EASY
Earn 100

Biochemical Oxygen Demand (BOD) in a river water

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Important Questions on Environmental Issues

EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
In an area where DDT has been used extensively, the population of birds declined significantly because -
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
A lake which is rich in organic waste may result in
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
The biomagnification of which pollutant causes a decline in the bird population?
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
The minimum proportion of impurities that made the drinking water unfit for human consumption is____________
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
A river with an inflow of domestic sewage rich in organic waste may result in:
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Biology>Ecology>Environmental Issues>Water Pollution and its Control
The maximum concentration of harmful chemicals is expected to be found in organisms
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Biology>Ecology>Environmental Issues>Water Pollution and its Control
One of the following is called as 'Terror of Bengal'.
MEDIUM
Biology>Ecology>Environmental Issues>Water Pollution and its Control
Rachel Carson's famous book ''Silent Spring'' is related to:
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
An increase in the concentration of the toxicant at successive trophic levels is known as:
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Biology>Ecology>Environmental Issues>Water Pollution and its Control
Eutrophication of water bodies leading to killing of fishes is mainly due to non-availability of
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
Which of the following is called the ‘Terror of Bengal’
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from
HARD
Biology>Ecology>Environmental Issues>Water Pollution and its Control
Match the items given in Column I with those in Column II and select the correct option given below:
 
  Column – I   Column –II
a. Eutrophication i. UV-B radiation
b. Sanitary landfill ii. Deforestation
c. Snow blindness iii. Nutrient
d. Jhum cultivation iv. Waste disposal
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
Which ONE of the following can NOT cause eutrophication of lakes?
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
Crop rotation with legume or grass pasture to improve soil structure and fertility is called,
EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
Match the following
  Pollutant   Control
(A) Particulates (I) Catalytic converters
(B) Emissions of automobiles (II) Incinerators
(C) Sulphur dioxide (III) Electrostatic precipitator
(D) Hospital wastes (IV) Cooling towers
    (V) Scrubbers

The correct match is

HARD
Biology>Ecology>Environmental Issues>Water Pollution and its Control

Match the following:

List-1 List-2
A) Global warming
B) Eutrophication
C) Biomagnification
D) Ozone depletion		 I) Mercury
II) UV-B rays
III) Methane
IV) Algal blooms
V) Terror of Bengal

The correct match is:

EASY
Biology>Ecology>Environmental Issues>Water Pollution and its Control
The highest DDT concentration in aquatic food chain shall occur in
HARD
Biology>Ecology>Environmental Issues>Water Pollution and its Control
Explain in brief the biogas production process with the help of a labelled figure.
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Biology>Ecology>Environmental Issues>Water Pollution and its Control
The high value of BOD (Biochemical Oxygen Demand) indicates that: