39.The word colonies(Line 2, Para. 4)refers to ________.
A) tiny globules
B) watery regions
C) bacteria communities
D) little compartments
40.Commercial application of the research finding will be possible if salad cream can be made resistant to bacterial attack ________.
A) by varying its chemical composition
B) by turning it into a solid lump
C) while keeping its structure unchanged
D) while retaining its liquid form
Unit 2
21.B 22.A 23.B 24.D 25.C 26.A 27.C 28.C 29.A 30.B
31.D 32.B 33.C 34.D 35.A 36.A 37.B 38.D 39.C 40.D
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