Pollution of air and water Worksheet-8

Pollution of air and water Worksheet-8

Comprehension based Questions:

Chemical and pathogenic pollution pose grave risk to human health and all life forms. Waterborne diseases are quite common nowadays. Excessive nutrients from sewage and fertilizers, for example, cause excessive growth of weeds that harms population of aquatic life forms and navigation. This is called Eutrophication. Presence of certain chemicals and minerals like mercury and lead can cause serious disorders and deformities in human beings and animals. Radioactive pollution also does so. Such chemicals generally come through industrial wastes. Thermal pollution raises temperature of water. Some life forms are highly susceptible to even slight increase in temperature. So rise in temperature can even wipe out some species. Ships and oil tankers accidentally cause oil spills that pollute seas and affect all marine life. The Mediterranean Sea has been declared a dead sea since 1950 due to excessive pollution from nearby countries. It can support no aquatic life.

Pathogenic pollution is related with-

(A) Harmful chemicals (B) Radioactive elements

Which of these is water borne disease?

(A) Typhoid (B) TB (C) Malaria (D) Dysentery

(E) None

Excessive nutrient in field causes-

(A) Water pollution (B) Air pollution

(E) All

Maximum use of fertilizers in agricultural fields causes-

(A) Death of aquatic flora (B) Death of aquatic fauna

Excessive growth of algae in water body due to use of excessive fertilization is caused-

(A) Biological magnification (B) Eutrophication

(E) None f these

Thermal pollution is responsible for-

(A) High growth rate of aquatic plants

(B) Increase amount of oxygen

(D) Extinction of water species

Answer:

Harmful bacteria
Dysentery
Water pollution
Both
Eutrophication
Extinction of water species