RPSC Rajasthan AARO Agricultural Chemistry 2018 Solved Paper (English) — Agri Master Mind
Specific heat of quartz among the different soil constituents is. (RJ AARO Agri.Chemistry 2018)
- lowest
- highest
- similar to other constituents
- variable
The pF value of saturated soil and oven-dry soil is (RJ AARO Agri.Chemistry 2018)
- and 14
- and 7
- and 14
- and 7
The available water retained in soil is between (RJ AARO Agri.Chemistry 2018)
- to 3 bar
- -1 to -1/3 bar
- to 30 bar
- -1/3 to -15 bar
At field capacity, the moisture is held with soil water potential (RJ AARO Agri.Chemistry 2018)
- < 1 bar
- < 0.5 bar
- < 1/3 bar
- > 1/3 bar
In the gravimetric method of soil moisture measurement, the soil is oven dried at (RJ AARO Agri.Chemistry 2018)
- °-100 °C
- °-110 °C
- °-120 °C
- °-130 °C
Which of the following methods of measurement of soil moisture is considered as a check for all other methods? (RJ AARO Agri.Chemistry 2018)
- Electrical conductivity method
- Tensiometer method
- Gravimetric method
- Neutron probe method
Estimate the percent moisture in a given: Weight of moist soil + box = 200 gm Weight of oven-dry soil + box = 160 gm Weight of empty box = 50 gm (RJ AARO Agri.Chemistry 2018)
- %
- %
- %
- %
Moisture content of soil at a point where the soil water mass flows under an applied force and fails to retain its shape is called (RJ AARO Agri.Chemistry 2018)
- Plastic index
- Non-plastic
- Lower plastic limit
- Upper plastic limit
Presence of silica, lime and other salts in soil, the colour of soil appears like (RJ AARO Agri.Chemistry 2018)
- Dark coloured
- Brown coloured
- Red coloured
- Light coloured
Presence of organic matter and iron oxides in the soil, the color of soil appears like (RJ AARO Agri.Chemistry 2018)
- Red colour
- Brown colour
- Dark colour
- Yellow, red colour
The general relative order of anion exchange is (RJ AARO Agri.Chemistry 2018)
- NO₃⁻ > OH⁻ > H₂PO₄⁻ > SO₄²⁻
- OH⁻ > H₂PO₄⁻ > SO₄²⁻ > NO₃⁻
- SO₄²⁻ > NO₃⁻ > OH⁻ > H₂PO₄⁻
- H₂PO₄⁻ > SO₄²⁻ > NO₃⁻ > OH⁻
In case of degraded alkali soil, there is a leaching of saline-sodic soil occurs and part of exchangeable Na is frequently replaced by (RJ AARO Agri.Chemistry 2018)
- Ca²⁺
- Mg²⁺
- H⁺
- K⁺
The soils having EC < 4 dsm⁻¹, ESP > 15 and pH more than > 8.5 the soils is (RJ AARO Agri.Chemistry 2018)
- Saline
- Alkali
- Saline alkali
- Degraded alkali
Soils having Grey brown upper crust and are hard on walking are known as (RJ AARO Agri.Chemistry 2018)
- Saline soil
- Saline alkali soil
- Sodic soils soil
- Normal soils soil
The saline and alkali soils fall in which order? (RJ AARO Agri.Chemistry 2018)
- Entisol
- Alfisol
- Molisol
- Aridisol
What is the boron concentration considered excessive for plant growth? (RJ AARO Agri.Chemistry 2018)
- > 1.5 mg/kg
- 1.5 mg/kg
- 0.25 mg/kg
- < 0.2 mg/kg
The amount of iron sulphate (FeSO4.7H2O) in tons is equivalent to 1.0 ton (one ton) of gypsum to improve soil (RJ AARO Agri.Chemistry 2018)
- ton
