IGCSE O Level Biology MCQs – Practice Test 14 (Chapter 7)

Effects of Human Activity on Ecosystem MCQ with Answers PDF Download – Test 14

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Effects of Human Activity on Ecosystem MCQ with Answers PDF Download: Quiz 14

MCQ 66: Eutrophication in an ecosystem is a:

good sign for ecosystem
bad sign for ecosystem
neutral sign for ecosystem
dual-sided sign for ecosystem

MCQ 67: An excellent habitat for bacterial growth is:

chlorofluorocarbons based products
burning of garbage
untreated sewage
all of above

MCQ 68: If heat radiated from the Earths surface is retained, the outcome will be:

formation of smog
green house effect
van der Walls forces of attraction among smoke particles
all of above

MCQ 69: Drift nets capture fish:

discriminately
indiscriminately
in both ways
drift nets don't capture fish

MCQ 70: Physical, mental abnormalities and risks of cancer are increased due to:

dichlorophenyl trichloroethane (DDT)
biochemical oxygen demand (BOD)
dioxins
greenhouse effect

Effects of Human Activity on Ecosystem MCQ App & e-Book – IGCSE O Level Biology Entrance Exam

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