Inceptisols, Entisols, Vertisols and Mollisols are orders of which one of the following?

Which one of the following is an organic soil?

Which one of the following soils is deposited by rivers?

Which one of the following is the main cause of soil erosion in arid and semi-arid regions of India?

Which one of the following is not a soil forming factor ?

Which one of the following crop enriches the Nitrogen content in soil?