CBSE
Multiple Choice QuestionsLiving in same habitat organisms of same species from:
biosphere
community
population
niche
By anaerobic process, the cow dung is used to produce :
methane
butane
ethane
propane
Ratio between mortality and natality is called
population ratio
vital index
census ratio
density coefficient
As insecticides reach at higher trophic level in food chain their concentration :
increases
become irregular
remain constant
decreases
The organisms that thrives on the remains of dead plants and animals are categorised as
carnivore
omnivore
scavangers
predators
The term 'ecosystem' was coined by :
E.P. Odum
A.G. Tansley
Carl Mobious
W. Clementus
Grassland with scattered trees is :
savanna
deciduous forest
evergreen forest
tropical rain forest
A food web is more realistic than food chain for showing the feeding relationship in an ecosystem because
it compares the number of consumers to the number of microorganisms in an ecosystem
food chains use only a small sampling of organisms
a food web explains why there are more producers than consumers
producers are usually eaten by many different consumers and most consumers are eaten by more than one predator
The biomass pyramid of forest ecosystem is
linear
inverted
tetra angle
upright
Which of the following is false?
The energy content in a trophic level is determined by considering individuals of a species in that trophic level
The succession that occur in newly cooled lava is called primary success
Rate of succession is faster in secondary succession
Quantity of biomass in a trophic level at a particular period is called as stop-(standing) crop
