Quiz_Plant_Pathogens 1. The disease symptom necrosis refers to : Dead corky areas Rough crust-like lesions Dead tissues Burnt areas on the leaves Explanation:Necrosis is the death of plant cells or tissues, often resulting in dark, dead areas on leaves, stems, or other parts of the plant. It can be caused by various factors including pathogens and environmental stress. 2. Black rust of wheat is caused by: Puccinia Yeast Rhizopus Penicillium Explanation:Black rust of wheat, also known as stem rust, is caused by the fungus Puccinia graminis. It is a serious disease that affects wheat crops worldwide. 3. Downy mildew disease is caused by : Puccinia Peronospora Phytophthora Albugo Explanation:Downy mildew is caused by various species of the genus Peronospora. This disease affects a wide range of plants, leading to the appearance of downy growth on the underside of leaves and significant crop damage. 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. Quarantine regulations are concerned with: Prevention of entry of diseased plants in the country Spraying of diseased plants with insecticides Promotion of dry farming in sandy soil Growing of fruit trees in every state Explanation:Quarantine regulations aim to prevent the introduction and spread of diseased plants into a country, thereby protecting local agriculture from potential outbreaks. 6. A disease is abnormal state that may result due to : Mineral Environment All of these Pathogen Explanation:Diseases can be caused by various factors including environmental conditions, mineral deficiencies, or pathogens such as bacteria, viruses, and fungi. 7. Red rot of sugarcane is caused by : Helminthosporium Puccinia Colletotrichum Ustilago Explanation:Red rot of sugarcane is a fungal disease caused by Colletotrichum falcatum. It is a major disease affecting sugarcane crops, leading to significant yield losses. 8. Which of the following is not a correct match? Cercospora-Tikka disease of groundnut Helminthosporium-Bengal famine Melampsora-Red rust of tea Aspergillus parasiticus-Aflatoxin Explanation:Melampsora is not associated with red rust of tea. Red rust of tea is caused by Cephaleuros virescens, a green alga. 9. 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. 10. Pythium debaryanum is the causative agent of: Black wart disease of potato Powdery mildew Soft rot of sweet potato Damping off of seedling Explanation:Pythium debaryanum is a soil-borne pathogen that causes damping-off, a disease that affects seedlings, leading to their collapse and death. Loading …
