Soil air composition includes__________________?
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Answer: C. Both a & b
Explanation
Soil air composition includes less oxygen and considerably more carbon dioxide compared to the above-ground atmosphere due to respiration. Plant roots, soil bacteria, and fungi continuously consume oxygen and respire carbon dioxide. This respiratory activity alters the gas balance within pore spaces. Atmospheric air contains roughly 21 percent oxygen and 0.04 percent carbon dioxide. In contrast, poorly ventilated soil air can feature significantly higher carbon dioxide levels. Gas diffusion between soil pores and the atmosphere helps maintain equilibrium.
Maintaining adequate soil aeration is crucial for preventing root suffocation and plant disease. Compacted or waterlogged soils restrict gas exchange, leading to toxic carbon dioxide buildups. Tillage practices help restore proper soil aeration for crop roots. Option a and option b are both correct individually, making the single choices incomplete. The none of the above option is incorrect because both gas changes are scientifically accurate.
- Subject
- Agriculture
- Category
- Agriculture
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- —
- Difficulty
- medium
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