Which ecosystem has the highest gross primary productivity? .... .... [M.P.P.M.T.2012]
100%
a) Rain forest
0%
b) Coral reefs
0%
c) Mangroves
0%
d) Grasslands
Q.4.
Soil salinity is measured by .... .... [B.H.U. 2000]
0%
a) Porometer
50%
b) Potometer
50%
c) Calorimeter
0%
d) Conductivity meter
Q.5.
The major components of an ecosystem are .... .... [M.P.P.M.T. 1992]
33%
a) Food chain and decomposers
0%
b) Mineral cycling and energy flow
33%
c) Food chain and energy flow
33%
d) Energy flow and decomposers
Q.6.
Main cause of soil erosion is .... .... [C.P.M.T.1993]
33%
a) Afforestation
0%
b) Less rains
0%
c) Thinning of ozone layer
67%
d) Deforestation
Q.7.
Number of primary producers per unit area would be maximum in ..... .... [M.P.P.M.T.1995]
33%
a) Forest ecosystem
33%
b) Pond ecosystem
0%
c) Desert
33%
d) Grassland ecosystem
Q.8.
Universal non polluting source of energy is .... .... [Wardha 2003]
0%
a) Fossil fuel
67%
b) Sun
33%
c) Nuclear
0%
d) Wind and water
Q.9.
In biotic community, primary consumers are .... ..... [B.H.U.2002]
0%
a) Carnivores
0%
b) Omnivores
100%
c) Herbivores
0%
d) Detritivores
Q.10.
Concept of life forms was given by .... ..... [B.H.U.1998]
33%
a) Weaver
33%
b) Clements
33%
c) Raunkiaer
0%
d) Turesson
Q.11.
The biomass of each succeeding trophic level is .... .... [A.M.U.2002]
0%
a) More than the one preceding
100%
b) Less than the one preceding
0%
c) Constantly fixed
0%
d) Equal to next trophic level
Q.12.
Nitrogen fixation in root nodules of Alnus is brought about by .... .... [C.B.S.E. 2008]
67%
a) Azorhizobium
33%
b) Frankia
0%
c) Bradyrhizobium
0%
d) Clostridium
Q.13.
Biome has organisms of various trophic levels .... .... [A.M.U.1999]
50%
a) Reacting with abiotic environment
0%
b) Constitute a sociological unit
50%
c) Live a symbiotic life
0%
d) Inhabit a desert
Q.14.
In the soil conservation method, several grasses are left out in soil after the crop is harvested .... .... [Guj C.E.T. 2007]
0%
a) Tillage
100%
b) Crop rotation
0%
c) Terrace farming
0%
d) Contour farming
Q.15.
Old leguminous roots turn green due to ..... ..... [C.P.M.T.1998]
50%
a) Conversion of lehghaemoglobin to chl a
0%
b) Breakdown of lehghaemoglobin
50%
c) Conversion of lehghaemoglobin to chl b
0%
d) Conversion of lehghaemoglobin to chl c
Q.16.
Decomposers are .... .... [B.H.U.2008]
0%
a) Autotrophs
0%
b) Heterotrophs/organotrophs
50%
c) Autoheterotrophs
50%
d) Chemoautotrophs
Q.17.
Pyramid of numbers in a pond ecosystem is .... .... [C.B.S.E.1993]
0%
a) Irregular
50%
b) Inverted
50%
c) Upright
0%
d) Spindle-shaped
Q.18.
An incomplete ecosystem is .... .... [W .B. 2008]
0%
a) Grassland
0%
b) River
50%
c) Wetland
50%
d) Cave
Q.19.
Shifting cultivation or jhum belongs to category of .... .... [Kerala 2006]
0%
a) Industrial forestry
50%
b) Agroforestry
0%
c) Commercial forestry
50%
d) Social forestry
Q.20.
Phytoplankton are destroyed it will .... ..... [M.P.P.M.T.2000]
100%
a) Cause spurt in population of primary consumers
0%
b) Rapid growth of phase
0%
c) Affect the food chain
0%
d) Have no effect
Q.21.
Plains with snow, ice, frozen soil for most of the year are found in .... .... [Kerala 2000]
0%
a) Chaparral
0%
b) Taiga
100%
c) Tundra
0%
d) Desert
Q.22.
Shola forests occur in .... .... [D.P.M.T.2005]
0%
a) Indo Gangetic plain
0%
b)Terai
0%
c) Eastern Himalayas
100%
d) Western Ghats of Kerala
Q.23.
Correct sequences in a food chain is .... .... [A.F.M.C.1999]
100%
a) Grass → insects → birds → snake
0%
b) Grass → snake → insects → deer
0%
c) Grass → wolf → deer → buffalo
0%
d) Bacteria → grass → rabbit → wolf
Q.24.
ASSERTION: In tropical rain forests, O-horizon and A- horizon of soil profile are shallow nutrient poor REASON: Excessive growth of microorganisms in the soil depletes its organic content. A.I.I.M.S.2006
100%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Q.25.
The two components of an ecosystem are .... .... [M.P.P.M.T.1999]
0%
a) Plants and animals
0%
b) Weeds, trees, animals and man
0%
c) Energy flow and mineral cycling
100%
d) Biotic and abiotic
Q.26.
A man-made micro-ecosystem is .... .... [M.P.P.M.T.2001]
0%
a) Plants grown in a pond
100%
b) Crop field
0%
c) Tank formed naturally in our courtyard
0%
d) Lake in a forest
Q.27.
Number of individuals of a species in a particular ecosystem at a given time remains constant due to .... .... [M.P.P.M.T.1998]
0%
a) Predators
0%
b) Parasites
100%
c) Man
0%
d) Food
Q.28.
Mulching is helpful in .... .... [Pb .PMT 2007]
0%
a) Increasing soil fertility
0%
b) Improvement of soil structure
0%
c) Moisture and soil conservation
100%
d) Better crops
Q.29.
Maximum use of fresh water is in .... .... [M.H.T.C.E.T. 2010.]
100%
a) Agriculture
0%
b) Domestic use
0%
c) Industry
0%
d) Pisciculture
Q.30.
Which of the following occurs in abiotic component of an ecosystem? .... .... [M.P.P.M.T.1999]
0%
a) Flow of energy
0%
b) Cycling of materials
0%
c) Consumers
100%
d) Flow of energy and cycling of materials
Support mcqgeeks.com by disabling your adblocker.
Please disable the adBlock and continue. Thank you.