Human Influences on the Environment

Human Influences on the Environment Quiz

Spec 4.12–18B · Edexcel IGCSE Biology: Quiz

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5 questions, one answer each

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  1. 1. What does sulfur dioxide pollution mainly cause?

    • A. Global warming
    • B. Acid rain
    • C. Eutrophication
    • D. Ozone depletion

  2. 2. Why is carbon monoxide dangerous to humans?

    • A. It causes acid rain
    • B. It binds to haemoglobin, reducing oxygen transport in the blood
    • C. It destroys lung tissue directly
    • D. It increases greenhouse warming

  3. 3. A lake receives runoff rich in nitrate fertiliser. Algae grow rapidly and cover the surface. What happens next?

    • A. Fish populations increase due to more food
    • B. Submerged plants die from lack of light, then decomposers deplete oxygen, killing aquatic animals
    • C. Oxygen levels rise due to more photosynthesis
    • D. Nothing changes, algae have no effect on other organisms

  4. 4. Which of these is NOT a consequence of deforestation?

    • A. Increased soil erosion
    • B. Increased leaching of minerals
    • C. Increased carbon dioxide removal from the atmosphere
    • D. Disturbed evapotranspiration

  5. 5. Why does the enhanced greenhouse effect lead to global warming?

    • A. Increased greenhouse gases reflect more sunlight away from Earth
    • B. Increased greenhouse gases trap more heat energy in the atmosphere
    • C. Greenhouse gases destroy the ozone layer directly
    • D. Greenhouse gases increase oxygen levels, raising temperature

Quiz