Alluvial soils in Kerala are found mainly along:

The correct answer is b) River basins.

Alluvial soils are formed by the deposition of sediment from rivers. They are typically found in river valleys and floodplains. Alluvial soils are very fertile and are often used for agriculture.

Coastlines are not a good place to find alluvial soils because the waves and tides tend to erode the soil. Hill slopes are also not a good place to find alluvial soils because the soil is often washed away by rain. Plateaus are also not a good place to find alluvial soils because the soil is often too dry and rocky.

Here are some additional details about each option:

• Option a) Coastlines: Coastlines are not a good place to find alluvial soils because the waves and tides tend to erode the soil. The soil on coastlines is also often sandy and not very fertile.
• Option b) River basins: River basins are the areas of land that are drained by a river. Alluvial soils are typically found in river valleys and floodplains. Alluvial soils are very fertile and are often used for agriculture.
• Option c) Hill slopes: Hill slopes are not a good place to find alluvial soils because the soil is often washed away by rain. The soil on hill slopes is also often too dry and rocky.
• Option d) Plateaus: Plateaus are large areas of flat land that are raised above the surrounding land. Plateaus are also not a good place to find alluvial soils because the soil is often too dry and rocky.