5
MCQ (Single Correct Answer)
World's most problematic aquatic weed is
A
Azolla
B
Wolffia
C
Eichhornia
D
Trapa
6
MCQ (Single Correct Answer)
Which of the following causes biomagnification?
A
$\mathrm{SO}_2$
B
Mercury
C
DDT
D
Both (b) and (c)
7
MCQ (Single Correct Answer)
The expanded form of DDT is
A
dichloro diphenyl trichloroethane
B
dichloro diethyl trichloroethane
C
dichloro dipyrydyl trichloroethane
D
dichloro diphenyl tetrachloroacetate
8
MCQ (Single Correct Answer)
Which of the following material takes the longest time for biodegradation?
A
Cotton
B
Paper
C
Bone
D
Jute
9
MCQ (Single Correct Answer)
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