IGCSE O Level Biology MCQs – Practice Test 18 (Chapter 7)

Effects of Human Activity on Ecosystem MCQ with Answers PDF Download – Test 18

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Effects of Human Activity on Ecosystem MCQ with Answers PDF Download: Quiz 18

MCQ 86: Dead algae and plants are decomposed by:

bacteria
fungi
virus
detritivores

MCQ 87: In ecosystem ,Silting means:

trees do not retain water
eroded soil gets deposited in rivers and streams
water levels rise rapidly in rivers
all of above

MCQ 88: Acidic waste products can be made less harmful if treated with:

water
alkalis
base
sulphuric acid

MCQ 89: The word BOD refers to the:

Bidding of Dermatology
Binding of Dirt
Biochemical occupied Date
Biochemical Oxygen demand

MCQ 90: Conserving metals may decrease:

environmental pollution only
waste disposal only
minerals in the crust
environmental pollution and waste disposal

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

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