Question:
Soil air contains higher concentration of:
Soil air contains higher concentration of:
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Exam Tip: Soil air is a dynamic system. Remember the key gases: CO\(_2\) is higher, O\(_2\) is lower, and N\(_2\) is roughly the same as in the atmosphere. The biological activity in soil drives these differences.
Updated On: Aug 27, 2026
- Hydrogen
- Carbondioxide
- Nitrogen
- Helium
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
This question tests knowledge of soil composition, specifically the composition of soil air compared to the atmosphere. Soil air is the gaseous phase of the soil, occupying the pore spaces between soil particles.
Step 2: Analyzing Soil Air Composition:
Soil air differs significantly from atmospheric air in its composition due to biological activity in the soil.
The key differences are:
• Higher concentration of carbon dioxide (CO\(_2\)).
• Lower concentration of oxygen (O\(_2\)).
• High humidity (water vapor content). The higher CO\(_2\) concentration is due to the respiration of plant roots, soil microorganisms, and the decomposition of organic matter.
Step 3: Eliminating Incorrect Options:
• (A) Hydrogen: Hydrogen is present in trace amounts in both soil air and the atmosphere.
• (C) Nitrogen: Nitrogen is the most abundant gas in the atmosphere but its concentration in soil air is similar to or slightly less than the atmosphere.
• (D) Helium: Helium is a trace gas with low concentration.
Step 4: Final Answer:
Soil air contains a higher concentration of carbon dioxide compared to the atmosphere. Therefore, option (B) is correct.
This question tests knowledge of soil composition, specifically the composition of soil air compared to the atmosphere. Soil air is the gaseous phase of the soil, occupying the pore spaces between soil particles.
Step 2: Analyzing Soil Air Composition:
Soil air differs significantly from atmospheric air in its composition due to biological activity in the soil.
The key differences are:
• Higher concentration of carbon dioxide (CO\(_2\)).
• Lower concentration of oxygen (O\(_2\)).
• High humidity (water vapor content). The higher CO\(_2\) concentration is due to the respiration of plant roots, soil microorganisms, and the decomposition of organic matter.
Step 3: Eliminating Incorrect Options:
• (A) Hydrogen: Hydrogen is present in trace amounts in both soil air and the atmosphere.
• (C) Nitrogen: Nitrogen is the most abundant gas in the atmosphere but its concentration in soil air is similar to or slightly less than the atmosphere.
• (D) Helium: Helium is a trace gas with low concentration.
Step 4: Final Answer:
Soil air contains a higher concentration of carbon dioxide compared to the atmosphere. Therefore, option (B) is correct.
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