IGCSE O Level Biology MCQs - Chapter 7

Effects of Human Activity on Ecosystem Multiple Choice Questions (MCQs) PDF Download - 5

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Effects of Human Activity on Ecosystem Questions & Answers PDF Download: MCQ Quiz 5

MCQ 21: Chronic bronchitis and emphysema are more vulnerable to

acid rains
water pollutants
smog
nitrogen oxides

MCQ 22: Carboxyhemoglobin is formed if

CO₂ is allowed to mix with hemoglobin
if CO is allowed to react with hemoglobin
if long term exposure to lead and lead poisoning occurs
if carbon is allowed to react with hemoglobin

MCQ 23: Large gene pool enables

conservation of natural resources
depletion of natural resources
conservation of artificial resources
depletion of artificial resources

MCQ 24: Use of non-fossil fuel in factory may

help in lesser air pollution
increase pollution due to chimney fumes when fossil fuel is burnt
lower the air quality in densely populated areas
increase land pollution

MCQ 25: If water containing DDT (dichloro-diphenyl-trichloroethane: C₁₄H₉O₅) is fed upon by cattle, it will

get stored in the liver
get stored in the fatty tissues of animals
be excreted out with urine
get stored in the muscle fibers

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