Which of the following causes biomagnification?
$\mathrm{SO}_2$
Mercury
DDT
Both (b) and (c)
The expanded form of DDT is
dichloro diphenyl trichloroethane
dichloro diethyl trichloroethane
dichloro dipyrydyl trichloroethane
dichloro diphenyl tetrachloroacetate
Which of the following material takes the longest time for biodegradation?
Cotton
Paper
Bone
Jute
Choose the incorrect statement.
The Montreal protocol is associated with the control of emission of ozone depleting substances
Methane and carbon dioxide are green house gases
Dobson units are used to measure oxygen content
Use of incinerators is crucial to disposal of hospital wastes
Among the following which one causes more indoor chemical pollution?
Burning coal
Burning cooking gas
Burning mosquito coil
Room spray