In a pond ecosystem, diatoms are
decomposers
primary producers
primary consumers
secondary consumers
Trophic level in an ecosystem represents the
water level
energy level
salt level
oxygen
Soot and hydrocarbons from industries may cause
blood pressure
cancer
tuberculosis
diphtheria
An ecosystem is a natural unit of
ecosphere
biosphere
lonosphere
all the above
Algal Phytoplankton are
Volvox
Euglena
Both a and b
none of the above
Stagnant water is seen in
ponds
lakes
both a and b
none of these
Study of physical, chemical and biological aspects of fresh water is called
hydrology
oceanography
limnology
genetics
Which of the following represent a parabiosphere?
Open sea
River
Forest
Polar ice cap
Gas used for killing bacteria in water is
nitrogen
carbondioxide
chlorine
helium
Interaction between cow and lion is called
intraspecific
interspecific
intergeneric
all of the above
