Solution:'Yava' and 'Dhanya' are terms used for cereals in the Rigveda.Yava This term often refers to barley, a staple grain in ancient Indian agriculture.
Dhanya A broader term that encompasses various grains, including barley, wheat and rice. It sometimes denotes the general concept of grain or cereal.
While, these are two of the most common terms, the Rig Veda also uses other words to describe different types of grains and their products. The specific terms might vary depending on the context, the type of grain being discussed or the poetic imagery employed in the hymns.