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Organisms And The Environment Mcq
Quiz 5
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Q.1
There are two ways of exploitation. One way is parasitism. Which is the other one .... .... [Guj.C.E.T. 2011]
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a) antibiosis
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b) Competition
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c) Predation
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d) Commensalism
Explanation
Answer : (c)
Q.2
The abundance of a species population within its habitat is called .... .... [C.B.S. E. 1995]
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a) Absolute density
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b) Regional density
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c) Relative density
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d) Niche density
Explanation
Answer:(d)
Q.3
Zoochlorellae in Hydra produce an association called .... .... [Har.P.M.T. 2007]
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a) Commensalism
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b) Parasitism
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c) Mutualism
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d) Predation
Explanation
Answer : (c)
Q.4
Mycorrhiza is symbiotic association between .... ..... [Kerala 2002]
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a) Algae and fungi
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b) Algae and roots of plants
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c) Fungi and roots of plants
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d) Viruses and bacteria
Explanation
Answer : (c)
Q.5
Plants growing on sandstone are .... .... [R.P.M.T. 2000]
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a) Psammophytes
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b) Oxylophytes
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c) Lithophytes
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d) Phanerophytes
Explanation
Answer : (c)
Q.6
Biome is .... .... [Odisha 2003]
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a) Sum of ecosystems in a geographical area
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b) Sum of ecosystem of the whole earth
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c) Biotic component of an ecosystem
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d) Biotic potential of a population
Explanation
Answer : (a)
Q.7
Ear lobes of arctic fox are smaller than that of tropical fox. This is .... .... [E.A.M.C.E.T.2005]
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a) Jordan's rule
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b) Bergman's rule
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c) Allen's rule
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d) Gloger's rule
Explanation
Answer : (c)
Q.8
Submerged hydrophytes have well developed .... .... [B.H.U.1989]
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a) Vascular system
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b) Aerenchyma
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c) Root system
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d) Stomatal system
Explanation
Answer : (b)
Q.9
Population of an insect species increases explosively during rainy season and then disappears at the end of the season. it shows .... .... [C.B.S.E.2007]
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a) Food plants mature and die at the end of rainy season
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b) Population of predators increases enormously
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c) Population growth curve is J-shaped
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d) Population growth curve is S-shaped
Explanation
Answer : (c)
Q.10
Vivipary occurs in .... .... [Wardha2000]
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a) Betula
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b) Rhizophora
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c) Mango
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d) Psidium
Explanation
Answer : (b)
Q.11
A teacher explaining physical contact leading to equal physiological dependence between two thalloid forms was telling about .... .... [ E.A.M.C.E.T. 2009]
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a) Mycorrhizal association
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b) Establishment of heterothallism
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c) Operation of heterothallism
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d) Advent of lichen formation
Explanation
Answer : (d)
Q.12
Community is .... .... [C.P.M.T. 2002]
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a) Group of independent, interaction populations of same species
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b) Group of independent, interaction populations of sAme species in specific area
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c) Group of independent, interaction populations of different species in specific area
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d) Group of independent, interaction populations of different species
Explanation
Answer : (c)
Q.13
A bird introduced from another country became a serious pest due to .... .... [D.P.M.T. 1996]
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a) Better adaptation to new area
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b) More sexual reproduction
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c) Better nesting habitats
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d) Absence of natural competition
Explanation
Answer : (d)
Q.14
Deserts can be converted into green land by .... .... [A.M.U. 1998]
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a) Tropical trees
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b) Oxylophytes
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c) Halophytes
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d) Psammophytes
Explanation
Answer : (d)
Q.15
Stomata open at night in .... .... [Odisha 2012]
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a) Succulents
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b) Xerophytes
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c) Hydrophytes
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d) Mesophytes
Explanation
Answer:(a)
Q.16
Term used to describe non-dominant species that dictates community structure is .... .... [Kerala 2004]
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a) Pioneer species
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b) Keystone species
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c) Transitional species
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d) Exogenous species
Explanation
Answer : (b)
Q.17
Keystone species should be protected as they .... .... [A.I.I.M.S. 2006]
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a) Are capable of surviving in harsh conditions of environment
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b) Indicate presence of certain minerals in the soil
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c) Have become rare due to over-exploitation
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d) Play an important role in supporting other species
Explanation
Answer : (d)
Q.18
Synecology is study of inter-relationship between environment and .... .... [E.A.M.C.E.T.1995]
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a) Individual plant
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b) A population
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c) A community
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d) Individual plant
Explanation
Answer : (c)
Q.19
Different communities appearing and replacing one another are called .... .... [R.P.M.T. 2011]
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a) Climax communities
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b) Seral communities
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c) Serial communities
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d) Successive communities
Explanation
Answer : (b)
Q.20
Which one is exclusive xerophytic adaptation? .... .... [Har.P.M.T.2000]
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a) Absence of stomata
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b) Long tap root system
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c) Stipular leaves
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d) Spines
Explanation
Answer : (d)
Q.21
Population of individuals belonging to same genetic stock differing markedly in vegetative characteristics are .... .... [C.E.T.Chd. 2006]
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a) Flora
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b) Ecotype
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c) Ecotone
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d) Ecads
Explanation
Answer : (d)
Q.22
A matching pair is .... .... [A.I.I.M.S. 2003]
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a) Shark and sucker fish - commensalism
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b) Algae and fungi in lichens - mutualism
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c) Orchids growing on trees - parasitism
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d) Cuscuta growing on other flowering plants – Epiphytes
Explanation
Answer : (b)
Q.23
Which take part in symbiosis of lichen .... .... [C.P.M.T. 1996]
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a) Alga - fungus
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b) Alga - alga
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c) Fungus - fungus
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d) Fungus – gymnosperm
Explanation
Answer : (a)
Q.24
Organisms restricted to narrow range of temperature are .... .... [H.P.P.M.T. 2012]
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a) Stenothermal
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b) Eurythermal
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c) Biothermal
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d) Geothermal
Explanation
Answer : (a)
Q.25
Biotrophic nutrition is shown by .... .... [C.P.M.T.2010]
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a) Humans
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b) Invertebrates
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c) Insectivorous plants
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d) Saprophytic plants
Explanation
Answer : (c)
Q.26
Organisms spending most of the time in transitional area between the two communities are .... .... [H.P.P.M.T. 2005]
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a) Keystone species
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b) Critical link species
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c) Exotic species
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d) Edge species
Explanation
Answer : (d)
Q.27
In xerophytes, photosynthesis often occurs through .... ..... [Bih.P.M.T.2006]
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a) Root
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b)Modified stem
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c) Stomata
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d) Scaly leaves
Explanation
Answer : (b)
Q.28
Ecology was coined by .... .... [H.P.P.M.T.1995]
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a) Linnaeus
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b) Haeckel
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c) Harvey
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d) Odum/Lamarck
Explanation
Answer : (b)
Q.29
ASSERTION: Most marine animals find it difficult to live in fresh water and vice versa REASON: Some animals can tolerate a narrow salinity range while others can bear a wide salinity range A.I.I.M.S.2012
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (b)
Q.30
Hibernation occurring in certain animals is .... .... [A.M.U.2000]
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a) Occasional
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b) Intermittent
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c) Rhythmic
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d) Periodic
Explanation
Answer : (d)
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