1:}Crop rotation is the practice of growing a series of dissimilar types of crops in the same area in sequential seasons.. Chapter 15 CBSE Notes for Class 9 Download Free 1. The application of recombinant technique for horizontal transfer of gene in plant sys­tem has several limitations. It is a big change. 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. Examples: (a) Transgenic soybean is developed. 46.What are the factors from which crops needs to be protected ? It can improve human health. 43.Write 4 differences between mixed cropping and intercropping. Write 4 advantages of mixed cropping. Several genes […] (ii) Short duration reduces the cost of crop production, (iii)Uniform maturity makes the harvesting process easy and reduces loss during harvesting. The advanced genetic and molecular techniques have resulted in new varieties of crop … ADVERTISEMENTS: The below mentioned article provides a study note on transgenic plants. 42.Write 4 advantages of intercropping. Thus, component crops used in mixed cropping have different canopy. 40. 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 A traditional element of crop rotation is the replenishment of nitrogen through the use of green manure in sequence with cereals and other crops. ment of the sporophyte – note: lower plants often have this. 47.What is a pest ? After independence, the government planned to bring about improvement in this sector. However, things changed with time. 44.What is crop rotation ? This soybean produces monounsaturated fatty acid oleic acid. 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. 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. The crop canopy means the structure of leaves, stems and flowers found above ground. 45.Write 4 advantages of crop rotation. Crop rotation confers various benefits to the soil. 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. This has the following benefits: (i) Allow farmers to grow multiple rounds of crops in a year. 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. The high-yielding varieties of crops take less time for maturing than the traditional varieties of crops. 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