-
question_answer1)
'Eco' term refers as
A)
Biosphere done
clear
B)
Environment done
clear
C)
Organisms done
clear
D)
Plants done
clear
View Solution play_arrow
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question_answer2)
The major characteristics of the vegetation of a locality are controlled by
A)
Man only done
clear
B)
Mainly by climate done
clear
C)
Animals only done
clear
D)
Altitude of place only done
clear
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-
question_answer3)
Ozone layer depletion or hole in ozone layer is being found in
A)
North pole done
clear
B)
South pole done
clear
C)
Russia done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer4)
The resource which regulates the flow of energy in desert ecosystem is the availability of
A)
Light done
clear
B)
Water done
clear
C)
Minerals done
clear
D)
Heat done
clear
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question_answer5)
Which of the following ecological factor exerts a direct effect
A)
pH done
clear
B)
Topography done
clear
C)
Mineral elements done
clear
D)
Humidity done
clear
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question_answer6)
Maximum water vapour which can be held in atmosphere is
A)
Relative humidity done
clear
B)
Absolute humidity done
clear
C)
Saturation point done
clear
D)
Absolute transpiration done
clear
View Solution play_arrow
-
question_answer7)
What will be the environmental consequence of 25% increase of
level in our atmosphere
A)
Direct pollution done
clear
B)
Death of all plants done
clear
C)
Death of all animals done
clear
D)
Green-house effect done
clear
View Solution play_arrow
-
question_answer8)
The average concentration of
in the atmosphere is
A)
10 ppm done
clear
B)
100 ppm done
clear
C)
300 ppm done
clear
D)
1000 ppm done
clear
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-
question_answer9)
The main aim of 'Earth Summit' organised at Brazil was
A)
To think over ozone layer depletion in stratosphere done
clear
B)
To increase oxygen in atmosphere done
clear
C)
To encourage agriculture done
clear
D)
To use solar energy done
clear
View Solution play_arrow
-
question_answer10)
Which of the following is capable of causing green house effect in the environment
A)
Nitrogen done
clear
B)
Hydrogen done
clear
C)
Ethane done
clear
D)
Methane done
clear
View Solution play_arrow
-
question_answer11)
In the environment, ozone is known for its
A)
Harmful effects done
clear
B)
Useful effects done
clear
C)
Both harmful and useful effects done
clear
D)
Inert nature done
clear
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question_answer12)
The soil organisms are
A)
Harmful to the plants growing in the soil done
clear
B)
Useful to plants growing in the soil done
clear
C)
Neither harmful nor useful to plants growing in the soil done
clear
D)
Both harmful as well as useful to plants growing in the soil done
clear
View Solution play_arrow
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question_answer13)
"Biomass" is the
A)
Dry weight of organisms done
clear
B)
Fresh weight of organisms done
clear
C)
Both are correct done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer14)
Prolonged liberal irrigation of agricultural fields is likely to create the problem of [CBSE PMT 2005]
A)
Acidity done
clear
B)
Aridity done
clear
C)
Salinity done
clear
D)
Metal toxicity done
clear
View Solution play_arrow
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question_answer15)
Constant grazing and browsing in an area may ultimately result in the formation of
A)
Dense forest done
clear
B)
Grasslands done
clear
C)
Desert done
clear
D)
Bushy vegetation done
clear
View Solution play_arrow
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question_answer16)
If all the green plants were to disappears from the earth
A)
All the animals will die done
clear
B)
Only herbivorous will die done
clear
C)
Only carnivorous will die done
clear
D)
It will not matter to any animal done
clear
View Solution play_arrow
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question_answer17)
A characteristic which enables an organism to live in an environment is called
A)
Factor done
clear
