Cycles Within Ecosystems
Overview
Carbon is the backbone of every organic molecule, yet there is only a fixed amount of it on Earth. The same carbon atoms that once formed the body of a dinosaur may now be part of a leaf, a lump of coal, or the air you are breathing out right now.
In this lesson you will trace the carbon cycle through its four main stages: photosynthesis, respiration, decomposition and combustion. You will see how carbon moves between the atmosphere, living organisms and fossil fuels, and why human activity is disrupting the balance.
Objectives
- Describe the stages in the carbon cycle, including respiration, photosynthesis, decomposition and combustion
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Cycles Within Ecosystems. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which process removes carbon dioxide from the atmosphere? A) Respiration B) Combustion C) Photosynthesis D) Decomposition Answer: C
- Fossil fuels are formed from: A) Volcanic rock compressed over time B) The remains of ancient organisms buried under heat and pressure C) Carbon dioxide dissolved in rainwater D) Sand and clay minerals compressed together Answer: B
- Decomposers return carbon to the atmosphere by: A) Photosynthesis B) Combustion C) Respiration D) Evaporation Answer: C
- Which of the following is NOT a stage in the carbon cycle? A) Photosynthesis B) Transpiration C) Respiration D) Combustion Answer: B
- Deforestation increases atmospheric CO2 because: A) Trees release CO2 when alive B) Fewer trees means less photosynthesis to absorb CO2 C) Decomposers stop working without trees D) Soil absorbs more CO2 without tree roots Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
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