NEET UG - Biogeochemical cycles - carbon nitrogen water phosphorus One Line Questions & Answers

1. The excessive addition of phosphorus to aquatic ecosystems, leading to algal blooms and eutrophication, is known as: — Eutrophication

2. Which of the following human activities significantly contributes to the release of CO2 into the atmosphere? — Combustion of fossil fuels

3. The carbon stored in forests is primarily in the form of: — Organic compounds in biomass (wood, leaves, roots)

4. In the phosphorus cycle, the eventual return of phosphorus to rocks occurs through: — Sedimentation and geological uplift

5. Which of the following is NOT a direct human impact on the carbon cycle? — Use of nitrogen fertilizers

6. Deforestation can lead to increased soil erosion, which in turn can affect the availability of which nutrient in aquatic systems? — Phosphorus

7. Sedimentary rocks are the primary reservoir for which element's cycle? — Phosphorus

8. Acid rain, primarily caused by the release of sulfur dioxide and nitrogen oxides, impacts which biogeochemical cycles? — Nitrogen and phosphorus cycles

9. The Haber-Bosch process, used for industrial production of ammonia, has significantly altered which biogeochemical cycle? — Nitrogen cycle

10. Which of the following is the most abundant form of carbon in the Earth's atmosphere? — Carbon dioxide (CO2)

11. Human activities like deforestation and burning of fossil fuels primarily affect which part of the carbon cycle? — Carbon exchange between atmosphere and biosphere/lithosphere

12. The process of water moving from the Earth's surface into the atmosphere as vapor is called: — Evaporation

13. The transformation of water from a liquid to a gas state due to increased kinetic energy from solar radiation is known as: — Evaporation

14. Which process converts atmospheric nitrogen (N2) into ammonia (NH3), making it available for plants? — Nitrogen fixation

15. What is the main role of nitrogen in living organisms? — Structural component of nucleic acids and proteins

16. What is the process by which water vapor in the atmosphere cools and changes into liquid water, forming clouds? — Condensation

17. Water falling back to Earth in the form of rain, snow, sleet, or hail is called: — Precipitation

18. The release of water vapor from plants into the atmosphere is known as: — Transpiration

19. What is the primary role of decomposers (like bacteria and fungi) in the nitrogen cycle? — Converting organic nitrogen to ammonia (ammonification)

20. Which microorganisms are primarily responsible for biological nitrogen fixation? — Bacteria and Archaea

21. What is the primary source of energy driving the water cycle? — Solar energy

22. The water cycle is also known as the: — Hydrologic cycle

23. What is the main impact of eutrophication on aquatic ecosystems? — Decreased oxygen levels and fish kills

24. Which of the following is a major source of human-induced phosphorus pollution? — Sewage and agricultural runoff

25. What is the term for the movement of water from land surfaces into rivers, lakes, and oceans? — Runoff

26. The process of converting dissolved organic matter back into inorganic nutrients is called: — Mineralization

27. The symbiotic relationship between Rhizobium bacteria and leguminous plants is crucial for: — Nitrogen fixation

28. The process of ammonification involves the conversion of organic nitrogen into: — Ammonia

29. The process by which decomposers break down dead organic matter, releasing carbon back into the environment, is called: — Decomposition

30. Which process returns nitrogen from nitrates back to the atmosphere as nitrogen gas (N2)? — Denitrification

31. Which process in the nitrogen cycle converts organic nitrogen in dead organisms and waste products into ammonia? — Ammonification

32. Which process is responsible for converting nitrates back into nitrogen gas in anaerobic conditions? — Denitrification

33. The conversion of ammonia (NH3) to nitrites (NO2-) and then to nitrates (NO3-) is known as: — Nitrification

34. Excessive use of nitrogen fertilizers in agriculture can lead to: — Eutrophication of water bodies

35. Plants primarily absorb nitrogen in which form? — Nitrates (NO3-)

36. Which type of bacteria performs denitrification? — Pseudomonas

37. Which of the following is a consequence of the human impact on the carbon cycle? — All of the above

38. Which of the following is a major reservoir for water on Earth? — All of the above

39. What is the main form of phosphorus found in oceanic waters, which is then utilized by phytoplankton? — Phosphate ions (PO43-)

40. Phosphorus is primarily found in rocks and soil in the form of: — Phosphate ions (PO43-)

41. Plants absorb phosphorus mainly in the form of: — Phosphate ions (PO43-)

42. Which of the following is a key function of the carbon cycle in Earth's climate system? — Regulation of Earth's temperature through the greenhouse effect

43. In the carbon cycle, what is the role of chemosynthesis? — Conversion of CO2 into organic compounds by some bacteria in the absence of sunlight

44. What is the primary process by which carbon is removed from the atmosphere and converted into organic matter? — Photosynthesis

45. Which component of the water cycle involves the movement of water through the soil and rock layers underground? — Percolation

46. Which of the following is a major reservoir of carbon on Earth? — All of the above

47. Unlike carbon, nitrogen, and water, the phosphorus cycle has a significant reservoir in: — Rocks and soil

48. The slow geological process of phosphorus moving from land to oceans and back via rock formation is characteristic of: — The phosphorus cycle

49. The process of assimilation in the nitrogen cycle refers to: — The uptake of inorganic nitrogen compounds by plants and their conversion into organic compounds

50. What is the main process by which phosphorus is released from rocks into the environment? — Weathering and erosion

Biogeochemical cycles - carbon nitrogen water phosphorus - One Line Questions