Given below are two statements:
Statement I: Pyricularia oryzae toxin is a specific toxin.
Statement II: Helminthosporium oryzae toxin is a non-specific toxin.

Correct option is B

• Pyricularia oryzae does not produce a toxin that is classified as a clearly defined specific (host-specific) toxin.
• Therefore, Statement I is incorrect.
• Helminthosporium oryzae toxin is not strictly categorized as a classic non-specific toxin in standard toxin classification used in plant pathology exams.
• Its pathogenicity is mainly due to enzymes and general metabolites rather than a well-defined non-specific toxin.
• Therefore, Statement II is also incorrect.
• Since both statements are incorrect, option B is correct.

Information booster (related facts):

• Host-specific toxins (pathotoxins) show specificity to host genotypes.
• Many fungal pathogens damage host tissues mainly through enzymes rather than true toxins.
• Pyricularia oryzae causes rice blast primarily via enzymatic degradation and infection structures.
• Helminthosporium oryzae (brown spot of rice) does not have a well-established toxin classification in competitive exam syllabi.

Why other options are incorrect:

• Option A: Incorrect because neither statement is fully correct.
• Option C: Incorrect because Statement II is also incorrect.
• Option D: Incorrect because Statement II cannot be considered correct as per standard exam classification.