Bacterial Diseases of Plants
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Questions and Answers

What are the primary agents responsible for disseminating plant pathogenic bacteria?

  • Wind, soil, and sunlight
  • Water, insects, other animals, and humans (correct)
  • Pollinators, decomposers, and microorganisms
  • Fungi, nematodes, and viruses

    • What role do humans play in the dissemination of plant pathogenic bacteria?

  • They have no role in the dissemination of plant pathogenic bacteria
  • They produce antibiotics to combat the bacteria
  • They act as a vector for the bacteria to spread to other plants (correct)
  • They provide a habitat for the bacteria to grow

    • Which of the following is NOT a primary means of dissemination for plant pathogenic bacteria?

  • Soil (correct)
  • Humans
  • Water
  • Insects

    • What is the primary purpose of understanding the dissemination of plant pathogenic bacteria?

    <p>To prevent the spread of plant diseases</p> Signup and view all the answers

    Which of the following organisms can disseminate plant pathogenic bacteria?

    <p>Insects</p> Signup and view all the answers

    What is a possible way that bacteria can be transferred among plants?

    <p>On the bodies of moving animals</p> Signup and view all the answers

    Which of the following animals can potentially carry bacteria on their bodies?

    <p>Any animal that moves among plants</p> Signup and view all the answers

    What is the role of animals in the transfer of bacteria among plants?

    <p>They are passive carriers of bacteria</p> Signup and view all the answers

    Why are animals moving among plants important for the transfer of bacteria?

    <p>They can physically move bacteria from one plant to another</p> Signup and view all the answers

    What is the result of animals moving among plants with bacteria on their bodies?

    <p>Bacteria are transferred among plants</p> Signup and view all the answers

    What is the primary goal of treating seed with hot water at 52°C for 20 minutes?

    <p>To reduce the number of infected seeds</p> Signup and view all the answers

    At what temperature is seed treatment typically done to reduce bacterial infection?

    <p>52°C</p> Signup and view all the answers

    What is the duration of hot water treatment for seed to effectively reduce bacterial infection?

    <p>20 minutes</p> Signup and view all the answers

    What is the expected outcome of treating seed with hot water at 52°C for 20 minutes?

    <p>Considerable reduction in the number of infected seeds</p> Signup and view all the answers

    What is the primary mechanism of hot water treatment in controlling bacterial diseases of plants?

    <p>Killing bacterial pathogens on the seed surface</p> Signup and view all the answers

    What is the pattern of toxin spread from the point of infection?

    <p>Radially</p> Signup and view all the answers

    What is formed around the bacteria-containment spot?

    <p>Chlorotic halo</p> Signup and view all the answers

    What is the characteristic of the cells in the chlorotic halo?

    <p>Free of bacteria</p> Signup and view all the answers

    What is the location of the bacteria-containing spot?

    <p>At the center of the chlorotic halo</p> Signup and view all the answers

    What is the significance of the chlorotic halo?

    <p>It indicates the presence of bacteria</p> Signup and view all the answers

    What is the characteristic of the spots on the leaves of infected plants?

    <p>They are yellowish with brown centers and whitish-yellow halos</p> Signup and view all the answers

    What is the outcome for some seedlings in the seedbed or after transplantation?

    <p>They are killed</p> Signup and view all the answers

    What occurs between the rotting and healthy tissues of infected plants?

    <p>A water-soaked zone separates them</p> Signup and view all the answers

    How large can the brown spots on infected leaves become?

    <p>2 to 3 centimeters in diameter</p> Signup and view all the answers

    What is the color of the halos surrounding the brown spots on infected leaves?

    <p>Whitish-yellow</p> Signup and view all the answers

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