IGCSE O Level Biology MCQs - Chapter 7

Effects of Human Activity on Ecosystem Quiz Questions and Answers PDF - 19

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Effects of Human Activity on Ecosystem Questions & Answers PDF Download: MCQ Quiz 19

MCQ 91: DDT (dichloro-diphenyl-trichloroethane: C₁₄H₉Cl₅) is a form of

insecticide
herbicide
pesticides
parasiticides

MCQ 92: In tubifax worms, the tolerance range for oxygen

is very low
is very high
is zero
is 100%

MCQ 93: All are wrong about Bacteria, but

cannot grow in fertilized soil
cannot degrade DDT
degrade DDT into simpler substances
digest white blood cells

MCQ 94: Pollutants from natural cause can

avoided if proper precautions are taken
not avoided no matter what precautions are taken
recycled
stored

MCQ 95: Inorganic wastes may include

mercury
arsenic
cadmium
all of above

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