Q.1
Succulents grow in .... .... [Maipur 2007]
  • a) Tropical rain forest
  • b) Tundra
  • c) Desert
  • d) Temperate deciduous forests
Q.2
Which is wrongly matched? .... .... [Kerala 2005]
  • a) Rhizobium - free living nitrogen fixer
  • b) Humus - abiotic component
  • c) Phosphorous cycle - sedimentary
  • d) Shorea robusta - tropical deciduous forest
Q.3
Which ecosystem has the highest gross primary productivity? .... .... [M.P.P.M.T.2012]
  • a) Rain forest
  • b) Coral reefs
  • c) Mangroves
  • d) Grasslands
Q.4
Soil salinity is measured by .... .... [B.H.U. 2000]
  • a) Porometer
  • b) Potometer
  • c) Calorimeter
  • d) Conductivity meter
Q.5
The major components of an ecosystem are .... .... [M.P.P.M.T. 1992]
  • a) Food chain and decomposers
  • b) Mineral cycling and energy flow
  • c) Food chain and energy flow
  • d) Energy flow and decomposers
Q.6
Main cause of soil erosion is .... .... [C.P.M.T.1993]
  • a) Afforestation
  • b) Less rains
  • c) Thinning of ozone layer
  • d) Deforestation
Q.7
Number of primary producers per unit area would be maximum in ..... .... [M.P.P.M.T.1995]
  • a) Forest ecosystem
  • b) Pond ecosystem
  • c) Desert
  • d) Grassland ecosystem
Q.8
Universal non polluting source of energy is .... .... [Wardha 2003]
  • a) Fossil fuel
  • b) Sun
  • c) Nuclear
  • d) Wind and water
Q.9
In biotic community, primary consumers are .... ..... [B.H.U.2002]
  • a) Carnivores
  • b) Omnivores
  • c) Herbivores
  • d) Detritivores
Q.10
Concept of life forms was given by .... ..... [B.H.U.1998]
  • a) Weaver
  • b) Clements
  • c) Raunkiaer
  • d) Turesson
Q.11
The biomass of each succeeding trophic level is .... .... [A.M.U.2002]
  • a) More than the one preceding
  • b) Less than the one preceding
  • c) Constantly fixed
  • d) Equal to next trophic level
Q.12
Nitrogen fixation in root nodules of Alnus is brought about by .... .... [C.B.S.E. 2008]
  • a) Azorhizobium
  • b) Frankia
  • c) Bradyrhizobium
  • d) Clostridium
Q.13
Biome has organisms of various trophic levels .... .... [A.M.U.1999]
  • a) Reacting with abiotic environment
  • b) Constitute a sociological unit
  • c) Live a symbiotic life
  • 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]
  • a) Tillage
  • b) Crop rotation
  • c) Terrace farming
  • d) Contour farming
Q.15
Old leguminous roots turn green due to ..... ..... [C.P.M.T.1998]
  • a) Conversion of lehghaemoglobin to chl a
  • b) Breakdown of lehghaemoglobin
  • c) Conversion of lehghaemoglobin to chl b
  • d) Conversion of lehghaemoglobin to chl c
Q.16
Decomposers are .... .... [B.H.U.2008]
  • a) Autotrophs
  • b) Heterotrophs/organotrophs
  • c) Autoheterotrophs
  • d) Chemoautotrophs
Q.17
Pyramid of numbers in a pond ecosystem is .... .... [C.B.S.E.1993]
  • a) Irregular
  • b) Inverted
  • c) Upright
  • d) Spindle-shaped
Q.18
An incomplete ecosystem is .... .... [W .B. 2008]
  • a) Grassland
  • b) River
  • c) Wetland
  • d) Cave
Q.19
Shifting cultivation or jhum belongs to category of .... .... [Kerala 2006]
  • a) Industrial forestry
  • b) Agroforestry
  • c) Commercial forestry
  • d) Social forestry
Q.20
Phytoplankton are destroyed it will .... ..... [M.P.P.M.T.2000]
  • a) Cause spurt in population of primary consumers
  • b) Rapid growth of phase
  • c) Affect the food chain
  • d) Have no effect
Q.21
Plains with snow, ice, frozen soil for most of the year are found in .... .... [Kerala 2000]
  • a) Chaparral
  • b) Taiga
  • c) Tundra
  • d) Desert
Q.22
Shola forests occur in .... .... [D.P.M.T.2005]
  • a) Indo Gangetic plain
  • b)Terai
  • c) Eastern Himalayas
  • d) Western Ghats of Kerala
Q.23
Correct sequences in a food chain is .... .... [A.F.M.C.1999]
  • a) Grass → insects → birds → snake
  • b) Grass → snake → insects → deer
  • c) Grass → wolf → deer → buffalo
  • 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
  • a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
  • c) Assertion is true but, Reason is false
  • d) Assertion is false but, Reason is true
Q.25
The two components of an ecosystem are .... .... [M.P.P.M.T.1999]
  • a) Plants and animals
  • b) Weeds, trees, animals and man
  • c) Energy flow and mineral cycling
  • d) Biotic and abiotic
Q.26
A man-made micro-ecosystem is .... .... [M.P.P.M.T.2001]
  • a) Plants grown in a pond
  • b) Crop field
  • c) Tank formed naturally in our courtyard
  • 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]
  • a) Predators
  • b) Parasites
  • c) Man
  • d) Food
Q.28
Mulching is helpful in .... .... [Pb .PMT 2007]
  • a) Increasing soil fertility
  • b) Improvement of soil structure
  • c) Moisture and soil conservation
  • d) Better crops
Q.29
Maximum use of fresh water is in .... .... [M.H.T.C.E.T. 2010.]
  • a) Agriculture
  • b) Domestic use
  • c) Industry
  • d) Pisciculture
Q.30
Which of the following occurs in abiotic component of an ecosystem? .... .... [M.P.P.M.T.1999]
  • a) Flow of energy
  • b) Cycling of materials
  • c) Consumers
  • d) Flow of energy and cycling of materials
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