Essential oil is mainly comprised of | Agrigyan

Q.1

Soil Science- ICAR JRF/SRF 2024 (Q.52)

MCQ (Single Correct) +4 −1

Essential oil is mainly comprised of

Monoterpenes Diterpenes Limonins Acetogenins

Q.2

Soil Science- ICAR JRF/SRF 2024 (Q.53)

MCQ (Single Correct) +4 −1

Pungent principle of chilli is

Capxanthin Capsaicin Chalcone Capsirubin

Q.3

Soil Science- ICAR JRF/SRF 2024 (Q.103)

Match the Following +4 −1

Match List-I with List-II:

Choose the correct answer from the options given below:

List - I सूची - I Soil Structural Class List-I (Soil Structural Class		List - II सूची - II Morphological Description List-II (Morphological Description
A	Blocky Blocky	I	All three dimensions of peds are about the same size, with angular or subangular faces; common in B horizon All three dimensions of peds are about the same size, with angular or subangular faces; common in B horizon
B	Prismatic Prismatic	II	Peds are elongated vertically with flat angular tops; common in arid/semiarid subsurfaces Peds are elongated vertically with flat angular tops; common in arid/semiarid subsurfaces
C	Platy Platy	III	Horizontal axis is longer than vertical axis; flat plate-like peds that restrict vertical infiltration Horizontal axis is longer than vertical axis; flat plate-like peds that restrict vertical infiltration
D	Spherical / Granular Spherical / Granular	IV	Small, rounded peds formed by biotic activity in surface A horizons promoting infiltration and aeration Small, rounded peds formed by biotic activity in surface A horizons promoting infiltration and aeration

(A) - (ill), (B) - (I), (C) - (IY), (B) - 0) (A) - (Il), (B) - (Ill), (C) - (IV), (B) - (1) (A) - (II), (B) - (III), (C) - (1), (D) - (IV) (A) - (1), (B) - (lll), (C) - (IV), (B) - (Hh)

Q.4

Soil Science- ICAR JRF/SRF 2024 (Q.112)

MCQ (Single Correct) +4 −1

The van Bemmelen factor in soil science is

1472 1427 1724 1742

खंड अ: सामान्य कृषि

6 टॉपिक्स

शस्य विज्ञान, जुताई एवं फसल उत्पादन कृषि कीट विज्ञान, सूत्रकृमि विज्ञान एवं फसल सुरक्षा मृदा विज्ञान, पादप पोषण एवं सुधार कोशिका विज्ञान, पादप कार्यिकी एवं जैव रसायन कृषि मौसम विज्ञान एवं जलवायु विज्ञान फसल आनुवंशिकी, पादप प्रजनन एवं आईपीआर

Pedology

4 टॉपिक्स

Dokuchaev Pedological Concepts, Soil Profile Horizons & Comprehensive Soil Taxonomy (12 Soil Orders, Epipedons, Subsurface Horizons) Earth's Crust Geochemistry, Rock Weathering, Weathering Indices & Pedogenic Processes (Addition, Loss, Translocation, Transformation) Soil Survey Methodologies, Remote Sensing, GIS Mapping & Major Soil Groups of India (Alluvial, Black, Red, Laterite, Desert) Moisture and Temperature Soil Regimes, Land Capability & Fertility Capability Classification (FCC)

Soil Chemistry

3 टॉपिक्स

Surface Chemistry: Diffuse Double Layer (DDL), Zeta Potential, Cation/Anion Exchange Capacity & Lyotropic Adsorption Series Soil Organic Matter: Humus Fractionation (Humic, Fulvic, Humin), Carbon-Nitrogen Dynamics & van Bemmelen Factor (1.724) Clay Mineralogy: Layer Silicates (Kaolinite, Smectite, Illite), Amorphous Minerals & X-Ray Diffraction (XRD) Identification

Soil Fertility

4 टॉपिक्स

Micronutrient Chemistry (Fe, Mn, Zn, Cu, B, Mo): Ionic Strength, Availability Indices & Chelation Equilibria Salt-Affected & Problematic Soils Chemistry: Saline vs Sodic Soils, ESP, SAR, Gypsum Requirement & Liming of Acid Soils Essential Macronutrient Dynamics (N, P, K, S, Ca, Mg): Transformations, Fixation Mechanisms & Soil Solution Equilibrium सक्रिय Soil Testing Principles, Fertilizer Recommendations (STCR), Plant Analysis, Hidden Hunger & Critical Nutrient Limits

Soil Microbiology

3 टॉपिक्स

Soil Enzymes (Dehydrogenase, Urease, Phosphatase), Pesticide Biodegradation & Biofertilizer Inoculant Technology Soil Microbiota Diversity, Rhizosphere Biology & Microbial Ecology (Bacteria, Fungi, Actinomycetes, Protozoa) Biogeochemical Nutrient Transformations: Nitrogen Fixation (Rhizobium, Azotobacter), Nitrification, Ammonification & P/S/Fe Mobilization

Soil Physics

4 टॉपिक्स

Soil Water Retention (pF Curve, Suction Scales, Tensiometry) & Saturated Water Flow (Darcy's Law, Hydraulic Conductivity) Soil Structure, Aggregate Stability, Bulk/Particle Density, Porosity & Crusting Mechanics in Sodic Soils Soil Texture (Stokes' Law Principles & Limitations), Mechanical Particle Size Analysis & Soil Packing Geometry Unsaturated Water Flow, Infiltration Kinetics (Philip's Model), Soil Aeration (ODR), Thermal Regimes & Physical Erosion (USLE)

Statistics

2 टॉपिक्स

Soil Statistical Analysis: Significance Testing (t-Test, F-Test), Correlation, Regression & Geostatistical Spatial Modeling Soil Experimental Designs: CRD, RBD, Latin Square, Factorial Trials & Split-Plot Designs in Pot and Field Studies

Soil Science- ICAR JRF/SRF 2024

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