B)
Ecotype done
clear
C)
Adaptation done
clear
D)
Ecosystem done
clear
View Solution play_arrow
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question_answer18)
Which of the following factors cannot be regarded as belonging to a non-living environment
A)
Light done
clear
B)
Temperature done
clear
C)
Interspecific competition done
clear
D)
Rainfall done
clear
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question_answer19)
Of the several gases in atmosphere, plant life mostly depends upon
A)
B)
C)
Both a and b done
clear
D)
View Solution play_arrow
-
question_answer20)
Which of the following is an indirect ecological factor
A)
Temperature done
clear
B)
Soil structure done
clear
C)
Light done
clear
D)
Air done
clear
View Solution play_arrow
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question_answer21)
Humus is
A)
A mixture of clay sand and loam done
clear
B)
Heavy soil with mineral salts done
clear
C)
Organic matter of colloidal size done
clear
D)
Light soil with lime done
clear
View Solution play_arrow
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question_answer22)
The equilibrium of the species is disturbed by
A)
Overgrazing done
clear
B)
Farming done
clear
C)
Selective grazing done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer23)
Mild grazing of plants by herbivores
A)
Retards growth done
clear
B)
Arrests growth done
clear
C)
Stimulates growth done
clear
D)
Destroys vegetation done
clear
View Solution play_arrow
-
question_answer24)
'Pedology' is the study of [BHU 1979]
A)
Soil done
clear
B)
Locomotion of animals done
clear
C)
Rocks done
clear
D)
Crop diseases done
clear
View Solution play_arrow
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question_answer25)
One of the effects of dust is to cause [DPMT 1980]
A)
Opening of stomata done
clear
B)
Closure of stomata done
clear
C)
Coiling of leaves done
clear
D)
Yellowing of leaves done
clear
View Solution play_arrow
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question_answer26)
Release of phosphates and nitrates in water bodies(i.e. rivers and lakes) lead to [AIIMS 1987]
A)
Increased algae growth done
clear
B)
Increased growth of decomposers done
clear
C)
Nutrient enrichment done
clear
D)
Reduced algae growth done
clear
View Solution play_arrow
-
question_answer27)
Plants grow sparsely in arid regions of the world [CPMT 1987]
A)
Only because of high temperature done
clear
B)
Because no seeds fall on their soil done
clear
C)
Because of several factors combining together done
clear
D)
Because the soil is sandy done
clear
View Solution play_arrow
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question_answer28)
Ultraviolet radiation from sunlight cause the reaction that produce [CPMT 1982, 83; MP PMT 1988; CBSE PMT 1990]
A)
Carbon monoxide done
clear
B)
Sulphur dioxide done
clear
C)
Ozone done
clear
D)
Fluorides done
clear
View Solution play_arrow
-
question_answer29)
Maximum contribution of
is from [CBSE PMT 1989]
A)
Phytoplankton done
clear
B)
Grasslands done
clear
C)
Herbs and shrubs done
clear
D)
Dense forests done
clear
View Solution play_arrow
-
question_answer30)
Quantity of
in the atmosphere is about [MP PMT 1991; CBSE PMT 1997; RPMT 1997]
A)
0.003% done
clear
B)
0.03% done
clear
C)
0.3% done
clear
D)
3.0% done
clear
View Solution play_arrow
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question_answer31)
Which of the following gas is most harmful for plants [CPMT 1992]
A)
B)
C)
D)
View Solution play_arrow
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question_answer32)
Soil salinity is measured by [BHU 1995]
A)
Porometer done
clear
B)
Potometer done
clear
C)
Conductivity meter done
clear
D)
Calorimeter done
clear
View Solution play_arrow
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question_answer33)
Which biological factor is responsible for poor vegetation in deserts [CPMT 1993]
A)
Grazing by animals and goats done
clear
B)
Low rainfall done
clear
C)
Poor fertility of soil done
clear
D)
Native mankind done
clear
View Solution play_arrow
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question_answer34)
