Level: JHS, Basic 8 | Subject: Integrated Science | Strand: Cycles | Topic: Earth Science: The Carbon Cycle
Read the summary notes first, then try these questions. Go back to the summary notes for this topic.
Part A has 20 tick-box questions. Part B has 5 essay questions with a marking guide at the bottom.
Test Yourself: 20 Objective Questions
Tick one answer for each question, then press Review answer. If your answer is wrong, it will be marked first, then the correct answer will show in green.
1. The carbon cycle describes how carbon
2. In the air, carbon is mainly found as
3. Plants take carbon from the air through
4. Animals get carbon by
5. Which process puts carbon dioxide back into the air?
6. Dead plants and animals release carbon dioxide when they are
7. Burning charcoal and firewood is called
8. Which of these is a carbon source?
9. Which of these is a carbon sink?
10. Fossil fuels such as coal and crude oil were formed from
11. Which of these is a fossil fuel?
12. Cutting down forests increases carbon dioxide in the air because
13. Too much carbon dioxide in the air causes
14. The oceans act as a carbon sink because they
15. Limestone and sea shells are made mostly of
16. A good way to reduce carbon dioxide in the air is to
17. In the carbon cycle, the arrow from the air to green plants stands for
18. Bush burning affects the carbon cycle by
19. Which statement is TRUE about the carbon cycle?
20. Which living things return carbon from dead matter to the soil and air?
Essay Questions
- (a) What is the carbon cycle? (b) Name three processes that add carbon dioxide to the air. (5 marks)
- Explain how carbon moves from the air into plants and then to animals. (4 marks)
- Draw and label a simple diagram of the carbon cycle showing photosynthesis, respiration, decomposition and combustion. (6 marks)
- State the difference between a carbon source and a carbon sink. Give two examples of each. (6 marks)
- Explain why cutting down forests and burning fuels can lead to global warming. (4 marks)
Essay Questions: Marking Guide for Teachers and Parents
- (a) The way carbon moves between the air, living things, soil, water and fuels (2). (b) Any three: respiration, decay or decomposition, burning of fuels, bush burning (1 mark each).
- Plants take in carbon dioxide from the air (1). They use sunlight to make food by photosynthesis (1). Animals eat the plants (1). The carbon in the food passes into the animals’ bodies (1).
- Carbon dioxide in the air, with an arrow down to plants labelled photosynthesis (1). Arrows from plants to animals labelled feeding (1). Arrows from plants and animals to the air labelled respiration (1). Arrows from dead plants and animals to decomposers and then to the air labelled decomposition (1). An arrow from fuels and fires to the air labelled combustion (1). A neat, clear and labelled diagram (1).
- A carbon source gives out carbon dioxide into the air (1). A carbon sink takes in and stores carbon (1). Sources, any two: vehicles, bush fires, factories, decaying matter (1 mark each). Sinks, any two: forests, oceans, fossil fuels, limestone (1 mark each).
- Burning fuels and cutting forests add carbon dioxide to the air (1). Fewer trees mean less carbon dioxide is taken out (1). Carbon dioxide traps heat from the Sun (1). The Earth becomes warmer, which is global warming (1).
Education Always (education.inspiringalways.com). Original practice questions, not official WAEC or BECE questions.