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161.

Which is the most stable ecosystem?

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

162.

To eat and being eaten relationship is called:

A.	Food chain	B.	Food web
C.	Symbiosis	D.	Phagocytosis

163.

Which of the following ecosystem has highest gross primary productivity:

A.	Grassland	B.	Coral reefs
C.	Mangroves	D.	Rain forest

164.

The living organisms of all ecosystems collectively constitute:

A.	Producers	B.	Decomposers
C.	Consumers and decomposers	D.	Biosphere

165.

Ecosystem contains:

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

166.

In natural ecosystem, decomposers include:

A.	Only two types of organisms	B.	Only two types of organisms plus macroscopic animals
C.	Only microscopic animals	D.	Only bacteria and fungi

167.

In a terrestrial ecosystem such as forest maximum energy lies in which trophic level?

A.	T1	B.	T2
C.	T3	D.	T4

168.

The main role of bacteria in the carbon cycle involves:

A.	Photosynthesis	B.	Assimilation of nitrogenous compounds
C.	Chemosynthesis	D.	Digestion or breakdown of organic compounds

169.

In an ecosystem in abiotic components which of the following occurs?

A.	Flow of energy	B.	Cycling of material
C.	Consumption of materials	D.	Flow of energy and cycling of materials

170.

The snakes are included under:

A.	Saprophytes	B.	Primary consumers
C.	Second trophic level	D.	None of these