If carbon dioxide is withdrawn from the biosphere, which organism would first experience negative effects [MP PMT 1993]
A)
Primary producers done
clear
B)
Producers done
clear
C)
Secondary consumers done
clear
D)
Tertiary consumers done
clear
View Solution play_arrow
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question_answer35)
Which of the following is ecological energy source [Bihar 1995]
A)
Air done
clear
B)
Water done
clear
C)
Soil done
clear
D)
Sunlight done
clear
E)
Fire done
clear
View Solution play_arrow
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question_answer36)
Which of the following is a climatic factor [Pune CET 1998]
A)
Oxygen done
clear
B)
Temperature done
clear
C)
Soil structure done
clear
D)
Altitude done
clear
View Solution play_arrow
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question_answer37)
The sun loving plants are referred to as [CPMT 1998; Pb. PMT 1999]
A)
Halophytes done
clear
B)
Heliophytes done
clear
C)
Heterotrophs done
clear
D)
Sciophytes done
clear
View Solution play_arrow
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question_answer38)
If there was no
in the earth's atmosphere, the temperature of earth's surface would be [CBSE PMT 1998]
A)
Same as present done
clear
B)
Less than the present done
clear
C)
Higher than the present done
clear
D)
Dependent on the amount of oxygen in the atmosphere done
clear
View Solution play_arrow
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question_answer39)
Edaphology is the relationship between [AIIMS 1999]
A)
Plant and biosphere done
clear
B)
Animal and ecosystem done
clear
C)
Soil and living organisms done
clear
D)
Soil and biosphere done
clear
View Solution play_arrow
-
question_answer40)
Edaphic factors are related to [CPMT 1976, 2000; KCET 1994]
A)
Soil done
clear
B)
Animal done
clear
C)
Man done
clear
D)
Temperature done
clear
View Solution play_arrow
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question_answer41)
Removal of soil by the action of wind and water is known as [MP PMT 1988; JIPMER 1987; CPMT 1984]
A)
Soil erosion done
clear
B)
Soil conservation done
clear
C)
Salination done
clear
D)
Calcification done
clear
View Solution play_arrow
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question_answer42)
An area of soil is thoroughly wetted and allowed to drain until capillary movement of water stopped. The water contents of the soil will give an estimate of its [AIIMS 1980; MP PMT 1990; AFMC 1987; CPMT 1992]
A)
Capillary water done
clear
B)
Storage water done
clear
C)
Field capacity done
clear
D)
Gravitational water done
clear
View Solution play_arrow
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question_answer43)
Deforestation has an alarming effect on [DPMT 1984, 86; AIIMS 2001]
A)
Increase in grazing area done
clear
B)
Sunlight done
clear
C)
Weed control done
clear
D)
Soil erosion or desertification of habitat done
clear
View Solution play_arrow
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question_answer44)
The best soil for healthy and vigorous growth of the plant is [DPMT 1974, 83; BHU 1991; 1995]
A)
Clay done
clear
B)
Loam done
clear
C)
Sandy soil done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer45)
The pH of a fertile soil is usually around [CPMT 1977, 83, 87; MP PMT 1989; CBSE PMT 2001]
A)
2 - 3 done
clear
B)
6 - 7 done
clear
C)
8 - 10 done
clear
D)
11 - 12 done
clear
View Solution play_arrow
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question_answer46)
The components of a soil are
A)
Inorganic and organic components done
clear
B)
Water and air done
clear
C)
Livings done
clear
D)
All the above done
clear
View Solution play_arrow
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question_answer47)
Solubility and availability of plant nutrients are more related to [EAMCET 1981; BHU 1984]
A)
Soil pH done
clear
B)
Soil porosity done
clear
C)
Soil temperature done
clear
D)
Soil colour done
clear
View Solution play_arrow
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question_answer48)
Loss of upper fertile layer of soil is known as [MP PMT 1988]
A)
Pedogenesis done
clear
B)
Pedosolization done
clear
C)
Soil erosion done
clear
D)
None of the above done
clear
