Q.1.
Which is an example of positive feed back? .... .... [C.P.M.T.2000]
-
50%
a) Seasonal growth
-
50%
b) Vessel diameter and blood pressure
-
0%
c) Allosteric inhibition of enzymes
-
0%
d) Both A and B
Q.2.
In an aquatic ecosystems, trophic levels equivalent to cows in grassland is .... .... [D.P.M.T. 2009]
-
0%
a) Nekton
-
50%
b) Phytoplankton
-
0%
c) Benthos
-
50%
d) Zooplankton
Q.3.
Ecosystem contains .... ..... [M.P.P.M.T.2011]
-
0%
a) Food web
-
0%
b) Food chain
-
100%
c) Both A and B
-
0%
d) None
Q.4.
Eroded soils are .... .... [C.P.M.T.1989]
-
100%
a) Devoid of plants nutrients
-
0%
b) Richer in plant nutrients
-
0%
c) Unaltered in plant nutrients
-
0%
d) fit for agriculture
Q.5.
A habitat with long severe winter and growing season of a few months of summer forms ..... ..... [C.P.M.T.1991]
-
50%
a) Grasslands
-
50%
b) Tundra ecosystem
-
0%
c) Taiga
-
0%
d) Savannah
Q.6.
Decomposition rate is slow if detritus is rich in .... .... [ Kerala 2012]
-
50%
a) Nitrogen
-
0%
b) Humus
-
0%
c) Sugars
-
50%
d) Lignin and chitin
Q.7.
In lake ecosystem, the pyramid of biomass is generally .... .... [Pb.P.M.T.2007]
-
0%
a) Spindle - shaped
-
100%
b) Inverted
-
0%
c) Upright
-
0%
d) Horizontal
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
-
50%
b) b only
-
0%
c) c only
-
50%
d) a and b only
Q.9.
Pheretima and its close relatives obtain nourishment from .... .... [C.B.S.E. 2012]
-
100%
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
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
-
100%
c) Bacteria → grass → rabbit → wolf
-
0%
d) Grass → insect → frog → snake
Q.11.
Quercus species are dominant component of .... .... [C.B.S.E. 2008]
-
50%
a) Temperate forest
-
0%
b) Tropical rain forest
-
50%
c) Alpine forest
-
0%
d) Scrub forest
Q.12.
Biotic community along with its interacting physical environment comprises .... ..... [D.P.M.T.1997]
-
0%
a) Phytosociology
-
0%
b) Phytogeography
-
50%
c) Ecosystem
-
50%
d) Ecology
Q.13.
Pyramid of energy is always upright indicating that .... .... [K.C.E.T. 2005]
-
100%
a) Producers have the lowest energy
-
0%
b) Carnivores have a better energy efficiency than herbivores
-
0%
c) Energy conversion efficiency is same for all trophic levels
-
0%
d) Herbivores have a better energy conversion efficiency than Carnivores
Q.14.
An inexhaustible non-conventional energy source is .... .... [Har P.M.T.2004]
-
100%
a) Coal
-
0%
b)Petroleum
-
0%
c) Solar radiation
-
0%
d) Electricity from nuclear plants
Q.15.
Nitrogen fixation is ..... ..... [B.H.U.2000]
-
50%
a) Nitrogen → ammonia
-
0%
b) Nitrogen → nitrates
-
0%
c) Nitrogen → amino acid
-
50%
d) Both A and B
Q.16.
Deforestation is the major causal agent of .... .... [M.P.P.M.T. 11989]
-
0%
a) Depletion of natural resources
-
100%
b) Environmental pollution
-
0%
c) Desertification of habitat
-
0%
d) Genetic erosion
Q.17.
Tiger lies at the apex of food chain because .... .... [Odisha 2002]
-
0%
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
-
100%
d) Tiger is omnivores
Q.18.
If the decomposers become extinct, the most severely affected would be .... .... [B.H.U.2003]
-
100%
a) Non-cycling of minerals
-
0%
b) Damage to nitrogen fixation
-
0%
c) Biomagnification
-
0%
d) Carnivores will be starved
Q.19.
American water plant that has become a troublesome water weed in India is .... .... [C.B.S.E 1993]
-
100%
a) Cyperus rotundus
-
0%
b) Eichhornia crassipes
-
0%
c) Trapa latifolia
-
0%
d) Trapa bispinosa
Q.20.
Flow of energy declines as it passes from lower to higher trophic level. This is explained by .... .... [C.P.M.T.1992]
-
100%
a) First law of thermodynamics
-
0%
b) Second law of thermodynamics
-
0%
c) Newton's second law
-
0%
d) Newton's third law
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
-
100%
c) Number of individuals
-
0%
d) Rate of energy flow
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
-
100%
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
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
-
100%
b) blocking of mineral cycling
-
0%
c) Blocking of solar energy to herbivores
-
0%
d) Rate of decomposers of other components will increase
Q.24.
Soil conservation is .... .... [C.B.S.E 1989]
-
0%
a) Conversion of sterile soil into fertile one
-
100%
b) Aeration of soil
-
0%
c) Erosion of soil
-
0%
d) Protection against loss
Q.25.
Crystalline rocks are natural sources of biogenetic element .... .... [Kerala 2000]
-
100%
a) Carbon
-
0%
b) Sodium
-
0%
c) Phosphorus
-
0%
d) Magnesium
Q.26.
Rate of formation of organic matter by rabbit in a grassland is .... .... [C.B.S.E. 2012]
-
100%
a) Gross primary production
-
0%
b) net primary production
-
0%
c) Net productivity
-
0%
d) Secondary productivity
Q.27.
Savannah is found commonly in .... .... [Pb.P.M.T.2011]
-
0%
a) U.S.A
-
0%
b) U.S.S.R
-
100%
c) Australia
-
0%
d) India
Q.28.
Who have tried to put price tag on nature's life support services .... .... [H.P.P.M.T.2011]
-
100%
a) Robert Costanza
-
0%
b) Nile Perch
-
0%
c) Herbert Boyer
-
0%
d) Ram Deo Misra
Q.29.
The accompanying figure represents an ecological pyramids. It is .... .... [ AIIMS 2005]
-
100%
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
Q.30.
In the pyramid of numbers find out the correct possibilities .... .... [ CBSE 2012]
-
0%
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
-
100%
d) Level PC is insects and level SC is small insectivorous birds