Environmental Issues

NEET Biology · 109 questions · Page 11 of 11 · Click an option or "Show Solution" to reveal answer

Q101

Chipko movement was launched for the protection of -

A Forests

B Livestock

C Wet lands

D Grasslands

Correct Answer

Option A

Solution

Chipko movement was launched for the protection of forests.

Q102

According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?

A 2.5 or less

B 1.5 or less

C 1.0 or less

D 5.2-2.5

Correct Answer

Option A

Solution

According to CPCB, 2.5 or less particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health.

Q103

Which one of the following is the correct percentage of the two (out of the total of 4) greenhouse gases that contribute to the total global warming ?

A CFCs 14%, Methane 20%

B CO2 40%, CFCs 30%

C N2O 6%, CO2 86%

D Methane 20%, N2O 18%

Correct Answer

Option A

Solution

CFC 14%, Methane 20% is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming.

Q104

Which one of the following is not a bioindicator of water pollution ?

A Blood-worms

B Stone flies

C Sewage fungus

D Sludge-worms

Correct Answer

Option B

Solution

Stone flies are not bioindicators.

Q105

Which one of the following statements is correct about chemical fertilizers and eutrophication?

A Cyanobacteria mobilize phosphates

B Both Azotobacter and Rhizobium fix nitrogen in root nodules

C Maize cannot grow without chemical fertilizers

D Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies

Correct Answer

Option D

Solution

Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies.

Q106

In which one of the following the BOD of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

A SE < PE < S < DE

B SE < S < PE < DE

C PE < S < SE < DE

D S < DE < PE < SE

Correct Answer

Option C

Solution

BOD of distillary effluent is 40000 mg/L and that of paper mill effluent and sewage is 190 mg/L and 30 mg/L respectively.

Q107

In a coal fired power plant electrostatic precipitators are installed to control emission of:-

A SPM

B SO2

C CO

D NOx

Correct Answer

Option A

Solution

SPM is suspended particulate matter which is less than 10 mm remaining in air for more than one day to several weeks.

Q108

Limit of BOD prescribed by Central Pollution Control Board for discharge of industrial and municipal waste waters into natural surface waters is -

A < 30 ppm

B < 3.0 ppm

C < 100 ppm

D < 10 ppm

Correct Answer

Option A

Solution

According to central pollution control board, limit of BOD prescribed is < 30 ppm for 3 days at 27 degrees C.

Q109

A lake near a village suffered heavy mortality of fishes. Which of the following were the main causes?

A (i) and (ii) - urea/phosphate fertilizer and DDT spraying

B (iii) and (iv) - green lake and declining phytoplankton

C (i) and (iii) - fertilizer use and green stinky water

D (ii) and (iii) - DDT and green water

Correct Answer

Option A

Solution

Lots of urea and phosphate fertilizer were used in the crops in the vicinity and the lake water turned green and stinky causing fish mortality.

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