बिहार की किस मिट्टी में लोहांश की मात्रा अधिक और जीवांश की मात्रा कम पाई जाती है ? - In which soil of Bihar, the amount of iron is found to be high and the amount of biomass is found to be less? - Bihar Ki Kis Mitti Me lohansh Ki Matra Adhik Aur Jeevansh Ki Matra Kam Pai Jati Hai ? Bihar Gk in hindi, Land and Soil Laal Mitti question answers in hindi pdf Tarai Mitti questions in hindi, Know About Abhrak Mitti Bihar Gk online test Bihar Gk notes in hindi quiz book Bangar Mitti