Home > Class 12 Biology > Quizzes > Class 12 Biology Practice Test: Ecosystem - Carbon Cycle
Class 12 Biology Practice Test: Ecosystem - Carbon Cycle
Fast practice, instant feedback. Timer auto-submits when time’s up.
Avg score: 87% • Most missed: “From which stages does the carbon cycling occur?”
Class 12 Biology Practice Test: Ecosystem - Carbon Cycle
Time left 00:00
15 Questions

1. Which of the following organism contributes to the CO2 pool by the processing of waste materials and dead organic matter?
2. By which process does the carbon return to the atmosphere as CO2?
3. What percent of total global carbon does the atmosphere contain?
4. Which is the most abundant constituent found in living organisms?
5. Which one of the following plants use as a source for carbon dioxide?
6. What percent of dry weight does carbon constitute in the living organisms?
7. What amount of carbon is fixed in the biosphere through photosynthesis annually?
8. In which form does the carbon dioxide precipitate after dissolving in water?
9. From which stages does the carbon cycling occur?
10. What product does the plants from by photosynthesis using carbon dioxide?
11. In which form does the carbon dioxide precipitate after dissolving in water?
12. What percent of dry weight does carbon constitute in the living organisms?
13. Whose reservoir does fossil fuel represent?
14. Which human activities have significantly influenced the carbon cycle?
15. By which process does the carbon return to the atmosphere as CO2?

⚡ Recently practiced quizzes in this topic
Live quiz activity
Class 12 Biology Practice Test: Evolution - Evidences for Evolution Class 12 Biology Practice Test: Molecular Basis of Inheritance - DNA Fingerprinting Class 12 Biology Practice Test: Molecular Basis of Inheritance - Methodologies of HGP Class 12 Biology Practice Test: Principles of Inheritance and Variation - Mendel's Laws of Inheritance MCQs for Human Reproduction Class 12 Biology Practice Test: Environmental Issues - Radioactive Wastes Class 12 Biology Practice Test: Molecular Basis of Inheritance - The Machinery and the Enzymes for Replication of DNA Class 12 Biology Practice Test: Organisms and Populations - Population Growth Class 12 Biology Practice Test: Biodiversity and Conservation - Importance of Species Diversity to the Ecosystem Class 12 Biology Practice Test: Molecular Basis of Inheritance - Lac Operon
 
❤ If you liked Fatskills, consider supporting us by checking out The Life Manuals You Never Got.

🌈  Our mission is to help improve your scores in any subject and exam withonline quizzes, practice tests, study guides, & advice for students. Since 2018.
About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | OSHA Basics Quiz | What Should We Know?
Privacy | Terms |
Without work one finishes nothing. - Ralph Waldo Emerson
© 2026 Fatskills.com

All trademarks, logos and brand names are the property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement.