IGCSE O Level Biology MCQs – Practice Test 10 (Chapter 7)

Effects of Human Activity on Ecosystem MCQ with Answers PDF Download – Test 10

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Effects of Human Activity on Ecosystem MCQ with Answers PDF Download: Quiz 10

MCQ 46: Along the trophic level, in a food chain, the insecticide amount:

decreases at each trophic level
increases at each trophic level
remains unchanged
may increase or decrease depending on consumption

MCQ 47: Gaseous pollutants include:

biological decay
forest fires
volcanic eruptions
all of above

MCQ 48: No smog occurs if:

cool air is allowed to escape
if pollutants like smoke and sulphur dioxide are prevented from escape
if cool air and pollutants are prevented from escape
if pollutants like smoke and sulphur dioxide are escape

MCQ 49: Ozone depletion can be prevented with:

use of scrubbers in factory chimneys
acidic waste is treated with alkalis
fossil fuels are used in factories
lower consumption of chlorofluorocarbons-based products

MCQ 50: Reaction between oxides of nitrogen (N₂) and oxygen (O₂) results in:

formation of nitric acid only
acid rains only
alkali rain
formation of nitric acid and acid rains

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

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