Q.1
Relationship between different organisms can best be studied by .... .... [D.P.M.T.2001]
  • a) Food webs
  • b) Pyramid of mass
  • c) Pyramid of energy
  • d) Eltonian pyramids
Q.2
Soil fertility is reduced by .... .... [C.B.S.E. 1992]
  • a) Crop rotation
  • b) Nitrogen fixing bacteria
  • c) Decaying organic matter
  • d) Intensive agriculture
Q.3
Green plants constitute ..... ..... [M.P.P.M.T.1999]
  • a) First trophic level
  • b) Second trophic level
  • c) Third trophic level
  • d) Fourth trophic level
Q.4
An inverted pyramid of numbers and an inverted pyramid of biomass are respectively seen in .... .... [Kerala 2012]
  • a) Grassland tree ecosystem
  • b) Sea and tree ecosystem
  • c) tree and sea ecosystem
  • d) Tree and grassland ecosystem
Q.5
Biological equilibrium is equilibrium amongst .... ..... [BiharP.M.T.2001]
  • a) Producers and decomposers
  • b) Producers and consumers
  • c) Producers and decomposers, consumers
  • d) Consumers and decomposers
Q.6
Para rubber is obtained from the latex of .... .... [J.K.C.M.E.E. 2007]
  • a) Ficus elastica
  • b) Hevea brasiliensis
  • c) Carica papaya
  • d) Musa paradisiaca
Q.7
Second most important trophic level in a lake is ..... ..... [C.B.S.E.1994]
  • a) Zooplankton
  • b) Phytoplankton
  • c) Benthos
  • d) Neuston
Q.8
Nitrates are transformed into nitrogen by .... .... [C.P.M.T.2003]
  • a) Ammonifying bacteria
  • b) Nitrifying bacteria
  • c) Denitrifying bacteria
  • d) Both A and B
Q.9
Planting of trees, shrubs and others in between crops plants for stabilization of soil is .... .... [M.H. T.C.E.T. 2008]
  • a) Taungya
  • b) Soil forestry
  • c) Production plantation
  • d) Agroforestry
Q.10
In an ecosystem, bacteria are .... ..... [M.P.P.M.T.1997]
  • a) Microconsumers.
  • b) Macroconsumers
  • c) Primary consumers
  • d) Secondary consumers
Q.11
Pyramid of numbers in grass ecosystem is .... .... [B.H.U.2002]
  • a) Linear
  • b) Upright
  • c) Inverted
  • d) Negative
Q.12
Removal of top fertile soil by wind or water is .... .... [B.H.U. 1991]
  • a) Siltation
  • b) Soil erosion
  • c) Weathering of soil
  • d) Leaching
Q.13
Lion is .... .... [E.A.M.C.E.T.1995]
  • a) Producer
  • b) Primary consumer
  • c) Predator
  • d) Secondary consumer
Q.14
An antiforest measure is .... .... [Pb.P.M.T. 2003]
  • a) Afforestation
  • b) Selective grazing
  • c) Clearing forest
  • d) Selective felling
Q.15
Role of bacteria in carbon cycle is .... .... [C.B.S.E.1998]
  • a) Photosynthesis
  • b) Chemosynthesis
  • c) Breakdown of organic compounds
  • d) Assimilation of nitrogen compounds
Q.16
Sal forest is a ..... ..... [Pb.P.M.T.1998]
  • a) Deciduous forest
  • b) Evergreen forest
  • c) Rain forest
  • d) None
Q.17
In a food chain, man is .... ..... [C.P.M.T.1993]
  • a) Primary and Secondary consumers
  • b) Primary consumers
  • c) Secondary consumers
  • d) Producers
Q.18
An easily disturbed ecosystem which can recover after some time after the stoppage of damaging factor is .... .... [C.B.S.E.2004]
  • a) Lower stability and high resilience
  • b) Lower stability and low resilience
  • c) Higher stability and high resilience
  • d) Higher stability and low resilience
Q.19
Which is false about food chain .... .... [Kerala 2011]
  • a) Grazing food chain is major conduit of energy for a aquatic ecosystem
  • b) In terrestrial ecosystem, large fraction of energy flows through detritus food chain
  • c) Primary consumers belong to first trophic level
  • d) Cockroaches and crows are omnivores
Q.20
Amount of energy transferred from one tropic level to next is .... ..... [C.P.M.T.2008]
  • a) 1.5%
  • b) 10%
  • c) 15%
  • d) 20%
Q.21
Ten percent law of energy transfer in food chain was given by .... .... [C.E.T.Chd2010]
  • a) Elton
  • b) Haeckel
  • c) Lindeman
  • d) Schimper
Q.22
Amount of alcohol allowed to be mixed with petrol in India is .... .... [C.B.S.E. 2004]
  • a) 2.5%
  • b) 5%
  • c) 10%
  • d) 5-10%
Q.23
Who proposed the concept of ecological pyramids? .... .... [C.E.T.Chd.1997]
  • a) Odum
  • b) Elements
  • c) Tansley
  • d) Elton
Q.24
Petroleum is a .... .... [C.B.S.E. 1992]
  • a) Synthetic product
  • b) Renewable resource
  • c) Nonrenewable resource
  • d) Inconvenient resources
Q.25
Most vital process for existence of life on earth is .... ..... [E.A.M.C.E.T.1999]
  • a) Reproduction of plants and animals
  • b) Respiration of animals
  • c) Photosynthesis by plants
  • d) Communication in animals
Q.26
Total amount of living material at various level of a food chain is depicated by .... .... [D.P.M.T.1999]
  • a) Pyramid of energy
  • b) Pyramid of numbers
  • c) Pyramid of biomass
  • d) All the above
Q.27
Desert biome does not support much vegetation as it lacks
  • a) Sufficient light
  • b) Favourable temperature
  • c) Sufficient water
  • d) Sufficient nutrients
Q.28
Minimum components needed for an ecosystem to survive are .... .... [D.P.M.T.2011]
  • a) Producers and primary consumer
  • b) Producers and primary carnivores
  • c) Producers and decomposers
  • d) Producers and decomposers, consumers
Q.29
Which is a non –renewable resource ? .... ..... [Kerala 2009]
  • a) Water
  • b) Forest
  • c) Mineral
  • d) Solar energy
Q.30
A food chain comprises .... .... [M.P.P.M.T.2000]
  • a) Producers, herbivores and carnivores
  • b) Producers, consumers and decomposer
  • c) Producers and primary consumers
  • d) Producers, carnivores and decomposers
0 h : 0 m : 1 s