1. How is organic farming different from conventional farming?---Organic farming is different from conventional farming because there is no any genetic engineering,pesticides ,fertilizers, it is a totally native farming and farmer just try their best to provide a best sunshine and heat for plant, they will not do any synthetic or artificial.

2. What is the nutrition value of organic food? Provide examples from the article.---Some researchers found that the level of bioflavinoids,quercetin and kaempferol were 79 percent and 97 percent higher in organic tomatoes .In addition, organic food have higher level of Vitamin C. And it have more total carbon and nitrogen, greater microbial biiomass and some good things good.

3. How do organic practices improve the soil quality?
--- Using a simple word to say is"giving is more than losing".There is a research center which called USDA-ARS research showed that farmer should put more manure and cover crops on soil and more over than offset losses.
4. Why is organic production expensive?

---The organic production is expensive because organic food need no pollution, no chemical stimulation, no insect damage, it has really high requirement to farm them. Farmer should pay much attention to take care plants, and they should design a perfect system that make plants not only have enough clean space but also have enough heat. Organic food need expensive machine and management to keep it have high quality. So it is really expensive.