Variance Definition: In agricultural statistics and biometrics, variance (denoted by $\sigma^2$ for population or $s^2$ for sample) is the mean of the squared deviations of individual observations from their arithmetic mean.
Relationship with Standard Deviation: Standard deviation is the positive square root of variance ($\text{SD} = \sqrt{\text{Variance}}$), which means variance is mathematically the square of the standard deviation ($\text{Variance} = \text{SD}^2$). (Correct answer: Option 2)
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ICAR JRF Agronomy 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Ideal range of absorbance for accepting data from spectrophotometer is
Photometric Accuracy & Beer-Lambert Law: In UV-Vis spectrophotometry, photometric accuracy and reproducibility depend on maintaining transmission within the optimal linear dynamic range where the relative error in concentration measurement is minimized.
Ideal Absorbance Range: The optimal absorbance range for analytical measurement is 0.2 to 0.8 (corresponding to ~15% to 65% transmittance), where spectrophotometric detector noise and stray light errors are minimal. (Correct answer: Option 4)
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3
ICAR JRF Agronomy 29 Jun 2024Shift 1
Arranging Order+4−1
What is the correct sequence of amount of normal rainfall distribution during different seasons {Post-Monsoon season
(October-December), Winter season (January-February) and Pre-monsoon season (March-May)} in India?
Crown Root Initiation (CRI): Occurs at 20–25 days (3–4 weeks) after sowing in dwarf wheat varieties.
Critical Moisture Requirement: During this stage, the plant initiates permanent adventitious (crown) roots from nodes situated just 1–2 cm below the soil surface. If the topsoil layer is dry, crown roots fail to establish, leading to severely restricted tiller development, poor nutrient uptake, and lodging.
Conclusion: The crop requires a moist root zone specifically for the development of its adventitious roots. (Correct answer: Option 2)
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