red date
Jujube, also known as jujube, belongs to angiosperms, dicotyledonous plants, Rhamnaceae, Jujube. Its vitamin content is very high, and it has the reputation of "natural vitamin pill", which has the effect of nourishing yin and tonifying yang.
Jujube is a temperate crop with strong adaptability and wide planting range. Jujube is known as the "hardcore crop" and has the characteristics of drought and waterlogging tolerance, so it is the first choice for developing water-saving forest and fruit industry.
2. Apple
Apple (scientific name: Malus pumila) belongs to Malus of Rosaceae, and its tree is a deciduous tree. Apple fruit is rich in minerals and vitamins, and it is one of the fruits that people often eat.
Apple is a low-calorie food, which produces 60 kilocalories per100g. Apple is known as "living water" because of its high solubility and easy absorption by human body. It is beneficial to dissolve sulfur and make skin smooth and tender.
Step 3: bananas
Banana (scientific name: Musa nana? Lour.) Plantago, also known as its fruit, is widely cultivated in tropical areas. Bananas are fragrant and nutritious, and the plants are large herbs, which emanate from rhizomes and form false stems with a height of 3-6 meters (10-20 feet) from the lower part of leaf sheaths. The leaves are oblong to oval, some of which are 3 ~ 3.5 meters long (10 ~1.5 feet) and 65 cm (26 inches) wide,10 ~ 20 clustered stems.
Spikes droop, extracted from the top of false stems, with many flowers and light yellow; The inflorescence is pendulous, resulting in10 ~ 20 strings, about 50 ~150. Plants die after fruiting, and the sucking roots from rhizomes continue to reproduce, and each plant can live for many years. Originated in southeast Asia, it is cultivated in Taiwan Province, Hainan, Guangdong and Guangxi.
4. Pears
Pear, usually a deciduous tree or shrub, with a few evergreen varieties, belongs to Rosaceae, Apple subfamily, a dicotyledonous plant class of angiosperms. The leaves are mostly oval, and the size varies with different varieties. Flowers are white, or slightly yellow and pink, with five petals. The fruit has a round shape, and some have a thin base and a thick tail, which is commonly known as "pear shape";
The pericarp colors of different varieties are quite different, including yellow, green, yellow with green, yellow with yellow in green, yellow-brown, green-brown, reddish-brown, brown, and some varieties are purplish red; The fruit diameter of wild pears is small, ranging from 1 to 4 cm, while the fruit diameter of artificially cultivated varieties can reach 8 cm and the length can reach 18 cm.
Pear fruit is usually used for eating, which is not only delicious and juicy, sweet and sour, but also nutritious, containing a variety of vitamins and cellulose. Different kinds of pears have completely different tastes and textures. Pears can be eaten raw or cooked. In terms of medical efficacy, pears can relieve constipation, facilitate digestion, and are also good for cardiovascular system. In the folk, pears also have a curative effect. Peeling pears, adding rock sugar, and eating them after cooking can also relieve cough; Besides being eaten as fruit, pears can also be used for viewing.
5.pineapple
Pineapple (scientific name: Ananas comosus) is one of the tropical fruits. Fujian and Taiwan Province are called Wangli or Wanglai (? ng-l? I) The area around Singapore and Malaysia is called yellow pear, and the mainland and Hong Kong are called pineapple. There are more than 70 varieties, one of the four famous fruits in Lingnan.
Pineapple originated in the Amazon River valley of Brazil and Paraguay in South America, and was introduced to China from Brazil in the16th century. Now it has spread to the whole tropical region. Its edible part is mainly composed of inflorescence axis with increased meat quality and flowers arranged spirally around it. The flowers are usually not strong, and the persistent perianth lobes enclose a cavity, in which atrophic stamens and styles are hidden. The fiber of leaves is very tough and can be used for weaving, rope making, netting and paper making. ?
Pineapple and pineapple are biologically the same kind of fruit. In the market, pineapple and pineapple are different kinds of fruits: after pineapple is peeled, there are "internal thorns" that need to be removed; However, there is no "internal thorn" after the pineapple skin is removed, and it does not need a knife to draw a ditch. ?
Extended data:
The structure of vitamin C is similar to glucose, and it is a polyhydroxy compound. Two adjacent enolic hydroxyl groups in the second and third positions of its molecule are easily dissociated to release H+, so it has the nature of acid, also known as ascorbic acid.
Vitamin C has strong reducibility and can be easily oxidized to dehydrovitamin C, but its reaction is reversible, and ascorbic acid and dehydroascorbic acid have the same physiological function. However, if dehydroascorbic acid continues to be oxidized to generate diketonate, the reaction will be irreversible and completely lose its physiological efficacy.
References:
Vitamin c_ Baidu Encyclopedia Jujube _ Baidu Encyclopedia Apple (Rosaceae Apple Fruit) _ Baidu Encyclopedia Banana (Musaceae) _ Baidu Encyclopedia Pear (Rosaceae Pear Plant) _ Baidu Encyclopedia Pineapple _ Baidu Encyclopedia