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SingaporeCombined ScienceQuick questions
Biology: Genetics and Ecology
Quick questions on Humans and the environment explained: O-Level Combined Science
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is acid rain?Show answer
Sulfur dioxide and nitrogen oxides dissolve in rainwater to form acids. Acid rain damages trees, makes lakes too acidic for fish, and erodes limestone buildings and statues. Using cleaner fuels and removing sulfur from fuels reduces it.
What is reducing the impact?Show answer
Measures to reduce environmental damage include:
What are vague solutions?Show answer
Say specifically how a measure helps (e.g. catalytic converters reduce nitrogen oxides), not just "stop pollution".
What is q1?Show answer
Name two gases released by burning fossil fuels and state the environmental problem each causes. [2 marks]
What is q2?Show answer
Explain how deforestation increases the amount of carbon dioxide in the atmosphere. [2 marks]
What is q3?Show answer
Suggest two ways of reducing the impact of human activity on the environment. [2 marks]
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