PAUL RAPSON / SCIENCE PHOTO LIBRARY PAUL RAPSON / SCIENCE PHOTO LIBRARY
Grains of wheat (Triticum sp.). Wheat is a grass, and is one of the world's major cereal crops. The grains, part of a structure called the ear at the top of a wheat stalk, are rich in carbohydrates. The grain is ground to make flour, which is used to make bread and other food products.
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