IGCSE O Level Biology MCQs - Chapter 7
Effects of Human Activity on Ecosystem Multiple Choice Questions (MCQs) PDF Download - 9
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Effects of Human Activity on Ecosystem Questions & Answers PDF Download: MCQ Quiz 9
MCQ 41: Miscarriages in women may be due to intake of
- carbon dioxide
- polluted water
- water containing dioxins
- DDT
MCQ 42: Nitrates (NO3-1) and phosphates (PO4-3) reach underground water with
- acid rains
- fertilizers washed away by rain water
- decomposition of organic compounds by anaerobic bacteria
- decomposition of organic compounds by aerobic bacteria
MCQ 43: Central heating systems can be run through
- more deforestation
- burning of garbage
- lesser incinerators
- cooling water pipelines
MCQ 44: Loss of control of hand and feet occurs due to
- lead poisoning (Pb)
- sulfur dioxide (SO2)
- nitrogen oxide (NO)
- carbon dioxide (CO2)
MCQ 45: Metals is produced as waste in industries like
- skiing
- mining
- electroplating
- digging
IGCSE O Level Biology Mock Tests
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