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Quiz 14
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Q.1
Which is an example of positive feed back? .... .... [C.P.M.T.2000]
0%
a) Seasonal growth
0%
b) Vessel diameter and blood pressure
0%
c) Allosteric inhibition of enzymes
0%
d) Both A and B
Explanation
Answer : (a)
Q.2
In an aquatic ecosystems, trophic levels equivalent to cows in grassland is .... .... [D.P.M.T. 2009]
0%
a) Nekton
0%
b) Phytoplankton
0%
c) Benthos
0%
d) Zooplankton
Explanation
zooplankton are primarily found in surface waters where food resources (phytoplankton or other zooplankton) are abundant. Answer : (b)
Q.3
Ecosystem contains .... ..... [M.P.P.M.T.2011]
0%
a) Food web
0%
b) Food chain
0%
c) Both A and B
0%
d) None
Explanation
Answer : (c)
Q.4
Eroded soils are .... .... [C.P.M.T.1989]
0%
a) Devoid of plants nutrients
0%
b) Richer in plant nutrients
0%
c) Unaltered in plant nutrients
0%
d) fit for agriculture
Explanation
Answer : (a)
Q.5
A habitat with long severe winter and growing season of a few months of summer forms ..... ..... [C.P.M.T.1991]
0%
a) Grasslands
0%
b) Tundra ecosystem
0%
c) Taiga
0%
d) Savannah
Explanation
Answer : (b)
Q.6
Decomposition rate is slow if detritus is rich in .... .... [ Kerala 2012]
0%
a) Nitrogen
0%
b) Humus
0%
c) Sugars
0%
d) Lignin and chitin
Explanation
Answer : (d)
Q.7
In lake ecosystem, the pyramid of biomass is generally .... .... [Pb.P.M.T.2007]
0%
a) Spindle - shaped
0%
b) Inverted
0%
c) Upright
0%
d) Horizontal
Explanation
Answer : (b)
Q.8
Out of nutrient cycles of sulphur (a) phosphorous (b) carbon (c) nitrogen (d) which one is sedimentary .... .... [Kerala 2010]
0%
a) a only
0%
b) b only
0%
c) c only
0%
d) a and b only
Explanation
Answer : (d)
Q.9
Pheretima and its close relatives obtain nourishment from .... .... [C.B.S.E. 2012]
0%
a) Decaying fallen leaves and soil organic matter
0%
b) Soil insects
0%
c) Sugarcane roots
0%
d) Small pieces of fresh fallen leaves of Maize and others
Explanation
Answer : (a)
Q.10
Which is correct food chain in grassland? .... .... [H.P.P.M.T.2005]
0%
a) Grass → snake → insect → deer
0%
b) Gras → wolf → deer → buffalo
0%
c) Bacteria → grass → rabbit → wolf
0%
d) Grass → insect → frog → snake
Explanation
Answer : (d)
Q.11
Quercus species are dominant component of .... .... [C.B.S.E. 2008]
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a) Temperate forest
0%
b) Tropical rain forest
0%
c) Alpine forest
0%
d) Scrub forest
Explanation
Answer : (a)
Q.12
Biotic community along with its interacting physical environment comprises .... ..... [D.P.M.T.1997]
0%
a) Phytosociology
0%
b) Phytogeography
0%
c) Ecosystem
0%
d) Ecology
Explanation
Answer : (c)
Q.13
Pyramid of energy is always upright indicating that .... .... [K.C.E.T. 2005]
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a) Producers have the lowest energy
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b) Carnivores have a better energy efficiency than herbivores
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c) Energy conversion efficiency is same for all trophic levels
0%
d) Herbivores have a better energy conversion efficiency than Carnivores
Explanation
Answer : (d)
Q.14
An inexhaustible non-conventional energy source is .... .... [Har P.M.T.2004]
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a) Coal
0%
b)Petroleum
0%
c) Solar radiation
0%
d) Electricity from nuclear plants
Explanation
Answer : (c)
Q.15
Nitrogen fixation is ..... ..... [B.H.U.2000]
0%
a) Nitrogen → ammonia
0%
b) Nitrogen → nitrates
0%
c) Nitrogen → amino acid
0%
d) Both A and B
Explanation
Answer : (d)
Q.16
Deforestation is the major causal agent of .... .... [M.P.P.M.T. 11989]
0%
a) Depletion of natural resources
0%
b) Environmental pollution
0%
c) Desertification of habitat
0%
d) Genetic erosion
Explanation
Answer : (c)
Q.17
Tiger lies at the apex of food chain because .... .... [Odisha 2002]
