A factory drains its waste water into the nearby lake causing algal bloom.
(a) How was the algal bloom caused ?

(b) What would be the consequences ?

(c) Give the term for the cause of it.

(a) Algal bloom is caused due to enrichment of water with nutrients such as nitrogen and phosphorus. As the fertility increases plant life increases.

(b) Water becomes unfit for aquatic fauna because of less oxygen, scum and unpleasant odour.

(c) Eutrophication.

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Why is the use of unleaded petrol recommended for motor vehicles equipped with catalytic converters ?

Why is ozone layer in stratosphere called a protective layer ? Write a short note on the causes and effects of ozone depletion.

Write “True” or “False” :

A.

The CO₂ causes asphyxial death due to oxygen starvation.

B.

Acid rain caused due to oxides of nitrogen and sulphur.

C.

Ozone destroys the crops of potato, alfalfa and spinach.

D.

The UV rays and IR rays are ionising radiations.

E.

The photochemical smog contains PAN and Ozone.

Write about the contribution of Ahmed Khan to reduce the amount of plastic waste.

Environmental Issues