Explanation:

 Black gram is a member of the Asiatic Vigna crop group. It is an annual pulse grown mostly as a fallow crop in rotation with rice. Similar to the other pulses, black gram, being a legume, enriches soil nitrogen content and has relatively short (90-120 days) duration of maturity.

Black gram is scientifically known as Phasiolus mungo and it is commonly known as Urad in India. India is its primary origin and is mainly cultivated in Asian countries including Pakistan, Myanmar and parts of southern Asia. About 70%t of world’s black gram production comes from India.