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171.

Food levels in an ecosystem are called:

A.	Trophic levels	B.	Consumer levels
C.	Producer levels	D.	Herbivores levels

172.

Which of the following has the largest amount of energy?

A.	Producers	B.	Primary consumers
C.	Secondary consumers	D.	Disinfactants

173.

The term 'bio-coenosis' was coined by:

A.	Tansley	B.	Warming
C.	Carl Mobius	D.	S.C.Pandya

174.

Trophic levels are formed by:

A.	Only plants	B.	Only animals
C.	Only carnivores	D.	Organisms linked in food chains

175.

Biotic components of an ecosystem include:

A.	Producers only	B.	Consumers only
C.	Producers and Consumers only	D.	Producers, consumers and decomposers

176.

Which is the most stable ecosystem?

A.	Mountain	B.	Desert
C.	Forest	D.	Ocean

177.

The greatest biomass of autotrophs in the world's oceans is that of:

A.	Benthic brown algae, coastal red algae and dephnids	B.	Benthic diatoms and marine viruses
C.	Sea-grasses and slime-moulds	D.	Free-floating microalgae, cyanobacteria and nanoplankton

178.

Which are the biotic components of forest ecosystem?

A.	Producers	B.	Decomposers
C.	Consumers	D.	All of the above

179.

Energy enters into the ecosystem through:

A.	Herbivores	B.	Carnivores
C.	Producers	D.	Decomposers

180.

The part of earth in which life exists is known as:

A.	Lithosphere	B.	Biosphere
C.	Atmosphere	D.	Hydrosphere