Lotus root \ x0d \ x0d \ Description: Commonly known as lotus root, it is a large perennial aquatic herb of Nymphaeaceae. Lotus root is the fat rhizome of lotus, which can be eaten raw or made into lotus root powder or preserved lotus root. \x0d\\x0d\ The use of holes: The size, shape, structure and so on of plants are constantly evolved for the need of survival in the long-term evolution. Porous lotus root is the underground stem of lotus, which is used to store nutrients, but many people mistake it for the root of lotus. Plants need sunlight, water and air to grow, while lotus roots grow in the mud at the bottom of the pond, and there is little air in the mud. In order to make students grow up, the lotus, which is not stained with sludge, thought of a way: to supplement the air for the underground lotus root with the air holes on the leaves and petioles on the water surface. The petiole of the lotus is hollow, and air passes through the middle of the petiole and enters the lotus root. There are many roots between the nodes of the lotus root, so the air is transmitted to the roots through the holes of the lotus root, thus ensuring the air needed for the growth of the lotus root. During the growing period of lotus, if the lotus leaves are broken or the holes in the lotus root are blocked, the lotus will wither in a few days. This further shows that the lotus root hole is the passage of air. \x0d\\x0d\ Benefits: Lotus root is rich in protein, fat, carbohydrates, calcium, phosphorus, iron, carotene, vitamin C, vitamin B 1, vitamin B2, niacin and so on. Lotus root tastes dry and cold, cold food clears heat, and hot food stimulates appetite and strengthens the spleen. Li Shizhen, a master of medicine in Ming Dynasty, called it "Linggen", which shows its value. Its meat is crisp, tender and sweet when eaten raw, and its cooked food is soft and delicate, so it is a good daily edible vegetable. Lotus root has the dual characteristics of fruit and vegetable, and has good medicinal value, which can be called fruit, vegetable and medicine.