40. 1:}Crop rotation is the practice of growing a series of dissimilar types of crops in the same area in sequential seasons.. In case, there was enough rain, the crops fertilized properly, when there wasn’t enough rain the crops just failed and most parts of the country were hit by famine. Write 4 advantages of mixed cropping. 4) One crop needs comparatively lesser water and nutrients than the other. Examples: (a) Transgenic soybean is developed. 45.Write 4 advantages of crop rotation. This soybean produces monounsaturated fatty acid oleic acid. However, things changed with time. 44.What is crop rotation ? The application of recombinant technique for horizontal transfer of gene in plant sys­tem has several limitations. Thus, component crops used in mixed cropping have different canopy. If you are a student of class 9 who is using NCERT Textbook to study Science, then you must come across Chapter 15 Improvement in Food Resources. It can improve human health. This has the following benefits: (i) Allow farmers to grow multiple rounds of crops in a year. After independence, the government planned to bring about improvement in this sector. IMPROVEMENT IN FOOD RESOURCES . It illustrates different aspects of greenhouse crop production and protection with special emphasis on greenhouse technologies, design and climate control, cropping systems, in particular those practices which help reduce pests and diseases incidence in crops, integrated pest management, the use of adapted cultivars, and the need for The advanced genetic and molecular techniques have resulted in new varieties of crop … 2) One crop is tall growing and other is short growing. The crop canopy means the structure of leaves, stems and flowers found above ground. It is a big change. This CBSE notes contains CBSE Key Notes, CBSE Revision Notes, Short Key Notes, images, diagrams of the complete Chapter 15 titled Improvement in Food Resources of Science taught in class 9. Food Resources: Cereals (Wheat, rice, maize, millets and sorghum) provide us carbohydrates; Pulses (Grams, pea and lentil) provide us proteins; Oil seeds (Soya bean, ground nut, sesame, and castor) provide us fats; Vegetables, spices and fruits provide us a range of minerals, nucleic acids and vitamins. The high-yielding varieties of crops take less time for maturing than the traditional varieties of crops. Plant genome is exceedingly complex, involving a huge amount of DNA, which can accommodate sequences equivalent to 6-7 million genes in an average crop plant. CROP PRODUCTION; ART, SCIENCE AND BUSINESS Crop Production is the art and science of the genetic improvement of crops to produce new varieties with increased productivity and quality. 41.What is intercropping ? 43.Write 4 differences between mixed cropping and intercropping. 46.What are the factors from which crops needs to be protected ? ADVERTISEMENTS: The below mentioned article provides a study note on transgenic plants. 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