)
Q.19
Transitional layer between stratosphere and mesosphere is .... .... [H.P.P.M.T. 2007]
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a) Troposphere
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b) Lithosphere
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c) Stratosphere
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d) Tropopause
Explanation
Answer : (c)
Q.20
Which is the following is wrong? .... .... [K.C.E.T. 1998]
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a) Lichen, an association of fungus and alga, is an example of mutualism
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b) Epiphytes, using other plants for support only and not for water or food, show commensalism
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c) Sea anemone and hermit crab association is an example of proto-cooperation
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d) Mutualism, proto-cooperations and commensalism cannot be included under symbiosis
Explanation
Answer : (d)
Q.21
A symbiotic bacterium is .... .... [J.K.C.M.E.E.2010]
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a) Nitrobacter
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b) Nitrosococcus
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c) Nitrocystis
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d) Rhizobium
Explanation
Answer : (d)
Q.22
Climatology is science of
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a) Edaphic factors
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b) Topographic factors
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c) Climate factors
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d) Biotic factors
Explanation
Answer : (c)
Q.23
Presence of higher diversity at the junction of territories of two different habitat is called .... .... [B.H.U. 2008]
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a) Bottle neck effect
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b) Edge effect
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c) Junction effect
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d) Pasteur effect
Explanation
Answer : (b)
Q.24
Viviparity and pneumatophores are features of .... .... [B.H.U.2005]
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a) Hydrophytes
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b) Halophytes
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c) Mesophytes
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d) Xerophytes
Explanation
Answer : (b)
Q.25
In plant succession, the net productivity of climax community .... .... [Kerala 2005]
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a) Continues to increase
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b) Becomes stable
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c) Becomes halved
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d) Becomes zero
Explanation
Answer : (b)
Q.26
In ecological succession from pioneer to climax community, the biomass shall C.P.M.T. 1991
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a) Decrease
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b) Increase and then decrease
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c) no relation
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d) Increase continuously
Explanation
Answer:(d)
Q.27
Resemblance of an organisms to another for protection and hiding is .... .... [D.P.M.T. 2011]
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a) Camouflage
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b) Mimicry
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c) Predation
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d) Adaptation
Explanation
Answer : (b)
Q.28
Two species cannot live in the same niche due to .... .... [C.B.S.E. 2002]
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a) Allen's law
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b) Gause hypothesis
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c) Doll's rule
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d) Weismann's theory
Explanation
Answer : (b)
Q.29
Ao layer is rich in .... .... [C.P.M.T.2007]
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a) Litter
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b) Minerals
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c) Leachates
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d) Humus
Explanation
Answer : (d)
Q.30
An unrestricted or maximum reproduction capacity is called .... .... [C.B.S.E. 2002]
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a) Birth rate
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b) Biotic potential
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c) Carrying capacity
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d) Fertility
Explanation
Answer : (b)
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