View Solution play_arrow
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question_answer49)
Water logging occurs in [CPMT 1990]
A)
Clay soil done
clear
B)
Loamy soil done
clear
C)
Gravel soil done
clear
D)
Sandy soil done
clear
View Solution play_arrow
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question_answer50)
Deep black soil is considered to be highly productive due to high proportion of [CBSE PMT 1991]
A)
Silt and earthworm done
clear
B)
Clay and humus done
clear
C)
D)
View Solution play_arrow
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question_answer51)
Sheet erosion is caused by [CPMT 1990]
A)
Fast running rivers done
clear
B)
Wind done
clear
C)
Heavy rains done
clear
D)
Glaciers done
clear
View Solution play_arrow
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question_answer52)
Mulching helps in [BHU 1983]
A)
Soil fertility done
clear
B)
Moisture conservation done
clear
C)
Improvement of soil structure done
clear
D)
Soil sterility done
clear
View Solution play_arrow
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question_answer53)
Soil conservation can be best achieved by having [CPMT 1988]
A)
Wind screens done
clear
B)
Good plant covers done
clear
C)
Restricted human activity done
clear
D)
Low rainfall done
clear
View Solution play_arrow
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question_answer54)
The process of laterization results into [Bihar 1989]
A)
Degradation of soil done
clear
B)
Formation of humus done
clear
C)
Mineralization of humus done
clear
D)
Formation of soil done
clear
View Solution play_arrow
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question_answer55)
Salinity of the soil is often caused due to [CPMT 1989]
A)
Accumulation of soluble minerals near or in the surface in arid region done
clear
B)
Excessive addition of water done
clear
C)
Rapid evaporation of surface water done
clear
D)
Excessive leaching done
clear
View Solution play_arrow
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question_answer56)
Insectivorous plants grow on [CPMT 1994]
A)
B)
C)
D)
View Solution play_arrow
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question_answer57)
Soil formed by transportation of disintegrated parent material from one place to another is called [Pune CET 1998]
A)
Light soil done
clear
B)
Alluvial soil done
clear
C)
Heavy soil done
clear
D)
Sedimentary soil done
clear
View Solution play_arrow
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question_answer58)
Soil erosion is greater when [Pune CET 1998]
A)
There is no rain done
clear
B)
The rainfall is low done
clear
C)
Winds do not blow done
clear
D)
The rainfall is received in heavy downpour done
clear
View Solution play_arrow
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question_answer59)
When one organism is benefitted without affecting the others is called [CPMT 1977, 83, 2000; DPMT 1984, 92]
A)
Parasitism done
clear
B)
Commensalism done
clear
C)
Saprophytism done
clear
D)
Symbiosis done
clear
View Solution play_arrow
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question_answer60)
Biotic factors are [CPMT 1981]
A)
Chemical factors of soil which affect life done
clear
B)
Physical factors of soil which affect life done
clear
C)
All living organisms which influence other organisms done
clear
D)
Factors of atmosphere which affect life done
clear
View Solution play_arrow
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question_answer61)
Which of the following is not a biotic component [MP PMT 1990]
A)
Phytoplankton done
clear
B)
Herbivores done
clear
C)
Light done
clear
D)
Bacteria done
clear
View Solution play_arrow
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question_answer62)
If the strong partner is benefitted and the weak partner is damaged, it is known as [NCERT 1980]
A)
Amensalism done
clear
B)
Symbiosis done
clear
C)
Predation done
clear
D)
Allotrophy done
clear
View Solution play_arrow
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question_answer63)
The best source of energy in the environment is [DPMT 1992]
A)
Water done
clear
B)
Soil done
clear
C)
Trees done
clear
D)
Ponds done
clear
View Solution play_arrow
