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NCERT Solutions for Class 12 Biology Chapter 16
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NCERT Solutions for Class 12 Biology Chapter 16
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ENVIRONMENTAL ISSUES 113CHAPTER 16
ENVIRONMENTAL ISSUES
MULTIPLE-CHOICE QUESTIONS
1. Non-biodegradable pollutants are created by:
a. nature
b. excessive use of resources
c. humans
d. natural disasters
2. According to the Central Pollution Control Board, particles that are
responsible for causing great harm to human health are of diameter:
a. 2.50 micrometers
b. 5.00 micrometers
c. 10.00 micrometers
d. 7.5 micrometers
3. The material generally used for sound proofing of rooms like a recording
studio and auditorium, etc. is:
a. cotton
b. coir
c. wood
d. styro foam
4. Compressed Natural Gas (CNG) is:
a. propane
b. methane
c. ethane
d. butane
5. World’s most problematic aquatic weed is:
a. Azolla
b. Wolffia
c. Eichornia
d. Trapa
, 114 BIOLOGY, EXEMPLAR PROBLEMS
6. Which of the following causes biomagnification?
a. SO2
b. Mercury
c. DDT
d. Both b & c
7. The expanded form of DDT is:
a. dichloro diphenyl trichloroethane
b. dichloro diethyl trichloroethane
c. dichloro dipyrydyl trichloroethane
d. dichloro diphenyl tetrachloroacetate
8. Which of the following material takes the longest time for biodegradation?
a. Cotton
b. Paper
c. Bone
d. Jute
9. Choose the incorrect statement.
a. The Montreal protocol is associated with the control of emission of
ozone depleting substances
b. Methane and carbon dioxide are green house gases
c. Dobson units are used to measure oxygen content
d. Use of incinerators is crucial to disposal of hospital wastes
10. Among the following which one causes more indoor chemical pollution?
a. burning coal
b. burning cooking gas
c. burning mosquito coil
d. room spray
11. The green scum seen in the fresh water bodies is:
a. blue green algae
b. red algae
c. green algae
d. both (a) and (c)
12. The loudness of a sound that a person can withstand without discomfort
is about
a. 150 dB.
b. 215 dB.
c. 30 dB.
d. 80 dB.
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