Association of a sea-anemone with hermit crab living in a gastropod shell is an example of
mutualism
commensalism
symbiosis
parasitism
Correct Answer :
B. commensalism
Related Questions
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
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
All the living organisms on earth constitute
biome
biosphere
community
population
Biological equilibrium is equilibrium among the
producers
producers and consumers
decomposers and producers
producers, consumers and decomposers
When compared to the trophic level above, the total energy present in any given trophic level is necessarily
greater
lesser
the same
very small
The total set of feeding relationships in a biotic community is called
a food chain
trophic levels
food webs
ecosystem
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
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 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
Which of the following is an anti-forest conservation activity ?
Economy in timbering
Clear falling of trees
Prevention of fibres
Preservation of wild animals
The whale is
primary producer
carnivorous secondary consumer
herbivorous
a decomposers
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
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
The total interacting animals and plants in any well defined area which as field or a pond is known as
biosphere
biome
community
ecosystem
The transitional zone where two different types of communities meet is called the
Ecotype
Littoral
Ecotone
Both and
The main cause of soil erosion in India is
drought
heavy rainfall
deforestation
heavy winds
Ultra-violet radiation from sunlight causes the reaction that produce
CO
Fluorides
Which of the following is normally not an important atmospheric pollutant
CO
Hydro-carbon
The most polluted city in the world is
Tokyo
New York
Calcutta
Mexico
Gas liberated in Bhopal gas tragedy was
methyl isocyanide
phenyl isocyanide
ethylene
acetylene
Strontium- 90 can cause
lung diseases
bone cancer
leukaemia
skin cancer
Synecology is the study of
environment
individual
specific species
plant community
The term "ecosystem" was first proposed by
A.G. Tansely
H.T. Odum
Karl Mobius
None of these
The soils transported by water are called
peat
alluvial
colluvial
none of these
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
Animals which live at the bottom of the sea are called
leutic
benthic
pelagic
none of these
A pond is
a biome
a natural ecosystem
an artificial ecosystem
a community of plants and animals
Which one is the direct ecological factor ?
Soil structure
Wind
Temperature
Climate
Birth rate under ideal conditions is known as
mortality
natality
both and
none of these