The van Bemmelen factor in soil science is | 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

General Agriculture

6 Topics

Agronomy, Tillage & Field Crop Production Agricultural Entomology, Nematology & Crop Protection Soil Science, Plant Nutrition & Reclamation Cell Biology, Plant Physiology & Biochemistry Agricultural Meteorology & Climate Science Crop Genetics, Plant Breeding & IPR

Pedology

4 Topics

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 Topics

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 Topics

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 Active Soil Testing Principles, Fertilizer Recommendations (STCR), Plant Analysis, Hidden Hunger & Critical Nutrient Limits

Soil Microbiology

3 Topics

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 Topics

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 Topics

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

120 Questions Bilingual

RPSC Agriculture Exams

5 Exams

Food Safety Officer Assistant Agriculture Officer Agriculture Officer RPSC Agriculture Research Officer RPSC AARO

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RSSB Agriculture Supervisor

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4 Exams

ICAR AIEEA PG CUET UG Rajasthan Agriculture Pre-PG ICAR JRF/SRF