#1
1. Which element is a key component of proteins and often limits primary productivity in aquatic ecosystems?
#2
2. In which biogeochemical cycle do plants release water vapor through small openings in their leaves?
#3
3. What is the primary source of energy for the nitrogen cycle?
#4
4. Which biogeochemical cycle involves the transformation of atmospheric nitrogen into a form usable by plants?
#5
6. Which process returns nutrients from dead organisms and waste back to the soil, promoting the phosphorus cycle?
#6
7. What is the main reservoir of phosphorus in the phosphorus cycle?
#7
11. What is the main process responsible for the release of phosphorus from rocks into the soil in the phosphorus cycle?
#8
12. Which component of the nitrogen cycle involves the conversion of ammonium to nitrate by nitrifying bacteria?
#9
16. What is the primary source of sulfur in the sulfur cycle?
#10
5. In which part of the carbon cycle do plants take in carbon dioxide for photosynthesis?
#11
8. Which element is a crucial component of nucleic acids, such as DNA and RNA, and plays a key role in the nitrogen cycle?
#12
9. What is the primary role of denitrifying bacteria in the nitrogen cycle?
#13
10. Which human activity significantly impacts the carbon cycle by releasing large amounts of carbon dioxide into the atmosphere?
#14
13. What role do decomposers play in the carbon cycle?
#15
14. In the water cycle, what process involves the conversion of water vapor into liquid water droplets?
#16