Rice, Wheat and Maize are rich in

Hint: The edible seeds or grains are referred to as cereals. Rice, wheat, maize, barley, millet and sorghum are cultivated in different parts of the world and they are examples of cereals.

Complete answer:
Cereals are known to be the most common important food and major energy source. Rice, wheat, and maize are commonly cultivated in cereal. Cereals are known to be rich in minerals, vitamins, fats and proteins, carbohydrates, which provides more energy. Cereals play an important and largest contribution to human nutrition. The major cereals in the world are rice, wheat and maize. All cereals belong to the family Gramineae. Cereals are considered as the staple food and a very important part of the human diet.

Rice, wheat, Maize are rich in starch ( carbohydrates). The most common form of carbohydrate present in foods is starch. Starch is composed of long chains of glucose called amylose and amylopectin.
Cereals also contain nutrients like vitamins, vitamin E, minerals and proteins. About 6-15 % of protein content is present in crops. The cereals also contain sugars like fructose sucrose, maltose but in very low concentrations. Few lipids are present in cereals.

Thus, the correct answer is rice, wheat and maize are rich in starch (carbohydrates).

Note: Cereals are a good source of potassium but contain very less sodium. Cereals also contain minerals like zinc, magnesium, iron, and selenium. Cereals contain 75% of carbohydrates and they are referred to as carbohydrate-rich food. Starch is known to be a major component of cereals; they are present in the form of granules.