Quiz_Plant_Pathogen December 8, 2024 by Vijay Wardhan 1. 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. 2. 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. 3. A diseased leaf shows some areas with dead tissue. This symptom is often referred to as : Necrotic spots Chlorosis Galls Blight Explanation:Necrotic spots are areas of dead tissue on leaves or other plant parts, often caused by infections, toxins, or adverse environmental conditions. 4. 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. 5. 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. 6. Chemicals which are applied soon after the outset of infection, suppress the development of pathogen, thus curing the plant, are called : Eradicants Therapeutants Fumicides Protectants Explanation:Therapeutants are chemicals applied after the onset of infection to suppress the development of pathogens and cure the plant. They differ from protectants, which are applied preventively. 7. When a diseased plant is legally stopped from export, this is done under : Biological prevention Curative check Crop improvement Quarantine measure Explanation:Quarantine measures are legal actions taken to prevent the export of diseased plants, thereby controlling the spread of plant diseases. 8. 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. 9. Which of the following is not a viral disease? Tobacco mosaic Red rot of sugarcane Tristeza disease of Citrus Leaf curl of papaya Explanation:Red rot of sugarcane is a fungal disease caused by Colletotrichum falcatum, not a viral disease. The other diseases listed are caused by viruses. 10. Severe famine of West Bengal of 1942-43 was due to destruction of rice crop by a fungus called : Helminthosporium Penicillium Puccinia Rhizopus Explanation:The Bengal famine of 1942-43 was caused by the destruction of rice crops by the fungus Helminthosporium oryzae, leading to severe food shortages and starvation. Loading …
