IGCSE O Level Biology Cerification Guide: Practice Test 19 (Chapter 7)

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

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Effects of Human Activity on Ecosystem Exam Questions and Answers PDF Download: Test 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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