A farmer finds soil pH to be 9. Why may adding organic manure be advised?
Answer and explanation
Correct answer: Mild acidic substances formed on decomposition can reduce basicity
A pH of 9 indicates that the soil is alkaline. During decomposition, organic manure can produce humus and various weakly acidic substances. These may react with or buffer some alkaline components, helping to reduce excessive basicity and improve soil conditions. The change is gradual and does not make the pH zero. Organic manure does not turn soil into metal and does not only increase alkalinity. Therefore A is correct.
Frequently asked questions
What is the correct answer to this question?
Mild acidic substances formed on decomposition can reduce basicity
Why is this the correct answer?
A pH of 9 indicates that the soil is alkaline. During decomposition, organic manure can produce humus and various weakly acidic substances. These may react with or buffer some alkaline components, helping to reduce excessive basicity and improve soil conditions. The change is gradual and does not make the pH zero. Organic manure does not turn soil into metal and does not only increase alkalinity. Therefore A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
