RPSC Rajasthan ARO Agricultural Chemistry 2011 Solved Paper (English) — Agri Master Mind
Relative proportions of sand, silt and clay in soil is called (RJ ARO Agri. Chemistry 2011)
- Pedon
- Soil texture
- Soil structure
- Soil complex
Which of the following is the main cause for Eutrophication? (RJ ARO Agri. Chemistry 2011)
- Nitrogen
- Phosphorus
- Sulphur
- Micro nutrients
In unsaturated soil conditions, hydraulic conductivity is a function of (RJ ARO Agri. Chemistry 2011)
- Pressure Potential
- Matric Potential
- Gravitational Potential
- Osmotic Potential
Yellow colour in a flame test shows the presence of (RJ ARO Agri. Chemistry 2011)
- Potassium
- Lithium
- Calcium
- Sodium
Total nitrogen in soil is determined by (RJ ARO Agri. Chemistry 2011)
- Alkaline permanganate method
- Olsen's method
- Kjeldahl process
- Bray's method
Which of the following is a 2:1 expanding type clay mineral? (RJ ARO Agri. Chemistry 2011)
- Illite
- Vermiculite
- Kaolinite
- Chlorite
Which organism fixes atmospheric nitrogen? (RJ ARO Agri. Chemistry 2011)
- Azotobacter
- Nitrobacter
- Nitrosomonas
- Nitrosococcus
Which law is used for studies of water flow? (RJ ARO Agri. Chemistry 2011)
- Ohm's Law
- Fick's Law
- Fourier's Law
- Darcy's Law
Which is the upper limit of soil water availability to plants? (RJ ARO Agri. Chemistry 2011)
- Field capacity
- Maximum water holding capacity
- Permanent wilting point
- Saturation point
The latent heat of vaporization (Cal/g) of water is (RJ ARO Agri. Chemistry 2011)
Which soil has the lowest quantity of available water? (RJ ARO Agri. Chemistry 2011)
- Clay
- Sand
- Clay loam
- Silty loam
Which instrumental method is used for estimation of micronutrients and heavy metals? (RJ ARO Agri. Chemistry 2011)
- Atomic absorption spectrophotometer
- Flame photometer
- Spectrophotometer
- Polarimeter
Emission intensity in flame emission spectroscopy depends upon (RJ ARO Agri. Chemistry 2011)
- Number of excited atoms
- Temperature
- Number of excited atoms & temperature
- Number of un-excited atoms
Which is the principal buffer mechanism in soil? (RJ ARO Agri. Chemistry 2011)
- Organic carbon
- Calcium carbonate
- Cation exchange capacity
- Soil structure
Water has maximum density at (RJ ARO Agri. Chemistry 2011)
- °C
- °C
- °C
- °C
The main process of concentration of free silica in soil is (RJ ARO Agri. Chemistry 2011)
- Laterization
- Podzolization
- Calcification
- Gleization
Which phenomenon is not a nuclear phenomenon? (RJ ARO Agri. Chemistry 2011)
- X-ray emission
- Alpha-particle emission
- Beta-particle emission
- Gamma emission
Dominance of which increases the thickness of the double diffuse layer? (RJ ARO Agri. Chemistry 2011)
- Monovalent cations
- Divalent cations
- Trivalent cations
- Pentavalent cations
Thermal conductivity of which type of soil is higher? (RJ ARO Agri. Chemistry 2011)
- Clayey soils
- Silty loam soils
- Sandy soils
- Clay loam soils
Which is the main source of Cadmium pollution? (RJ ARO Agri. Chemistry 2011)
- Rock phosphate
- Muriate of potash
- Dolomites
- Urea
Which micronutrient is essential for the microbial assimilation of nitrogen? (RJ ARO Agri. Chemistry 2011)
- Mo
- B
- Zn
- Cu
The most electronegative element in the periodic table is (RJ ARO Agri. Chemistry 2011)
- Chlorine
- Fluorine
- Gold
- Silver
Dielectric constant of water is (RJ ARO Agri. Chemistry 2011)
Devarda alloy is composed of (RJ ARO Agri. Chemistry 2011)
- % Cu, 45% Al and 5% Zn
- % Zn, 45% Al and 5% Cu
- % Al, 45% Cu and 5% Zn
- % Al, 45% Zn and 5% Cu
Increase in soil water content and soil temperature, increases the availability of which nutrient most? (RJ ARO Agri. Chemistry 2011)
- Nitrogen
- Phosphorus
- Potassium
- Boron
Term fabric was introduced into soil micromorphology in the year 1938 by (RJ ARO Agri. Chemistry 2011)
