An explanatory article

Apple is a kind of fruit that everyone is familiar with. It is chubby and covered with red harvest. Hold it in your hand and it will gently stick to your palm. When you choose it from thousands of apple trees in Qian Qian, it is a kind of happiness. It can bring sweetness to people, which is its greatest happiness. Apple is a kind of fruit that grows in the north. The idiom "fruitful" refers to it. Every time you walk through an apple orchard, its attractive fragrance will enter your nostrils and even your whole body with the breeze, and that long-lost comfort will gush out from your long-buried nerves. What could be easier than this? Let me introduce apples!

The height of flowering deciduous trees of apple trees can reach 15 meters, and it is generally 3-5 meters high under cultivation conditions. The trunk is grayish brown, the old bark has irregular longitudinal cracks or flaking, and the branchlets are smooth. The leaf sequence is simple and alternate, oval to ovoid, and the leaf margin is serrated. Corymb with white petals, pink buds, 20 stamens and 5 styles. Fruit is a kind of kernel, and its color and size vary with varieties.

Apples like light, slightly acidic to neutral soil. It is most suitable for sandy soil with deep soil layer, rich organic matter and good ventilation and drainage of core soil. There are more than 7500 known varieties. Improved varieties: "Red Star Series", "Red Fuji" and "Jonathan". In addition to fresh varieties, there are apples for cooking. Because the fruit acid of apple has the function of retaining water, it is suitable for baking Apples contain a lot of pectin, which is a soluble fiber that can reduce cholesterol and bad cholesterol. It can also control asthma and chronic obstructive pneumonia.

Apples have a special effect on enhancing children's memory. Apple not only contains a variety of vitamins, lipids, minerals, sugars and other essential nutrients for the brain, but also contains fine fibers beneficial to children's growth and development and zinc that can enhance children's memory. Zinc is an essential element that constitutes the nucleic acid and protein closely related to memory. Zinc deficiency will lead to the hypoplasia of hippocampus on the edge of cerebral cortex. Once zinc in food is reduced, children's memory and learning ability will be seriously damaged, which can last until adulthood. In order to make children have a good memory, children should be allowed to eat more apples.

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