Biological equilibrium is equilibrium among the
producers
producers and consumers
decomposers and producers
producers, consumers and decomposers
Correct Answer :
D. producers, consumers and decomposers
Related Questions
One always finds many more of the prey species than of the predator. This is called a
food web
pyramid of numbers
pyramid of succession
none of these
Which of the following is an anti-forest conservation activity ?
Economy in timbering
Clear falling of trees
Prevention of fibres
Preservation of wild animals
Strontium- 90 can cause
lung diseases
bone cancer
leukaemia
skin cancer
The total set of feeding relationships in a biotic community is called
a food chain
trophic levels
food webs
ecosystem
Animals in cold regions have fur because
hair is a good insulating material
hairs trap air which acts as insulator
they like fur
none of these
The total interacting animals and plants in any well defined area which as field or a pond is known as
biosphere
biome
community
ecosystem
All the living organisms on earth constitute
biome
biosphere
community
population
When a big fish eats a small fish, which eats water fleas supported by phyto-plankton, the water-fleas are
producers
primary consumers
secondary consumers
top consumers in the food-chain
Synecology is the study of
community in relation to environment
individuals
environment
water
Acid rain is
limited to industrial areas
presence of large quantity of SO^2 in the atmosphere
a natural phenomenon
presence of CO^2 in the atmosphere
In a food-chain, the saprophytic organisms are
producers
consumers
predators
decomposers
The term "ecosystem" was first proposed by
A.G. Tansely
H.T. Odum
Karl Mobius
None of these
Silent valley of Kerala is preserved because
it contains timber trees
it harbours lions
it harbours elephants
it contains rare animals and plants
The soils transported by water are called
peat
alluvial
colluvial
none of these
Gas liberated in Bhopal gas tragedy was
methyl isocyanide
phenyl isocyanide
ethylene
acetylene
Trophic levels are formed by
plants only
animals only
organisms linked in food chains
all of these
Association of a sea-anemone with hermit crab living in a gastropod shell is an example of
mutualism
commensalism
symbiosis
parasitism
The source of energy in an ecosystem is
light received from sun
heat liberated during respiration
heat liberated during fermentation
none of these
The transitional zone where two different types of communities meet is called the
Ecotype
Littoral
Ecotone
Both and
Bio tic factors are
chemical factors of soil which affect life
physical factors of soil which affect life
all living organisms which influence other organisms
factors of atmosphere which affect life
Which of the following atmospheric pollutants is not produced by the exhaust of motor vehicles in Delhi
Fly ash
Hydrocarbon gases
CO
The energy storage of consumer level is called
gross primary productivity
net primary productivity
secondary productivity
none of these
Smog is a combination of
air and water
water and smoke
smoke and fog
fire and water
A food-chain consists of
producer only
producers and consumers
consumers only
decomposers only
Biome is
a part of the earth and its atmosphere which inhabits livings organisms
a community of organisms interacting with each other
the fauna and flora on land
the fauna and flora on ocean
An organism which lives at the expense of another organism is called
predator
prey
host
parasite
Plants growing on sea shores show characters of
hydrophytes
mesophytes
xerophytes
halophytes
Birth rate under ideal conditions is known as
mortality
natality
both and
none of these
Ultra-violet radiation from sunlight causes the reaction that produce
CO
Fluorides
Species that occur in different geographical regions separated by special barriers are
Allopatric
Autogenic
Sympatric
Allogenic