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