Birth rate under ideal conditions is known as
mortality
natality
both and
none of these
Correct Answer :
B. natality
Related Questions
The most widespread form of symbiosis in nature is
mutualism
commensalism
predatism
parasitism
The term "ecosystem" was first proposed by
A.G. Tansely
H.T. Odum
Karl Mobius
None of these
The source of energy in an ecosystem is
light received from sun
heat liberated during respiration
heat liberated during fermentation
none of these
Synecology is the study of
community in relation to environment
individuals
environment
water
An association between two or more species in which both are benefited is known as
commensalism
symbiosis
mutualism
cooperation
In an ecosystem the population of
primary producers is larger than that of primary consumers
secondary consumers is the largest because they are most powerful
primary consumers is the least dependent upon primary producers.
primary consumers outnumber primary producers
Animals which live at the bottom of the sea are called
leutic
benthic
pelagic
none of these
A food-chain consists of
producer only
producers and consumers
consumers only
decomposers only
Trophic levels are formed by
plants only
animals only
carnivorous animals only
organisms linked in food-chains
Gas liberated in Bhopal gas tragedy was
methyl isocyanide
phenyl isocyanide
ethylene
acetylene
Association of a sea-anemone with hermit crab living in a gastropod shell is an example of
mutualism
commensalism
symbiosis
parasitism
Which of the following is normally not an important atmospheric pollutant
CO
Hydro-carbon
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
The first fish that eats upon the planktonic form is
carnivore
primary consumer
secondary consumer
decomposers
The transitional zone where two different types of communities meet is called the
Ecotype
Littoral
Ecotone
Both and
Birth rate under ideal conditions is known as
mortality
natality
both and
none of these
A pond is
a biome
a natural ecosystem
an artificial ecosystem
a community of plants and animals
Desert animals are called
arboreal
cursorial
benthos
xeric
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
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
When compared to the trophic level above, the total energy present in any given trophic level is necessarily
greater
lesser
the same
very small
Which one is the direct ecological factor ?
Soil structure
Wind
Temperature
Climate
Plants growing on sea shores show characters of
hydrophytes
mesophytes
xerophytes
halophytes
Some animals have a constant high body temperature. This is because
they like this temperature
they can work fast in the temperature
they prefer to live in cold region
they are active animals
An organism which lives at the expense of another organism is called
predator
prey
host
parasite
The total set of feeding relationships in a biotic community is called
a food chain
trophic levels
food webs
ecosystem
All the living organisms on earth constitute
biome
biosphere
community
population
Trophic levels are formed by
plants only
animals only
organisms linked in food chains
all of these
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
Which of the following atmospheric pollutants is not produced by the exhaust of motor vehicles in Delhi
Fly ash
Hydrocarbon gases
CO