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SingaporeBiologyQuick questions
Organisms and Their Environment
Quick questions on Human impact on the environment explained: O-Level Biology
5short 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 the enhanced greenhouse effect?Show answer
Greenhouse gases such as carbon dioxide and methane trap heat in the atmosphere. This keeps the Earth warm enough for life. But burning fossil fuels and deforestation add extra carbon dioxide, trapping more heat and causing global warming (a rise in average temperatures), which can lead to melting ice, rising sea levels and changing climates.
What is conserving the environment?Show answer
Ways to reduce human impact and conserve the environment include:
What is q1?Show answer
Name the process by which fertiliser run-off leads to fish deaths. [1 mark]
What is q2?Show answer
State two harmful effects of deforestation. [2 marks]
What is q3?Show answer
Explain how extra carbon dioxide contributes to global warming. [2 marks]
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