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151.

Which one of the following pairs is a sedimentary type of biogeochemical cycle?

A.	Oxygen and nitrogen	B.	Phosphorus and sulphur
C.	Phosphorus and CO2	D.	Phosphours and nitrogen

152.

Which one of the following elements is the critical limiting factors in the function of ecosphere because of its irretrievable loss in the ocear:

A.	Fe	B.	P
C.	Mg	D.	Ca

153.

In desert grasslands, which type of animals are relatively more abundant?

A.	Diurnal	B.	Arboreal
C.	Aquatic	D.	Fossorial

154.

In which of the following there is no difference?

A.	Primary carnivore and trophic level II	B.	Secondary consumers and herbivores
C.	Primary consumers and herbivores	D.	Trophic level I and herbivores

155.

In an ecosystem, bacteria are considered as:

A.	Microconsumers	B.	Secondary consumers
C.	Primary consumers	D.	None of these

156.

In a biotic community, primary consumers are:

A.	Herbivores	B.	Detrivores
C.	Carnivores	D.	Omnivores

157.

The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem's:

A.	Net primary productivity	B.	Gross secondary productivity
C.	Net secondary productivity	D.	Gross primary productivity

158.

Biological equilibrium is found among the:

A.	Producers and consumers	B.	Producers and decomposers
C.	Producers, consumers and decomposers	D.	Producers and light

159.

The number of individuals of a species in a particular ecosystem at a given constant due to:

A.	Man	B.	Parasites
C.	Predators	D.	Available food

160.

The pyramid of number around a tree would be:

A.	Straight	B.	Horizontal
C.	Inverted	D.	Indefinite