MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For releasing CO2 in the atmosphere, how are fossil fuels exploited? |
| A. | Mined and burned |
| B. | Fragmented and leached |
| C. | Leached and burned |
| D. | Mined and fragmented |
| Answer» B. Fragmented and leached | |
| 2. |
Which one of the following plants use as a source for carbon dioxide? |
| A. | Carbonate rocks |
| B. | Calcium rocks |
| C. | Fossils |
| D. | Atmospheric CO<sub>2</sub> |
| Answer» E. | |
| 3. |
What product does the plants from by photosynthesis using carbon dioxide? |
| A. | Lipids |
| B. | Carbohydrates |
| C. | Proteins |
| D. | Salts |
| Answer» C. Proteins | |
| 4. |
In which form does the carbon dioxide precipitate after dissolving in water? |
| A. | Calcium oxide |
| B. | Carbon mono-oxide |
| C. | Calcium carbonate |
| D. | Calcium phosphate |
| Answer» D. Calcium phosphate | |
| 5. |
Which human activities have significantly influenced the carbon cycle? |
| A. | Afforestation |
| B. | Deforestation only |
| C. | Burning of fossil fuel only |
| D. | Both deforestation and burning of fossil fuel |
| Answer» E. | |
| 6. |
Which of the following organism contributes to the CO2 pool by the processing of waste materials and dead organic matter? |
| A. | Carnivores |
| B. | Herbivores |
| C. | Decomposers |
| D. | Producers |
| Answer» D. Producers | |
| 7. |
By which process does the carbon return to the atmosphere as CO2? |
| A. | Decayed organisms |
| B. | Calcareous sediments |
| C. | Photosynthesis |
| D. | Respiration |
| Answer» E. | |
| 8. |
What amount of carbon is fixed in the biosphere through photosynthesis annually? |
| A. | 10<sup>13</sup> kg |
| B. | 20 10<sup>20</sup> kg |
| C. | 4 10<sup>13</sup> kg |
| D. | 80 10<sup>35</sup> kg |
| Answer» D. 80 10<sup>35</sup> kg | |
| 9. |
From which stages does the carbon cycling occur? |
| A. | Dead organisms Living organisms Oceans |
| B. | Atmosphere Living organisms Dead organisms |
| C. | Oceans Atmosphere Dead organisms |
| D. | Atmosphere Oceans Living organisms Dead organisms |
| Answer» E. | |
| 10. |
Whose reservoir does fossil fuel represent? |
| A. | Oxygen |
| B. | Carbon |
| C. | Helium |
| D. | Argon |
| Answer» C. Helium | |
| 11. |
What percent of total global carbon does the atmosphere contain? |
| A. | 5 % |
| B. | 50 % |
| C. | 1% |
| D. | 20 % |
| Answer» D. 20 % | |
| 12. |
Which reservoir regulates the amount of carbon dioxide in the atmosphere? |
| A. | Gaseous reservoir |
| B. | Sedimentary reservoir |
| C. | Atmospheric reservoir |
| D. | Oceanic reservoir |
| Answer» E. | |
| 13. |
Out of the total quantity of global carbon, what percent of carbon is found dissolved in oceans? |
| A. | 50 % |
| B. | 71 % |
| C. | 90 % |
| D. | 25 % |
| Answer» C. 90 % | |
| 14. |
Which is the most abundant constituent found in living organisms? |
| A. | Water |
| B. | Oxygen |
| C. | Ammonia |
| D. | Hydrogen bicarbonate |
| Answer» B. Oxygen | |
| 15. |
What percent of dry weight does carbon constitute in the living organisms? |
| A. | 55 percent |
| B. | 49 percent |
| C. | 20 percent |
| D. | 90 percent |
| Answer» C. 20 percent | |