Quiz_Plant_Pathogens 1. An excessive enlargement of diseased organ because of increase in the number of cells is called : Hyperplasia Hypertrophy Damping off Necrosis Explanation:Hyperplasia refers to the increase in the number of cells in an organ or tissue, causing its enlargement. This is a common response to a stimulus and can be seen in various diseases. 2. Which of the following is the most destructive enemies of mankind? Rust of wheat Apple scab Damping off disease Early blight of potato Explanation:Rust of wheat, caused by Puccinia species, is one of the most destructive plant diseases affecting wheat crops, leading to significant yield losses and threatening food security. 3. Body disorders due to harmful physiological changes are known as : Pathology Disease Susceptibility Infection Explanation:Diseases are disorders caused by harmful physiological changes in an organism, leading to impaired function and health. 4. Leaf spot of groundnut is caused by : Piricularia Sclerospora Cercospora Helminthosporium Explanation:Cercospora arachidicola is the pathogen responsible for leaf spot disease in groundnut. This disease is characterized by circular lesions on the leaves, which can lead to significant yield loss if not controlled. 5. The inability of a plant to resist the effects of a pathogen or any other damaging factors is known as : Predisposition Susceptibility Virulence Resistance Explanation:Susceptibility is the inability of a plant to resist the effects of pathogens or other damaging factors, making it more prone to disease. 6. Helminthosporium oryzae was the cause of disaster : Collapse of French industry in 1870 Irish famine is 1845 Bengal famine in 1943 Displacement of planters in Ceylon in 1867 Explanation:Helminthosporium oryzae caused the Bengal famine of 1943 by devastating rice crops, leading to widespread food shortages and famine. 7. Which of the following is not a fungal disease? Red rust of tea Rust disease of crucifers Rust of wheat Rust of coffee Explanation:Red rust of tea is caused by the alga Cephaleuros virescens, not by a fungus. The other diseases listed are caused by fungal pathogens. 8. Which of the following statements is not correct? The smut spores cause enormous loss by damaging the crops The smuts commonly attack the reproductive structures of the plant The life cycle of smut is considerably less complicated than that of rusts The smuts commonly attack stem, leaves and roots Explanation:Smuts primarily attack the reproductive structures of plants, such as flowers and seeds, rather than stems, leaves, and roots. 9. The pathogen that causes covered smut of Sorghum is : Sphacelotheca Colletotrichum Cercospora Helminthosporium Explanation:Sphacelotheca is the pathogen responsible for covered smut in Sorghum, a disease that affects the grains and can lead to significant crop losses. 10. Chief constituents of bordeaux mixture are : Calcium oxide, copper sulphate, water Calcium sulphate, copper carbonate and water None of the above Calcium carbonate, copper carbonate and water Explanation:Bordeaux mixture is a fungicide composed of calcium oxide, copper sulphate, and water, widely used to control fungal diseases in plants. Loading …
