Cereals are grains which are edible. They are consumed by humans,animals,etc.
Example: Maize, wheat, etc.
Pulses are obtained from leguminous plants which have a high protein value.
Example: Dal, beans ,etc.
Spices are edible substances obtained from various parts of plant after processing them.They are used to provide flavour,color & provide good smell to the food.
Example : Saffron( obtained from dried stigma of flowers),etc.