- ton
- ton
- ton
The nutrient index value: Area with nutrient index value is > 2.3, then (RJ AARO Agri.Chemistry 2018)
- high
- medium
- low
- low medium
Diagnosis and Recommendation Integrated System (DRIS) approach was provided by (RJ AARO Agri.Chemistry 2018)
- Mitectierlich
- Beaufils
- Liebig
- Wallace
Name the enzyme responsible for reducing nitrogen (N2) to ammonia (NH3). (RJ AARO Agri.Chemistry 2018)
- Peptase
- Urease
- Nitrogenase
- Amylase
If azolla is grown in rice field along with rice crop, then how much nitrogen is fixed by azolla in rice field? (RJ AARO Agri.Chemistry 2018)
- kgN/ha
- kgN/ha
- >50 kg/ha
- kgN/ha
Which legume crop fix highest N (kg N/ha/year)? (RJ AARO Agri.Chemistry 2018)
- Groundnut
- Cow pea
- Clover
- Alfalfa
Bacteria responsible for oxidizing NO2 → NO3 in soils (RJ AARO Agri.Chemistry 2018)
- Nitrosomonas
- Nitrobacter
- Pseudomonas
- Rhizobium
The process of conversion of organic form to inorganic form (mineral form) of nutrient element is called (RJ AARO Agri.Chemistry 2018)
- Nitrification
- Denitrification
- Mineralization
- Volatilization
The processes of reduction of NO3- to N2 or N2O mediated by micro-organism is known as (RJ AARO Agri.Chemistry 2018)
- Mineralization
- Nitrification
- Denitrification
- Volatilization
The bacteria responsible for oxidizing Fe2+ to Fe3+ (ferrous to ferric form) under acidic environment (RJ AARO Agri.Chemistry 2018)
- Pseudomonas
- Thiobacillus
- Lactobacillus
- Orthobacter
Identify the microbe that controls plant disease. (RJ AARO Agri.Chemistry 2018)
- Thiobacillus
- Lactobacillus
- Pseudomonas
- Orthobacter
Which soil particle size has the highest enzymatic activity? (RJ AARO Agri.Chemistry 2018)
- Clay 50-70 μ (Mue)
- Clay < 50 μ (Mue)
- Clay 70-90 μ
- Clay < 90 μ
What is the solubility of gypsum? (RJ AARO Agri.Chemistry 2018)
- %
- %
- %
- %
The Sulphur (S) content in pure gypsum is (RJ AARO Agri.Chemistry 2018)
- %
- %
- %
- %
Deficiency of N in plant causes yellowing of (RJ AARO Agri.Chemistry 2018)
- upper leaf
- lower leaf
- middle leaf
- whole plant
Biological Nitrogen Fixation (B.N.F.) is catalyzed by (RJ AARO Agri.Chemistry 2018)
- Copper (Cu)
- Zinc (Zn)
- Boron (B)
- Molybdenum (Mo)
Deficiency of Zn causes Khaira disease in rice fields, characterized by (RJ AARO Agri.Chemistry 2018)
- Necrotic
- Yellow coloured
- Copper brownish coloured
- Reddish coloured
Nutrient deficiency causing chlorosis and stunted growth (RJ AARO Agri.Chemistry 2018)
- Sodium (Na)
- Chlorine (Cl)
- Molybdenum (Mo)
- Nitrogen (N)
Plant nutrient essential for cell wall stability and cell membrane structure (RJ AARO Agri.Chemistry 2018)
- Nitrogen (N)
- Potassium (K)
- Zinc (Zn)
- Calcium (Ca)
Nutrient constituent of chlorophyll and chromosomes (RJ AARO Agri.Chemistry 2018)
- Nitrogen (N)
- Magnesium (Mg)
- Calcium (Ca)
- Potassium (K)
Olsen's method for phosphorus determination is used in which soil type? (RJ AARO Agri.Chemistry 2018)
