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21.

The incorporation of minerals by microbes is called:

A.	Mineralization	B.	Humification
C.	Nutrient immobilization	D.	Microbe immobilization

22.

Carnivores are:

A.	Usually primary consumers	B.	Usually secondary consumers
C.	Usually decomposers rather than consumers	D.	Usually secondary or tertiary consumers

23.

The significance of ecosystem lies in:

A.	Flow of energy	B.	Cycling of matters
C.	Both (a) & (b)	D.	None of the above

24.

In a food chain, man is:

A.	Producer	B.	Primary consumer only
C.	Primary and Secondary consumer	D.	Secondary consumer only

25.

The first link in any food chain is a green plant because:

A.	They are widely distributed	B.	They are firmly fixed to soil
C.	They alone have the capacity to fix the atmospheric CO2 in the presence of sunlight	D.	There are more herbivorous animals than the carnivorous

26.

A food chain consists of:

A.	Producers and primary consumers	B.	Producer, herbivores and carnivores
C.	Produers, carnivores and decomposers	D.	Producers, consumers and decomposers

27.

Biophere refers to:

A.	Plants of a particular area	B.	Area occupied by living beings
C.	Plants of world	D.	Spherical plants

28.

The number of primary producers within a specified area world be maximum in:

A.	Pond ecosystem	B.	Grassland ecosystem
C.	Desert ecosystem	D.	Forest ecosystem

29.

Green plants constitute:

A.	The first trophic level	B.	The second trophic level
C.	The third trophic level	D.	The fourth trophic level

30.

Which of the following characterizes the biomass in an ecosystem?

A.	The biomass of producers is less than the combined biomass of consumers and decomposers	B.	No general statement can be made about relative biomass of different ecological groups
C.	The biomass of secondary consumers is usually greater than the biomass of primary consumers	D.	The biomass of producers is generally greater than the biomass of primary consumers