"Complete competitors cannot coexist" is true for
1.Primary succession
2.Secondary succession
3.Competitive exclusion
4.Character displacement
Posted Date:-2021-06-20 06:41:56
A renewable exhaustible natural resource is
1.Petroleum
2.Coal
3.Forests
4.Minerals
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An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having
1.High stability and high resilience
2.Low stability and low resilience
3.High stability and low resilience
4.Low stability and high resilience
Posted Date:-2021-06-20 06:41:56
Bell-shaped polygonal pyramid indicates
1.Low percentage of young individuals
2.Moderate percentage of young individuals
3.High percentage of young individuals
4.Low percentage of old individuals
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Community is
1.Species structure and diversity index of an area
2.Biomass
3.Autotrophic and heterotrophic components
4.All of these
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Competition is severe in a population that has a distribution which is
1.Uniform
2.Random
3.Non-random
4.Irregular
Posted Date:-2021-06-20 06:41:56
Identify the possible link "A" in the following food chain: Plant → insect → frog → "A" → Eagle
1.Parrot
2.Rabbit
3.Cobra
4.Wolf
Posted Date:-2021-06-20 06:41:56
In a population, if the rate of addition of new members is higher than the rate of individuals lost, it shows
1.Exponential growth
2.Declined growth
3.Zero population growth
4.none of these
Posted Date:-2021-06-20 06:41:56
In an aquatic ecosystem, the trophic level equivalent to cows in grasslands is
1.Zooplankton
2.Phytoplankton
3.Benthos
4.Nekton
Posted Date:-2021-06-20 06:41:56
In an ecosystem Biotic factors affect the survival of an organism in that ecosystem. They include
1.competition for food and water
2.competition for shelter
3.co-operation to help find food
4.All of the above
Posted Date:-2021-06-20 06:41:56
In ecological succession from pioneer to climax community, the biomass shell
1.No relation
2.Increase and then decrease
3.Decrease
4.Increase continuously
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Individuals of a species which occur in a particular area constitute
1.Fauna
2.Population
3.Flora
4.Flora and Fauna
Posted Date:-2021-06-20 06:41:56
Information about birth rate, death rate, sex ratio, age distribution etc. of a population is obtained from
1.Mortality rate
2.Life table
3.Natality table
4.Both (A) and (C)
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Insectivorous plants are adopted to soils
1.Deficient in nitrogenous compounds
2.Deficient in water
3.Rich in water
4.Deficient in trace elements
Posted Date:-2021-06-20 06:41:56
Carbon dioxide is called green-house gas because it is
1.Transparent to sunlight but traps heat
2.Transparent to heat but traps sunlight
3.Used in green-house to increase plant growth
4.Transparent to both sunlight and heat
Posted Date:-2021-06-20 06:41:56
Large Woody Vines are more commonly found in
1.Alpine forests
2.Temperate forests
3.Mangroves
4.Tropical rainforests
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Lead is one of the most serious environmental pollutants which affects
1.Water
2.Soil
3.Air
4.Noise
Posted Date:-2021-06-20 06:41:56
lf there was no CO2 in the atmosphere, the earth temperature would be
1.Less than the present
2.Same as present
3.Higher than the present
4.Dependent on O2 content of air
Posted Date:-2021-06-20 06:41:56
Lichens indicate pollution by
1.Ozone
2.SO2
3.NO3
4.CO
Posted Date:-2021-06-20 06:41:56
Major aerosol pollutant present in the jet plane emission is
1.Carbon monoxide
2.Carbon tetrachloride
3.Chlorofluorocarbon
4.Sulphur dioxide
Posted Date:-2021-06-20 06:41:56
Maximum deposition of DDT will occur in
1.Phytoplankton
2.Crab
3.Eel
4.Sea gull
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Maximum threat to the world is from
1.Global warming
2.Ozone hole
3.Water pollution
4.Soil erosion
Posted Date:-2021-06-20 06:41:56
Minamata disease is due to pollution of
1.Industrial waste mercury into fishing water
2.Oil spill in water
3.Organic waste into drinking water
4.Arsenic into the atmosphere
Posted Date:-2021-06-20 06:41:56
Montreal Protocol aims at
1.Control of CO2 emission
2.Reduction of ozone depleting substances
3.Biodiversity conservation
4.Control of water pollution
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Most abundant water pollutant is
1.Industrial wastes
2.Pesticides