- Acidic soil
- Saline soil
- Neutral and calcareous soil
- Degraded alkali soil
Type of soil covering the largest area in India (RJ AARO Agri.Chemistry 2018)
- Laterite soil
- Desert soil
- Alluvial soils
- Black cotton soils
Micro-organism (bio-fertilizer) growing at 20°C to 40°C (RJ AARO Agri.Chemistry 2018)
- Thermophile
- Mesophile
- Psychrophile
- Hyperthermophile
Composition of Biogas (RJ AARO Agri.Chemistry 2018)
- CH4, H2, O2, and CO2
- C2H4, H2, CO2, and N2
- CO2, H2, O2, and N2
- CH4, CO2, H2, and N2
Dominant Mineral in Sand, Fine Sand, and Coarse Silt Soils (RJ AARO Agri.Chemistry 2018)
- Pyroxene
- Mica
- Feldspar
- Quartz
Conversion Factor of Organic Carbon to Organic Matter (RJ AARO Agri.Chemistry 2018)
Walkley & Black Method Determines (RJ AARO Agri.Chemistry 2018)
- N2
- K2O
- O.C (Organic Carbon)
- P2O5
High amount of K₂O (Potash) in the soil indicate the presence of (RJ AARO Agri.Chemistry 2018)
- Illite
- Vermiculate
- Chlorite
- Montmorillonite
What is the normality of concentrated hydrochloric acid (AR grade) in general? (RJ AARO Agri.Chemistry 2018)
Laboratory Extraction Methods for Available Phosphorus and Potassium (RJ AARO Agri.Chemistry 2018)
- Sodium acetate and NaHCO3
- Na2CO3 and Morgan reagent
- NaHCO3 and acetic acid
- NaHCO3 and Morgan's reagent
Excesses of phosphorus in soil may cause deficiency of which micro-nutrients? (RJ AARO Agri.Chemistry 2018)
- Cu & Ni
- Fe & Zn
- Mn & B
- Ni & Cd
The alkaline potassium permanganate method (Alk. KMnO₄) for determination of available nitrogen (N) in soil was given by (RJ AARO Agri.Chemistry 2018)
- Olsen
- Bray
- Subbiah and Asija
- Subbiah and Makhija
The determination of micro-nutrients on atomic absorption spectrophotometer by DTPA was given by (RJ AARO Agri.Chemistry 2018)
- Walkley and Black
- Lindsay and Norwell
- Bray
- Olsen
The ease of replacement of Ca²⁺ from colloids by plant uptake varies in order: (RJ AARO Agri.Chemistry 2018)
- Kaolinite > Illite > Montmorillonite > Peat
- Montmorillonite > Peat > Kaolinite > Illite
- Peat > Kaolinite > Illite > Montmorillonite
- Peat > Illite > Kaolinite > Vermiculite
Calculating Exchangeable Sodium Percentage (ESP) (RJ AARO Agri.Chemistry 2018)
- %
- %
- %
- %
Sulfur Requirement from Gypsum Amendment (RJ AARO Agri.Chemistry 2018)
- T
- T
- T
- T
Carbon (C), Hydrogen (H) and Oxygen (O) constitute about in plants (RJ AARO Agri.Chemistry 2018)
- %
- %
- %
- %
The N concentration in N sufficient plant varies: (RJ AARO Agri.Chemistry 2018)
- 0.5%
- %
- 1%
- %
Nutrient Element Regulating Stomata and Nutrient Transformation (RJ AARO Agri.Chemistry 2018)
- Nitrogen (N)
- Phosphorus (P)
- Calcium (Ca)
- Potassium (K)
Sulphur-Containing Amino Acids in Mustard (RJ AARO Agri.Chemistry 2018)
- Auxines
- Cysteine, Cystine, and Phytines
- Cysteine, Cystine, and Methionine
- Cysteine, Methionine, and Auxines
If 12 k cal energy is accumulated in two pyrophosphate bond, then which molecule stores that energy? (RJ AARO Agri.Chemistry 2018)
