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151.

Effect of pollutionis first and most marked on:

A.	Natural balance of our ecological environment	B.	Natural gaseous cycle
C.	Natural geochemical cycle	D.	Natural flora of a place

152.

Which of the following is the use of lichens in case of pollution?

A.	They treat the polluted water	B.	They act as bio-indicators of pollution
C.	They promote pollution	D.	Lichens are not related with pollution

153.

Minimata disease was caused due to the consumption of:

A.	Sea food containing lot of cadmium	B.	Fish contaminated with mercury
C.	Oysters with lot of pesticide	D.	Sea food contaminated with selenium

154.

Presence of SO2 in atmosphere is indicated by:

A.	Mosses	B.	Liver worts
C.	Lichens	D.	Ferms

155.

The maximum biomagnification would be in which of the following in case of aquatic ecosystem?

A.	Fishes	B.	Birds
C.	Zooplanktons	D.	Phytophanktons

156.

The toxic effect of carbon monoxide is due to its greater affinity for haemoglobin as compared to oxygen by (appro.)

A.	20 times	B.	100 times
C.	2 times	D.	200 times

157.

Biological control component is central to advanced agriculture production. Which of the following is used as a third generation pesticide?

A.	Pathogens	B.	Pheromones
C.	Insect repellant	D.	Insect hormone analogue

158.

Measurement of the rate of O2 consumption in unit volume of water over a period of time is done to find out:

A.	Biogas generation	B.	Biological oxygen demand
C.	Biosynthetic path way	D.	Fermentation

159.

The supersonic jets cause pollution by thining of:

A.	O3 layer	B.	SO2 layer
C.	O2 Layer	D.	CO2 layer

160.

Green house effect refers to:

A.	Cooling of earth	B.	Traping UV rays
C.	Production of cereals	D.	warming of earth