31.The component of “ecosystem” are?
(a) Biotic component,
(b) A biotic,
(c) Both A&B,
(d) None of these,
answer
(c) Both A&B,
32.The study, of “relationship of living, organisms with, their system” is ,called?
(a) Environment,
(b) Ecosystem,
(c) Ecology,
(d) all,
answer
(c) Ecology,
33.The component, which includes, all living, organism are called?
(a) Biotic,
(b) A biotic,
(c) none of these,
(d) both A & B,
answer
(a) Biotic,
34.The component, which includes, all non-living, organisms?
(a) Biotic,
(b) Abiotic,
(c) Both A &B,
(d) none,
answer
(b) Abiotic,
35.Percentage of ,water on earth ,surface is about: ?
(a) 50%,
(b) 60 %,
(c) 70 %,
(d) 80%,
answer
(c) 70 %,
36. “Pesticide and fertilizers” are the, source of?
(a) Domestic waste,
(b) Industrial waste,
(c) Agriculture waste,
(d) Acid rain,
answer
(c) Agriculture waste,
37. “Harmful bacteria” are removed ,from water by ,passing?
(a) Oxygen gas,
(b) Chlorine gas,
(c) Nitrogen gas,
(d) Carbon dioxide gas,
answer
(b) Chlorine gas,
38. “Distillation” is a, technique, of?
(a) Separation,
(b) Filtration,
(c) preparation,
(d) disinfection,
answer
(a) Separation,
39. These have ,the same number ,of protons in ,each atom but ,the neutron ,numbers ,can very’?
(a) Isotopes,
(b) Isobars,
(c) Molecules,
(d) None,
answer
(a) Isotopes,
40. The particle, that carries is, negative electrical, charge?
(a) Neutron,
(b) Proton,
(c) Nucleus,
(d) Electron,
answer
(d) Electron,
