About 150 types of plant are regularly cultivated as food crops, although thousands more are eaten in local areas. The Most important crops are cereals (grass- like plants), especially maize, rice and wheat. Root crops such as potatoes are commonly grown in temperate climates, and sweet potatoes, yams and cassava are grown in tropical parts. The seeds of the pea family, known as pulses, include beans, soy beans, chickpeas and lentils. They are a particularly valuable source of protein, especially in some parts of the world where meat is in short supply and malnutrition may be commonly encountered.
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