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a) Tiger has maximum biomass
0%
b) Tiger feeds on a number of herbivores which feed on number of plants
0%
c) Tiger has many enemies
0%
d) Tiger is omnivores
Explanation
Answer : (b)
Q.18
If the decomposers become extinct, the most severely affected would be .... .... [B.H.U.2003]
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a) Non-cycling of minerals
0%
b) Damage to nitrogen fixation
0%
c) Biomagnification
0%
d) Carnivores will be starved
Explanation
Answer : (a)
Q.19
American water plant that has become a troublesome water weed in India is .... .... [C.B.S.E 1993]
0%
a) Cyperus rotundus
0%
b) Eichhornia crassipes
0%
c) Trapa latifolia
0%
d) Trapa bispinosa
Explanation
Answer : (b)
Q.20
Flow of energy declines as it passes from lower to higher trophic level. This is explained by .... .... [C.P.M.T.1992]
0%
a) First law of thermodynamics
0%
b) Second law of thermodynamics
0%
c) Newton's second law
0%
d) Newton's third law
Explanation
Answer : (b)
Q.21
Which of the following is not used for construction of ecological pyramids? .... .... [C.B.S.E.2006]
0%
a) Fresh weight
0%
b) Dry weight
0%
c) Number of individuals
0%
d) Rate of energy flow
Explanation
Ecological pyramids are the graphical representation of the trophic structure and function at successive trophic levels. Ecological pyramids are of three general types, (i) Pyramid of numbers, showing the number of organisms at each level.(ii) Pyramid of biomass, showing the total dry weight of living matter.(iii) Pyramid of energy, showing the rate of energy flow/productivity at successive trophic levels. Answer : (a)
Q.22
Match the following .... ..... [Kerala 2008]
a. tropical rain forest
hopea
b. tropical deciduous forest
shorea
c. temperate broad leaf forest
quercus
d. temperate coniferous forest
picea
0%
a) a - 2, b - 1, c - 4, d - 3
0%
b) a - 1, b - 2, c - 3, d - 4
0%
c) a - 3, b - 2, c - 1, d - 4
0%
d) a - 1, b - 2, c - 4, d – 3
Explanation
Answer : (b)
Q.23
In the absence of decomposers, ecosystem functioning is adversely affected due to .... ..... [C.B.S.E. 1995]
0%
a) Blocking of energy flow
0%
b) blocking of mineral cycling
0%
c) Blocking of solar energy to herbivores
0%
d) Rate of decomposers of other components will increase
Explanation
Answer : (b)
Q.24
Soil conservation is .... .... [C.B.S.E 1989]
0%
a) Conversion of sterile soil into fertile one
0%
b) Aeration of soil
0%
c) Erosion of soil
0%
d) Protection against loss
Explanation
Answer : (d)
Q.25
Crystalline rocks are natural sources of biogenetic element .... .... [Kerala 2000]
0%
a) Carbon
0%
b) Sodium
0%
c) Phosphorus
0%
d) Magnesium
Explanation
Answer : (c)
Q.26
Rate of formation of organic matter by rabbit in a grassland is .... .... [C.B.S.E. 2012]
0%
a) Gross primary production
0%
b) net primary production
0%
c) Net productivity
0%
d) Secondary productivity
Explanation
Answer : (d)
Q.27
Savannah is found commonly in .... .... [Pb.P.M.T.2011]
0%
a) U.S.A
0%
b) U.S.S.R
0%
c) Australia
0%
d) India
Explanation
Answer : (c)
Q.28
Who have tried to put price tag on nature's life support services .... .... [H.P.P.M.T.2011]
0%
a) Robert Costanza
0%
b) Nile Perch
0%
c) Herbert Boyer
0%
d) Ram Deo Misra
Explanation
Answer : (a)
Q.29
The accompanying figure represents an ecological pyramids. It is .... .... [ AIIMS 2005]
0%
a) Pyramid of numbers in grassland
0%
b) Pyramid of biomass in fallow land
0%
c) Pyramid of biomass in lake
0%
d) Energy pyramid in a spring
Explanation
Answer : (c)
Q.30
In the pyramid of numbers find out the correct possibilities .... .... [ CBSE 2012]
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a) Level PC is rats and level SC is cat
0%
b) Level PP is phytoplankton in sea and level TC is whale
0%
c) Level PP is pipal tree and level SC is sheep
0%
d) Level PC is insects and level SC is small insectivorous birds
Explanation
Answer : (d)
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