Haemoglobin of the blood forms carboxy haemoglobin with __________.

(a)

Carbon dioxide

(b)

Carbon tetra chloride

(c)

Carbon monoxide

(d)

Carbonic acid

Photo chemical smog formed in congested metropolitan cities mainly consists of ___________

(a)

Ozone, SO₂ and hydrocarbons

(b)

Ozone, PAN and NO₂

(c)

PAN, smoke and SO₂

(d)

Hydrocarbons, SO₂ and CO₂

Ozone depletion will cause ___________.

(a)

forest fires

(b)

eutrophication

(c)

bio magnification

(d)

global warming

Living in the atmosphere of CO is dangerous because it __________.

(a)

Combines with O₂ present inside to form CO₂

(b)

Reduces organic matter of tissues

(c)

Combines with haemoglobin and makes it incapable to absorb oxygen

(d)

Dries up the blood

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ___________.

(a)

highly polluted

(b)

poor in dissolved oxygen

(c)

rich in dissolved oxygen

(d)

low COD