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181.

Which ecosystem has the highest primary productivity?

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

182.

In food chain, herbivores are:

A.	Producer	B.	Primary consumer
C.	Secondary consumers	D.	Decomposers

183.

In an upright pyramid of biomass, the herbivores occupy the position:

A.	4	B.	2
C.	3	D.	1

184.

The flora and fauna in lakes and ponds represents:

A.	Lentic biota	B.	Latic biota
C.	Abiotic	D.	None of these

185.

Relative biological effectiveness (RBE) is usually referred to damages caused by:

A.	Pollution	B.	High temperature
C.	Low temperature	D.	Radiation

186.

If phytoplanktons are destroyed from sea, then:

A.	Algae will get more grow luxuriantly	B.	Primary consumers will grow
C.	Food chain will be effected	D.	No effect will be seen

187.

When the number of organisms at successive levels are plotted, they assume the space of a pyramid. This is called the pyramid of:

A.	Energy	B.	Number
C.	Biomass	D.	Both (a) and (c)

188.

Ten per cent law of energy transfer, in a food chain was enunciated by:

A.	Elton	B.	Heackel
C.	Lindeman	D.	Schimper

189.

Which part of the pond ecosystem does not affect by the temperature:

A.	Epilimnion	B.	Metalimnion
C.	Hypolimnion	D.	All of the above

190.

The rate of storage of food energy at consumer level is called:

A.	Secondary productivity	B.	Primary productivity
C.	Gross productivity	D.	Net productivity