- ADP
- ATP
- C₆H₁₂O₆
- Ketones
Mn deficiency causes (RJ AARO Agri.Chemistry 2018)
- Grey speck of oat
- Speckled yellow of sugar beet
- Marsh spot of pea
- All of these
Relationship Among Field Capacity, Wilting Point, and Available Water Capacity (RJ AARO Agri.Chemistry 2018)
- FC = AWC - PWP
- AWC = FC - PWP
- PWP = FC - AWC
- AWC = PWP - FC
Redox Potential for Iron Transformation (RJ AARO Agri.Chemistry 2018)
- to 0.15
- to 0.32
- to 0.28
- to 0.22
The nomenclature of soil typic hyper thermic ustipsment: the ustic stands for (RJ AARO Agri.Chemistry 2018)
- Temperature regime
- Textural class
- Moisture regime
- Mineral class
Heavy metals are accumulated in higher (large amount) amount when irrigated with untreated sewage (RJ AARO Agri.Chemistry 2018)
- Wheat seeds (grains)
- Barley seeds (grains)
- Mustard seeds
- Leafy vegetables
Tannery and textile industrial effluents are characterized by (RJ AARO Agri.Chemistry 2018)
- High BOD, COD
- Low BOD, COD
- Medium BOD, COD
- High COD
Hazardous Form of Chromium (RJ AARO Agri.Chemistry 2018)
- Cr²⁺
- Cr³⁺
- Cr⁶⁺
- None of these
Heavy Metals in Metal Finishing Industries Effluents (RJ AARO Agri.Chemistry 2018)
- Cr and Ni
- Zn and Fe
- Cu and Pb
- Zn and Cu
Blue baby syndrome is caused by excess presence of (RJ AARO Agri.Chemistry 2018)
- Cd
- NO₃
- Pb
- Ni
The itai-itai disease is caused by higher content of which heavy metal in rice? (RJ AARO Agri.Chemistry 2018)
- Pb
- Ni
- Cd
- Cr
Nuclear Power Plant accident took place which place in then USSR causing great hazard to agricultural soil and aquatic life (RJ AARO Agri.Chemistry 2018)
- Beijing
- Moscow
- Chernobyl
- Kiev
Greenhouse Gas Contribution (RJ AARO Agri.Chemistry 2018)
- N₂O (Nitrous Oxide)
- CO₂ (Carbon Dioxide)
- SO₂ (Sulfur Dioxide)
- NH₃ (Ammonia)
The relation between Osmotic Pressure (bar or atmosphere) and electrical conductivity for salt mixture is OP = 0.36 × EC, the EC is expressed as in MKS system (RJ AARO Agri.Chemistry 2018)
- dsm⁻¹
- mhos/cm
- µmhos/cm
- d mhos/cm
The safe limit of Residual Sodium Carbonate (R.S.C.) mcl⁻¹ for the plant growth is? (RJ AARO Agri.Chemistry 2018)
- <1.25 mcl⁻¹
- <2.5 mcl⁻¹
- <4.0 mcl⁻¹
- >4.0 mcl⁻¹
With the increase in organic matter of the given soil, the Particle Density (P.D.)? (RJ AARO Agri.Chemistry 2018)
- Does not change (No change)
- Increases
- First decreases and then increases
- Decreases
Nature of Iron and Aluminum Oxides and Hydroxides Colloids (RJ AARO Agri.Chemistry 2018)
- Slowly reversible
- Slowly irreversible
- Reversible
- Irreversible
Composition of Soil Air (RJ AARO Agri.Chemistry 2018)
- O₂-20%, N₂-80%, CO₂-0.21%, Argon-0.90%
- O₂-20%, N₂-78.6%, CO₂-0.50%, Argon-0.90%
- O₂-22%, N₂-76.8%, CO₂-1.5%, Argon-0.95%
- O₂-24%, N₂-74%, CO₂-2.0%, Argon-1.5%
Relationship Between Heat Capacity and Specific Heat (RJ AARO Agri.Chemistry 2018)
- Divided by mass
- Added by mass
- Multiplied by mass
- Subtracted by mass