- G Stoops
- P Buflock
- Kubiena
- U Basel
In which cake highest nitrogen content is found? (RJ ARO Agri. Chemistry 2011)
- Neem cake
- Coconut cake
- Castor cake
- Groundnut cake
Which of the following elements is part of chlorophyll? (RJ ARO Agri. Chemistry 2011)
- Cu
- Zn
- Mg
- Mn
The negative charge on the clay surface and the swarm of positive counter ions are called as (RJ ARO Agri. Chemistry 2011)
- Electric potential
- Surface potential
- Electric double layer
- Zeta potential
The most common method for determining soluble Na and Ca ions in soil is (RJ ARO Agri. Chemistry 2011)
- Colorimetric
- Flame photometric
- Potentiometric
- Titrimetric
In the international pipette method, H₂O₂ is used to remove which of the following? (RJ ARO Agri. Chemistry 2011)
- CaCO₃
- Iron oxide
- Organic matter
- Aluminum oxide
Which horizon has maximum leaching and washing out? (RJ ARO Agri. Chemistry 2011)
- A horizon
- B horizon
- C horizon
- Regolith
The elements which ionize readily or form stable oxy-anions are (RJ ARO Agri. Chemistry 2011)
- Lithophile elements
- Chalcophile elements
- Atmosphile elements
- Biophile elements
Broken peds are called as (RJ ARO Agri. Chemistry 2011)
- Clods
- Peds
- Fragments
- Aggregates
Which type of mineral is Chlorite? (RJ ARO Agri. Chemistry 2011)
- :1 type
- :1 expanding type
- :1 type
- :1 non-expanding type
In which type of survey are cadastral maps and aerial photographs generally used as base material? (RJ ARO Agri. Chemistry 2011)
- Detailed soil survey
- Reconnaissance soils survey
- Detailed-reconnaissance soils survey
- Semi-detailed soil survey
Which law is used in studies of heat flow? (RJ ARO Agri. Chemistry 2011)
- Darcy's Law
- Fick's Law
- Fourier's Law
- Ohm's Law
Total porosity is more in (RJ ARO Agri. Chemistry 2011)
- Sandy soil
- Clayey soil
- Loamy soil
- Silty soil
Chemically most active soil separate is (RJ ARO Agri. Chemistry 2011)
- Sand
- Silt
- Clay
- Gravel
The best agricultural soil structure is (RJ ARO Agri. Chemistry 2011)
- Crumb
- Platy
- Columnar
- Blocky
bar is equal to (RJ ARO Agri. Chemistry 2011)
- kPa
- atm
- psi
- atm
The ratio of the volume of soil air to the volume of soil is called as (RJ ARO Agri. Chemistry 2011)
- Porosity
- Air-filled capacity
- Aeration porosity
- Bulk density
Which soil order stands for organic soils? (RJ ARO Agri. Chemistry 2011)
- Histosols
- Inceptiosols
- Mollisols
- Oxisols
Specific heat of organic matter is (RJ ARO Agri. Chemistry 2011)
- Cal/g
- Cal/g
- Cal/g
- Cal/g
Soil order of highly weathered soils is (RJ ARO Agri. Chemistry 2011)
- Histosols
- Inceptisols
- Mollisols
- Oxysols
The purity of the colour is represented by (RJ ARO Agri. Chemistry 2011)
- Hue
- Value
- Chroma
- None of these
Predominant clay mineral of Spodosols is (RJ ARO Agri. Chemistry 2011)
- Kaolinite
- Montmorillonite
- Illite
- Sesquioxide
The weight of one hectare furrow slice (0-15 cm depth) is (RJ ARO Agri. Chemistry 2011)
- × 10⁶ kilograms
- × 10⁶ kilograms
- × 10⁶ kilograms
- × 10⁶ kilograms
The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in the leguminous root nodule is (RJ ARO Agri. Chemistry 2011)
- Nitrogenase
- Nitrate reductase
- Nitrite reductase
- Carbonic anhydrase
Which fertilizer contains nutrients other than primary nutrients? (RJ ARO Agri. Chemistry 2011)
- Urea
- Diammonium Phosphate
- Ammonium Sulphate
- Ammonium Nitrate
Which of the following forms of phosphorus is more available to plants? (RJ ARO Agri. Chemistry 2011)
- H3PO4
- H2PO4-
- PO4^3-
- None of these
Which of the following is not an essential nutrient for plant growth? (RJ ARO Agri. Chemistry 2011)
- B
- Al
- Cl
- Mo
Which is an important oxidizing agent used as a standard solution? (RJ ARO Agri. Chemistry 2011)
