Oxidation and reduction happen when soils are alternately wet and dry. Why don\'
ID: 802118 • Letter: O
Question
Oxidation and reduction happen when soils are alternately wet and dry. Why don't we see oxidation and reduction in soils after every rain storm?
Question 4 options:
Rain typically drains through the soil profile too quickly for oxidation or reduction to occur.
Plants quickly uptake any free iron and manganese, leaving the soil devoid of elements to oxidize or reduce.
Carbon dioxide in the atmosphere reacts with rain water to form carbonic acid, and this reaction prevents oxidation or reduction from happening.
Neither oxidation nor reduction can happen anaerobically (without oxygen), so saturated soil pores do not exhibit redoximorphic features.
A)Rain typically drains through the soil profile too quickly for oxidation or reduction to occur.
B)Plants quickly uptake any free iron and manganese, leaving the soil devoid of elements to oxidize or reduce.
C)Carbon dioxide in the atmosphere reacts with rain water to form carbonic acid, and this reaction prevents oxidation or reduction from happening.
D)Neither oxidation nor reduction can happen anaerobically (without oxygen), so saturated soil pores do not exhibit redoximorphic features.
Explanation / Answer
B.Immediately after the flooding of soil, the oxygen which is limited in pore spaces of soil gets depleted rapidly by the action of plants roots and microorganisms. This process leads to reduction is soil Redox or reduction oxidation potential. After that a series a processes takes place which includes denitrification,reduction of iron, sulphate and manganese and thus change in soil Eh and Ph. So the quick uptake of any free iron and manganese by the plants makes the soil devoid of elements to oxidise or reduce and therefore we dont see oxidation or reduction after every storms.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.