The correct answer is: b) Neutral to slightly alkaline.
The pH of a substance is a measure of its acidity or alkalinity. A pH of 7 is considered neutral, while a pH below 7 is acidic and a pH above 7 is alkaline. The pH of Tamil Nadu’s soils generally ranges from 7.5 to 8.5, which is slightly alkaline. This is due to the presence of limestone in the soil, which is a basic mineral.
Acid soils can cause problems for plants, as they can make it difficult for them to absorb nutrients. Alkaline soils can also cause problems, as they can make it difficult for plants to absorb certain nutrients and can also make the soil more susceptible to erosion.
The pH of soil can be affected by a number of factors, including the type of rock that the soil is derived from, the amount of rainfall, and the type of vegetation that grows in the soil.