1526438712_Biochemistry_Sem_IV0001.pdf

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Delhi University previous 4th semester question papers. This gonna help student to practice for the final exams. As many questions comes again and again because of limited syllabus.

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Hey, this is my BSc assignment which will help you. It contains the basics about sericulture. I will provide you with a brief about sericulture as well. Sericulture, also known as silk farming, is an ancient practice that involves the cultivation of silkworms for the production of silk. It is a labor-intensive process that requires meticulous care and attention at every stage, from selecting healthy silkworm eggs to the final processing of silk fibers. Sericulture has a rich history that spans thousands of years and has been a significant part of various cultures around the world. The origins of sericulture can be traced back to ancient China, where it was initially kept as a closely guarded secret. The Chinese closely guarded the production techniques and methods, as silk was considered a valuable commodity and a symbol of wealth and luxury. However, the art of sericulture eventually spread to other parts of Asia and later to Europe and the rest of the world. The sericulture process begins with the careful selection of silkworm eggs. Healthy and disease-free eggs are chosen to ensure the quality of the silkworms. These eggs are then incubated under controlled conditions until they hatch into tiny silkworm larvae. The larvae are then placed on specially prepared trays and provided with a diet consisting mainly of mulberry leaves, which are the primary food source for silkworms. Mulberry trees, scientifically known as Morus spp., are cultivated in large quantities to sustain the silk production industry. The leaves of the mulberry trees are rich in nutrients, making them an ideal food source for the silkworms. The silkworms feed voraciously on the leaves, growing rapidly and shedding their skin multiple times in a process called molting. After several weeks of feeding and molting, the silkworms reach their final stage, known as the cocooning stage. During this stage, the silkworms secrete a protein substance called fibroin, which is used to spin their cocoons. The silkworms create a protective covering by spinning a single continuous silk thread around themselves. This spinning process takes about two to three days, and the resulting cocoon is composed of a single thread that can measure several hundred meters in length. To obtain the silk fibers, the cocoons are carefully harvested. However, to prevent the silkworms from breaking the silk thread, the cocoons are usually subjected to a process known as stifling. Stifling involves heating the cocoons or exposing them to steam to kill the silkworms inside. This process also makes it easier to unravel the silk thread from the cocoon. After stifling, the silk thread is carefully unwound from the cocoon. This process is called reeling, and it requires skill and precision to ensure the quality of the silk fibers. Several strands of silk thread are combined to create a stronger and more durable silk yarn. The yarn is then cleaned to remove any impurities and twisted into a usable form.

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Bollworms are among the most damaging pests in cotton cultivation, affecting the bolls where the cotton fibers are formed. There are several species of bollworms, each capable of causing significant yield loss and quality degradation if not effectively managed. Here’s a detailed look at the primary bollworm species affecting cotton: Cotton Bollworm (Helicoverpa armigera): Also known as the corn earworm or the Old World bollworm, this pest is found in many regions around the world. It is highly polyphagous (feeds on many different plants) and poses a threat not only to cotton but also to maize, tomatoes, and legumes. The larvae bore into the cotton bolls, feeding on the developing seeds and fibers, which can lead to boll rot. Pink Bollworm (Pectinophora gossypiella): A significant pest of cotton, the pink bollworm larvae infest the cotton bolls, feeding on the seeds and lint. This can severely damage or destroy the bolls. In regions where pink bollworms are prevalent, they have been a major driver for the adoption of genetically engineered Bt cotton, which expresses a bacterium gene toxic to certain insects. Tobacco Budworm (Heliothis virescens): Closely related to the cotton bollworm, the tobacco budworm primarily attacks tobacco but is also a common pest in cotton. It primarily damages the flowers and bolls of the cotton plant. Differentiating between the tobacco budworm and the cotton bollworm based on appearance can be challenging, but it is crucial for effective management. American Bollworm (Helicoverpa zea): Known in some regions as the corn earworm, it is similar in behavior to Helicoverpa armigera and poses a threat to a variety of crops, including cotton. The larvae attack the cotton bolls, leading to direct damage to the cotton lint and seeds. Management Strategies: Cultural Controls: Crop rotation, destruction of crop residues, and deep plowing can help break the pest’s life cycle. Timing of planting can also be adjusted to avoid peak pest infestation. Biological Controls: Natural enemies like Trichogramma wasps, which parasitize bollworm eggs, and predators such as lacewings and ladybugs can be encouraged. Bacillus thuringiensis (Bt) products can also be sprayed, which are particularly effective against young larvae. Chemical Controls: Insecticides may be required when infestation levels exceed economic thresholds. However, resistance management must be considered, alternating modes of action to avoid developing resistance. Genetic Approaches: Bt cotton, genetically modified to express Bacillus thuringiensis toxin, has been highly effective in controlling bollworms and has dramatically reduced the reliance on chemical insecticides. Monitoring and Scouting: Regular field scouting and using pheromone traps to monitor adult populations can help in timely and targeted application of control measures. The effective management of bollworms often requires an integrated approach

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