Question:
Given below are two statements
Statement I: Viruses are the only pathogens transmitted by nematodes
Statement II: Biotic agents associated with plants are known to transmit plant pathogens
In light of the above statements, choose the most appropriate answer from the options given below
Given below are two statements
Statement I: Viruses are the only pathogens transmitted by nematodes
Statement II: Biotic agents associated with plants are known to transmit plant pathogens
In light of the above statements, choose the most appropriate answer from the options given below
Statement I: Viruses are the only pathogens transmitted by nematodes
Statement II: Biotic agents associated with plants are known to transmit plant pathogens
In light of the above statements, choose the most appropriate answer from the options given below
Show Hint
Nematode-transmitted viruses often have polyhedral or tubular shapes.
Always be careful with absolute words like "only" in biology questions.
Always be careful with absolute words like "only" in biology questions.
Updated On: Aug 24, 2026
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question focuses on the vectors (carriers) of plant diseases and the specific role of nematodes in pathogen transmission.
Step 2: Detailed Explanation:
• Statement I Analysis: While nematodes are well-known vectors for several plant viruses (e.g., Nepoviruses like Xiphinema and Tobraviruses like Trichodorus), they are not restricted to viruses.
Nematodes can also carry bacteria. A classic example is Anguina tritici (seed gall nematode), which acts as a vector for the bacterium Rathayibacter toxicus (causing yellow ear rot in wheat).
Thus, Statement I is Incorrect.
• Statement II Analysis: Pathogens often lack independent means of moving between hosts.
Various biotic agents (living organisms) like insects, mites, fungi, and nematodes serve as essential vectors for viruses, bacteria, and phytoplasmas.
This is a well-established principle in plant pathology.
Thus, Statement II is Correct.
Final Answer:
Statement I is too restrictive and false, while Statement II correctly summarizes a key concept in disease transmission.
The question focuses on the vectors (carriers) of plant diseases and the specific role of nematodes in pathogen transmission.
Step 2: Detailed Explanation:
• Statement I Analysis: While nematodes are well-known vectors for several plant viruses (e.g., Nepoviruses like Xiphinema and Tobraviruses like Trichodorus), they are not restricted to viruses.
Nematodes can also carry bacteria. A classic example is Anguina tritici (seed gall nematode), which acts as a vector for the bacterium Rathayibacter toxicus (causing yellow ear rot in wheat).
Thus, Statement I is Incorrect.
• Statement II Analysis: Pathogens often lack independent means of moving between hosts.
Various biotic agents (living organisms) like insects, mites, fungi, and nematodes serve as essential vectors for viruses, bacteria, and phytoplasmas.
This is a well-established principle in plant pathology.
Thus, Statement II is Correct.
Final Answer:
Statement I is too restrictive and false, while Statement II correctly summarizes a key concept in disease transmission.
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