A. Tansley
B. Odum
C. Clements
D. Des Voeux
Pollution
Pollution
A. Paris
B. London
C. Tokyo
D. New York
A. Minamata disease
B. Osteosclerosis
C. Bright’s disease
D. Hashimoto disease
A. same as present
B. Less than the present
C. Higher than the present
D. Dependent on the amount of O2 in the atmosphere
A. Burning of fossil fuel
B. Thermal power plants
C. Sewage
D. Suspended particles
A. High
B. Low
C. Same
D. None of these
A. Its cost of production is high
B. It is not rapidly degraded in nature
C. Organisms at once developed resistance to it
D. It is significantly less effective than other pesticides
A. The development of resistant pest varieties
B. Simplification of food web
C. Reduction in population of useful birds
D. Increase in weed population
A. By changing O2 into CO
B. By destroying the haemoglobin
C. By forming a stable compound with haemoglobin
D. By obstructing the reaction of O2 with haemoglobin
A. It gives off a bad small
B. It removes the food eaten by fishes
C. It increases the competition with fishes for dissolved oxygen
D. Excessive CO2 is added to water