Correct Option
The correct option is Ragi.
Explanation
Millets, often referred to as "Nutri-cereals," are coarse grains known for their high nutritional value compared to fine cereals like rice and wheat. They are particularly valued for their mineral content, dietary fiber, and resilience to dry climatic conditions.
Detailed Analysis
- Ragi (Finger Millet): According to standard agricultural texts , Ragi is explicitly described as being very rich in iron, calcium, other micronutrients, and roughage. It possesses the highest calcium content among all cereals (approximately 344 mg per 100g).
- Bajra (Pearl Millet): While Bajra is known for a high iron content, Ragi is the specific crop highlighted for the combination of iron and exceptional calcium levels in the context of Indian agriculture.
- Jowar (Sorghum): Jowar is rich in potassium, phosphorus, and calcium, but its mineral density is lower than that of Ragi.
- Maize: Maize is a crop used as both food and fodder. While it contains carbohydrates and vitamins, it is not the richest source of iron or calcium among the options provided.
Key Takeaway: Ragi (Finger Millet) is the richest source of Calcium among all cereals and is also significantly rich in Iron and roughage.