Biogeochemical cycles: Identify why atmospheric N₂ remains approximately constant in the biosphere. Full question: N₂ content is kept nearly constant in the biosphere due to which natural process? Choose the correct option.

Difficulty: Easy

The nitrogen cycle (balance between nitrogen fixation and denitrification)
The carbon cycle
The oxygen cycle
The water cycle
Continuous volcanic emissions only

Correct Answer: The nitrogen cycle (balance between nitrogen fixation and denitrification)

Explanation:

Concept / Approach
Atmospheric N₂ is stabilized because nitrogen fixation (by diazotrophs/lightning) converts N₂ to bioavailable forms while denitrification (by anaerobic bacteria) returns nitrate/nitrite back to N₂. This dynamic nitrogen cycle keeps atmospheric N₂ levels relatively constant.

Final Answer
The nitrogen cycle (balance between nitrogen fixation and denitrification).

← Previous Question Next Question→

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion

Biogeochemical cycles: Identify why atmospheric N₂ remains approximately constant in the biosphere. Full question: N₂ content is kept nearly constant in the biosphere due to which natural process? Choose the correct option.

More Questions from Biology

Discussion & Comments