• Indole-3-Acetic Acid (IAA) Production in Plant Parasitic Nematodes:
• Hormonal Hypertrophy and Galling: Endogenous biosynthesis or accumulation of auxin (IAA, a tryptophan metabolite) has been detected in salivary glands and body extracts of gall-inducing nematode genera, notably Meloidogyne (inducing root knot hyperplasia and hypertrophy) and Ditylenchus (inducing shoot, leaf, and stem swellings/galls).
• Physiological Effect: The secreted auxin triggers localized host cell enlargement, forming multinucleate giant cells or gall tissue.
• Conclusion: Found in species of Meloidogyne and Ditylenchus (Option 1).

Correct option: (1) Meloidogyne and Ditylenchus

• Types of Statistical Errors in Hypothesis Testing:
• Type II Error ($\beta$): Defined as accepting (failing to reject) the null hypothesis ($H_0$) when in reality the alternative hypothesis is true ($H_0$ is false). Statement (A) is correct.
• Type I Error ($\alpha$): Defined as rejecting the null hypothesis ($H_0$) when in reality the null hypothesis is true. Statement (B) is correct.
• Conclusion: Both statements (A) and (B) are correct (Option 3).

• Mathematical Definition of Standard Deviation ($s$):
• Formula: In descriptive and inferential statistics, the standard deviation is defined mathematically as the positive square root of the arithmetic mean of the squared deviations of individual observations from their mean:

• Variance: The mean of the squared deviations without taking the square root is the variance ($s^2$). Taking the square root restores the original units of measurement as the standard deviation.
• Conclusion: It is called the standard deviation (Option 3).

Correct option: (3) standard deviation