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11.

Pond is an example of:

A.	Artificial ecosystem	B.	Forest ecosystem
C.	Natural ecosystem	D.	Grassland ecosystem

12.

The term biosphere is used for the zone of earth where life exists:

A.	On the lithosphere surface	B.	In the hydrosphere
C.	In the lithosphere, hydrosphere and atmosphere	D.	In the lithosphere and hydrosphere

13.

In an aquatic environment, microscopic animals and plants are collectively known:

A.	Commensals	B.	Herbivores
C.	Fauna and flora	D.	Planktons

14.

Ecosystem may be defined as:

A.	Group of plants, which act as the energy suppliers	B.	Group of organisms which form population
C.	Functional unit for ecological studies	D.	None of these

15.

The earth could have sustained more population if all the people would have been:

A.	Pure vegetarians	B.	Milk drinker and vegetarian
C.	Non-vegetarians	D.	Dependent upon milk, egg and vegetarian habit

16.

Prairies and steppes are parts of the natural regions called:

A.	Temperate grasslands	B.	Tropical grasslands
C.	Prairie grasslands	D.	Steppes grasslands

17.

Which of the following habitats is most unsuitable for primary productivity:

A.	Meadow	B.	Forested river bank
C.	Cave	D.	Pond

18.

The pyramid that cannot be inverted in a stable ecosystem is the pyramid of:

A.	Energy	B.	Number
C.	Biomass	D.	All of these

19.

Nepenthes is a :

A.	Primary producer	B.	Consumer
C.	Primary producer and consumer	D.	None of the above

20.

The minimum number of components required for an ecosystem to survive:

A.	Producer and primary consumer	B.	Producer and decomposer
C.	Primary consumer and decomposer	D.	Primary and secondary consumer
E.	Producer and secondary consumer