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question_answer64)
Mycorrhiza, a relationship between fungi and roots of higher plants is [CPMT 1993]
A)
Parasitic relationship done
clear
B)
Saprophytic relationship done
clear
C)
Symbiotic relationship done
clear
D)
Epiphytic relationship done
clear
View Solution play_arrow
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question_answer65)
The Orobanche plant is [CPMT 1993]
A)
Partial root parasite done
clear
B)
Total root parasite done
clear
C)
Symbiont done
clear
D)
Total stem parasite done
clear
View Solution play_arrow
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question_answer66)
Which one of the following factors is biotic [CPMT 1993]
A)
Photoperiod done
clear
B)
C)
Texture and porosity of soil done
clear
D)
Rainfall done
clear
View Solution play_arrow
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question_answer67)
Which is the main causative factor of desertification [CBSE PMT 1995]
A)
Developmental activities done
clear
B)
Tourism done
clear
C)
Overgrazing done
clear
D)
Irrigated agriculture done
clear
View Solution play_arrow
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question_answer68)
Crop rotation is helpful because [CPMT 1995]
A)
It gives more nitrates in the soil done
clear
B)
It gives more sulphates in the soil done
clear
C)
It gives more nitrogen in the soil done
clear
D)
It gives more phosphorus in the soil done
clear
View Solution play_arrow
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question_answer69)
Stopage of reproduction in an organism by creating hurdle in its biology or physiology or its distruction by use of another organism is known as [CBSE PMT 1996]
A)
Predation done
clear
B)
Competition done
clear
C)
Biological control done
clear
D)
Physiological control done
clear
View Solution play_arrow
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question_answer70)
Which of the following statements is incorrect [KCET 1998]
A)
Lichen, an association of fungus and algae is an example of Mutualism done
clear
B)
Those Epiphytes which use other plants for support only and not for water or food supply are examples of Commensation done
clear
C)
Sea-anemone on hermit-crab is an example of protocooperation done
clear
D)
Mutualism, protocooperation, commensalism cannot be included under Symbiosis done
clear
View Solution play_arrow
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question_answer71)
When the organisms live together in such a manner that one organism is benifitted, while other has no effects, it is called [CPMT 1998]
A)
Commensalism done
clear
B)
Parasitism done
clear
C)
Mutualism done
clear
D)
All of the above done
clear
View Solution play_arrow
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question_answer72)
Territoriality occurs as a result of [AFMC 1999; BVP 2000; Pb. PMT 2004]
A)
Parasitism done
clear
B)
Predation done
clear
C)
Co-operation done
clear
D)
Competition done
clear
View Solution play_arrow
-
question_answer73)
In an aqueous environment, the microscopic animals are collectively called [CPMT 1985; MP PMT 1999; CBSE PMT 2001]
A)
Herbivores done
clear
B)
Carnivores done
clear
C)
Planktons done
clear
D)
Fauna and flora done
clear
View Solution play_arrow
-
question_answer74)
Soil is a mixture of [Pb. PMT 2000]
A)
Sand and clay done
clear
B)
Sand and humus done
clear
C)
Clay and humus done
clear
D)
Sand, clay and humus done
clear
View Solution play_arrow
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question_answer75)
Clay soil is obtained [Pb. PMT 2000]
A)
In desert done
clear
B)
Around ponds done
clear
C)
On seashore done
clear
D)
On rocks done
clear
View Solution play_arrow
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question_answer76)
A bird enters the mouth of crocodile and feed on parasitic leeches. The bird gets food and crocodile gets ribs of blood sucking leeches. Both the partners can live independently. Such an association is [BHU 2001]
A)
Mutualism done
clear
B)
Amensalism done
clear
C)
Commensalism done
clear
D)
Protocooperation done
clear
View Solution play_arrow
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question_answer77)
Ozone hole means [AFMC 2001]
A)
Hole in the stratosphere done
clear
B)
Same concentration of ozone done
clear
C)
Decrease in concentration of ozone done
clear
D)
Increase in the concentration of ozone done
clear
View Solution play_arrow
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question_answer78)
Which of the following soil is transported by air [CPMT 2002]
A)
Alluvial done
clear
B)
Aerial done
clear
C)
Elluvial done
clear
D)
Glacial done
clear
View Solution play_arrow
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question_answer79)
Surface water of lake enrich in having [AFMC 2003]
A)
Organic substance done
clear
B)
Minerals done
clear
C)
Inorganic substance done
clear
D)
Pollutants done
clear
View Solution play_arrow
-
question_answer80)
Which one of the following is a right matching pair of certain organism(s) and the kind of association [AIIMS 2003]
A)
Shark and sucker fish-Amensalism done
clear
B)
Algae and fungi in lichens-Mutualism done
clear
C)
Orchids growing on trees-Parasitism done
clear
D)
Cuscuta (dodder) growing in other flowering plants-epiphytism done
clear
View Solution play_arrow
-
question_answer81)
Ozone saves the biosphere by absorbing the high energy radiation called [Kerala CET 2003]
A)
Infra-red (IR) done
clear
B)
Ultraviolet ray (UV) done
clear
C)
X-ray done
clear
D)
Gama rays done
clear
View Solution play_arrow
-
question_answer82)
Humus is found in [CPMT 2003]
A)
Top portion of soil done
clear
B)
Middle portion of soil done
clear
C)
Deep portion of soil done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer83)
Humus is important for plant growth because [BVP 2003]
A)
It is partially decomposed done
clear
B)
It is derived from leaves done
clear
C)
It is rich in nutrients and increases the water holding capacity of soil done
clear
D)
It is made up of dead organic matter done
clear
View Solution play_arrow
-
question_answer84)
The possible beneficial effect of grazing animals is the [BVP 2003]
A)
Removal of wild animals done
clear
B)
Eradication of weeds done
clear
C)
Removal of wild plants done
clear
D)
Addition of their excrete to the soil done
clear
View Solution play_arrow
-
question_answer85)
In commensalism [MP PMT 2004]
A)
Both partners are benefitted done
clear
B)
Both partners are harmed done
clear
C)
Weaker is benefitted while stronger is unharmed done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer86)
The instrument which measures wind velocity is [MP PMT 2004]
A)
Lactometer done
clear
B)
Anemometer done
clear
C)
Hydrometer done
clear
D)
Barometer done
clear
View Solution play_arrow
-
question_answer87)
In which one of the following pairs is the specific characteristic of a soil not correctly matched [CBSE PMT 2004]
A)
Chernozems - Richest soil in the world done
clear
B)
Black soil - Rich in calcium carbonate done
clear
C)
Laterite - Contains aluminium compound done
clear
D)
Terra rossa - Most suitable for roses done
clear
View Solution play_arrow
-
question_answer88)
Acclimatization is [MHCET 2004]
A)
Pure-line breeding done
clear
B)
Pure-line selection done
clear
C)
Introduction done
clear
D)
Adaptation to new environment done
clear
View Solution play_arrow
-
question_answer89)
If the high altitude birds become rare or extinct, the plants which may disappear along with them are [AIIMS 2004]
A)
Pine done
clear
B)
Oak done
clear
C)
Orchids done
clear
D)
Rhododendrons done
clear
View Solution play_arrow
-
question_answer90)
Which is not a part of atmosphere [MP PMT 2005]
A)
Light done
clear
B)
Temperature done
clear
C)
Edaphic factor done
clear
D)
Precipitation done
clear
View Solution play_arrow
-
question_answer91)
An association of two species where both the partners derive mutual benefit from each other is [HP PMT 2005]
A)
Parasitism done
clear
B)
Symbiosis done
clear
C)
Commensalism done
clear
D)
Predation done
clear
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question_answer92)
Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as [BHU 2005]
A)
Symbiosis done
clear
B)
Commensalism done
clear
C)
Predation done
clear
D)
Parasitism done
clear
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