31- Which of the following is a deadly poison?
(A) Molecule
(B) Hydrogen
(C) Oxygen
(D) Ozone
32- The UV radiations of the ………………….cause skin cancer in human beings.
(A) Molecule
(B) Oxygen
(C) Ozone
(D) None of the above
33- The higher energy UV radiations split apart some molecular oxygen into free ……………..atoms.
(A) Nitrogen
(B) Oxygen
(C) Hydrogen
(D) All of the above
34- The amount of ozone in the atmosphere began to drop sharply in……………..
(A) 1980
(B) 1981
(C) 1982
(D) 1983
35- ……….is used as refrigerants and in fire extinguishers.
(A) Hydrogen
(B) Molecule
(C) Chlorofluorocarbons
(D) Hydro fluorocarbon
36- In which year UNEP succeeded in forging an agreement to freeze CFC production at 1986 levels?
(A) 1987
(B) 1984
(C) 1985
(D) 1983
37- There is a need to reduce the use of the plastic bags, bottles etc because…………………
(A) They are non Bio-degradable
(B) They are Bio-degradable
(C) They are made up of toxic material
(D) They are not environment friendly
38- In food chain second level trophic level is occupied by ………………..
(A) Carnivores
(B) Herbivores
(C) Producer
(D) Consumer
39- How much percentage of sun’s energy is used by green plants to prepare food by process of Photosynthesis?
(A) 10%
(B) 5%
(C) 1%
(D) 0%
40- The process by which accumulation of chemical substances like pesticides, in the body of living organisms at each trophic level of food chain?
(A) Herbicides magnification
(B) Biological accumulation
(C) Accumulation magnification
(D) Biological magnification
ANSWERS:
31-(D), 32-(C), 33-(B), 34-(A), 35-(C), 36-(A), 37-(A), 38-(B), 39-(C), 40-(D)