7000+ Biosphere MCQ Questions and Answers Pdf - 2

Question: 6

The maximum biological magnification of DDT through food web is seen in

(A) Man

(B) Higher plants

(C) Algae

(D) Bacteria

Question: 7

A microscopic organism playing a vital role in nitrogen cycle is

(A) Bacteria

(B) Red algae

(C) Virus

(D) Protozoa

Question: 8

The largest source of pollution in the world is

(A) Sewage and garbage

(B) Automobile exhausts

(C) Herbicides and insecticides

(D) Industrial effluents

Question: 9

Which of the following is biodegradable?

(A) Aluminium

(B) D.D.T

(C) Plastic

(D) Paper

Question: 10

Which of the following is usually not an air pollutant?

(A) Nitrous oxide

(B) Carbon dioxide

(C) Sulphur dioxide

(D) Hydrocarbon