The Montreal Protocol refers to

• Persistent organic pollutants

• Global warming and climate change

• Substances that deplete the ozone layer

• Biosafety of genetically modified organisms

Which is always present in photochemical smog?

• O₃

• CO₂

• SO₂

• CH₄

Which insecticide is more hazardous to human health?

• Rotenone

• Pyrethrum

• DDT

• Humulin

Minamata disease is caused due to the presence of in water.

• Cadmium

• Lead

• Arsenic

• Mercury

A lake with an inflow of domestic sewage rich in organic waste may result in

• Drying of the lake very soon due to algal bloom

• An increased production of fish due to lot of nutrients

• Death of fish due to lack of oxygen

• Increased population of the aquatic food web organisms

Ozone depletion in staratosphere would result in 

• forest fires

• global warming

• skin cancer incidence

• None of the above

Besides dung, the weed that can be used in biogas production is

• Hydrilla

• Solanum- nigrum

• Eichhornia Crassipes

• Parthenium hysterophorus

Which of the following bio-engineered bacteria is utilized for cleaning of marine oil slicks?

• Escherichia coli

• Pseudomonas syringae

• Pseudomonas putida

• Rhizoctonia solani

In a cola fired power plant, electrostatic precipitators are installed to control emission of

• SO₂

• NO_x

• SPM

• CO

Amount of Co, in expired air is about

• 0.04%

• 0.03%

• 4.5%

• 21%