Which one of the following weeds is effective in controlling water pollution caused by industrial effluents?

Which of the following aquatic plant is effective in preventing the water-pollution caused by industrial waste?

A

Water Hyacinth

B

Elephant Grass

C

Parthenium

D

B and C

Air pollution caused by industrial fumes "has" been studied for years, "but " only recently "has" the harmful effects of noise pollution "become" known.

A

1

B

2

C

3

D

4

the weeds that I should do something about" means

A

the graden should be cleared off weeds

B

the weeds have to be watered

C

the weeds should be pruned

D

the weeds should be looked be looked after

Sea weeds are important source of

A

Fluorine

B

Chlorine

C

Bromine

D

Iodine

Sea weeds are an important source of

A

Fluorine

B

Chlorine

C

Bromine

D

Iodine

Some people in Manipur live in houses bunt on floating islands of weeds and decaying vegetation held together by suspended slit. These islands are called

A

Tipis

B

Barkhans

C

Phoomdis

D

Izba

The most effective method of controlling S.I. engine exhaust emission is by

A

Recirculating exhaust

B

Using catalytic converter

C

Using some additives in the fuel

D

None of these

Which of the following processes is involved in the biochemical treatment of sewage effluents?

A

Oxidation

B

Reduction

C

Dehydration

D

Fermentation

The biochemical treatment of sewage effluents is essentially a process of

A

Oxidation

B

Dehydration

C

Reduction

D

Alkalinization

The biochemical treatment applied to sewage effluents is a process of

A

Dehydration

B

Reduction

C

Oxidation

D

Polymerisation

Which one of the following weeds is effective in controlling water pollution caused by industrial effluents?

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