3.Detergents
4.Ammonia
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Most harmful environmental pollutants are
1.Natural nutrients in excess
2.Human organic wastes
3.Nonbiodegradable chemicals
4.Waste animal feed
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Organisms that can tolerate and thrive in a wide range of temperatures are called
1.Eukaryotic organisms
2.Stenothermal
3.Eurythermal
4.None of these
Posted Date:-2021-06-20 06:41:56
Pheromones, the chemical messengers produced by certain exocrine glands of skin, affect
1.Skin color
2.Breast
3.Genitalia
4.Mutual behaviour of members of a species
Posted Date:-2021-06-20 06:41:56
Plant succession occurring in a sandy area is
1.Xerosere
2.Halosere
3.Psammosere
4.Hydrosere
Posted Date:-2021-06-20 06:41:56
The age of pyramid with broad base indicates
1.High percentage of old individuals
2.Low percentage of young individuals
3.High percentage of young individuals
4.Low percentage of old individuals
Posted Date:-2021-06-20 06:41:56
The atmosphere of big metropolitan cities is polluted most by
1.Automobile exhausts
2.Radio-active fall out
3.Household waste
4.Pesticides residue
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The final stable community in ecological succession is
1.Climax
2.Sere
3.Pioneers
4.Carnivores
Posted Date:-2021-06-20 06:41:56
The maximum amount of water that a soil can hold, by capillary action is called
1.Wilting point
2.Water potential
3.Osmotic potential
4.Field capacity
Posted Date:-2021-06-20 06:41:56
The role of an organism in the ecological system is known as
1.Niche
2.Habitat
3.Herbivory
4.Interaction
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The slow rate of decomposition of fallen logs in nature is due to their:
1.Poor nitrogen content
2.Low moisture content
3.Anaerobic environment around them
4.Low cellulose content
Posted Date:-2021-06-20 06:41:56
The type of ecosystem with the highest mean plant productivity is
1.Tropical rain forest
2.Temperate grassland
3.Desert
4.Tundra
Posted Date:-2021-06-20 06:41:56
The ultraviolet radiations in the stratosphere are absorbed by
1.SO2
2.Oxygen
3.Ozone
4.Argon
Posted Date:-2021-06-20 06:41:56
The upright pyramid of number is absent in
1.Graasland
2.Pond
3.Lake
4.Forest
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Trichoderma harzianum has proved a useful microorganism for:
1.Reclamation of wastelands
2.Bioremediation of contaminated soils
3.Biological control of soil-borne plant pathogens
4.Gene transfer in higher plants
Posted Date:-2021-06-20 06:41:56
Trophic levels in ecosystem is formed by :
1.only herbivores
2.Only bacteria
3.only plants
4.Organisms linked in food chain
Posted Date:-2021-06-20 06:41:56
Ultra-violet light causes
1.Photodynamic action
2.Sticky metaphases
3.Formation of pyrimidines
4.Destruction of hydrogen bonds between complementary DNA strands
Posted Date:-2021-06-20 06:41:56
Which factor of ecosystem includes plants, animals and microorganisms?
1.Biotic factors
2.Direct factors
3.Indirect factors
4.Abiotic factors
Posted Date:-2021-06-20 06:41:56
Which of the environmental pollutions can cause birth defects?
1.Smog
2.SO2
3.CO
4.Radioactivity
Posted Date:-2021-06-20 06:41:56
Which of the following pollutants is discharged by jet planes?
1.Photo-chemical oxidants
2.Frog
3.Smog
4.Aerosols
Posted Date:-2021-06-20 06:41:56
Which of the followings take part in symbiosis of lichen?
1.Fungus-Fungus
2.Alga-Alga
3.Alga-Fungus
4.Fungus-Gymnosperm
Posted Date:-2021-06-20 06:41:56
Which one of the following ecosystem types has the highest annual net primary productivity?
1.Tropical deciduous forest
2.Tropical rain forest
3.Temperate deciduous forest
4.Temperate evergreen forest
Posted Date:-2021-06-20 06:41:56
Which one of the following is not a bioindicator of water pollution
1.Blood-worms
2.Sludge-worms
3.Sewage fungus
4.Stone flies
Posted Date:-2021-06-20 06:41:56
Which one of the following is not a functional unit of an ecosystem?
1.Productivity
2.Stratification
3.Energy flow
4.Decomposition
Posted Date:-2021-06-20 06:41:56
Which one of the following is not a gaseous biogeochemical cycle in ecosystem?
1.Nitrogen cycle
2.Carbon cycle
3.Sulphur cycle
4.Phosphorus cycle
Posted Date:-2021-06-20 06:41:56
Which one of the following is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming?
1.CO2 40%,CFCs 30%
2.CFCs 14%, Methane 20%
3.Methane 20%, N2O 18%
4.N2O 6%, CO2 86%
Posted Date:-2021-06-20 06:41:56