- Oxalic acid
- Potassium dichromate
- Ferrous sulfate
- Sodium thiosulphate
Formula for quick lime is (RJ ARO Agri. Chemistry 2011)
- CaCO3
- Ca(OH)2
- CaO
- CaCO3.MgCO3
Process of mixing of soil is known as (RJ ARO Agri. Chemistry 2011)
- Pedoturbation
- Podzolization
- Laterization
- Calcification
The permissible maximum biuret content of urea in India is (RJ ARO Agri. Chemistry 2011)
- %
- %
- %
- %
Most easily weatherable mineral in soil is (RJ ARO Agri. Chemistry 2011)
- Olivine
- Hornblende
- Biotite
- Quartz
The thermal conductivity... (RJ ARO Agri. Chemistry 2011)
- The thermal conductivity appears as a proportionality coefficient in Fick's equation.
- The thermal conductivity decreases with soil compaction.
- The thermal conductivity increases with a reduction in particle size.
- The thermal conductivity increases with the increase in soil moisture content of dry soil.
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- Nitrifying organisms are particularly sensitive to aeration
- Nitrite is oftenly found accumulated in soils.
- The autotrophs have a less efficient nitrifying system than most of the heterotrophs
- Conversion of ammonia to nitrate is a reductive process
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- A single cation on a given clay mineral can only be held with a fixed bonding energy.
- A given clay has fixed bonding energy for different cations.
- Different clays have widely different bonding energies for a given cation.
- The complimentary ion has no effects on bonding energies.
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- Excess copper may enhance the utilization of molybdenum.
- Excess potassium enhances manganese uptake.
- Heavy nitrogen fertilization intensifies copper deficiency.
- Excess of zinc, manganese and copper reduces the iron deficiency.
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- Sulphur deficiency symptoms resemble those of phosphorus deficiency.
- Growing tips often are damaged by zinc deficiency.
- Magnesium is generally considered to be an immobile element in plants.
- Boron is not readily translocated from older leaves to meristematic tissues.
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- Illite clay particles are smaller than montmorillonite particles.
- Internal surface of kaolinite clay is negatively charged.
- Cation exchange capacity of vermiculite is 2-15 C.mol/kg.
- Chlorites are silicates of magnesium.
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- In triple superphosphate, 46-48 percent phosphorus is as monocalcium phosphate or water-soluble phosphate.
- In alkaline soils, iron and aluminium are present in appreciable quantity.
- From rock phosphate, availability of phosphorus is more in alkaline reaction soils.
- Ammonium ion-containing fertilizers are difficult to dissolve in water.
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- At low temperature, both growth and decomposition rate of the plant is more.
- Finer the soil texture, the lesser will be the carbon content.
- Soils ploughed repeatedly contain less carbon content.
- Loss of soil carbon occurs in legume-containing crop rotation.
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- Zinc is a constituent of chlorophyll.
- Potassium increases disease resistance in plants.
- Copper deficiency hinders cell division in plants.
- Chlorosis between the veins is a major symptom of boron deficiency.
Which of the following statements is correct? <br> a) When fresh plant residues are added to soil, they contain more nitrogen as compared to carbon. <br> b) Soil organic material contains the maximum percentage of lignin and
- When fresh plant residues are added to soil, they contain more nitrogen as compared to carbon
- Soil organic material contains the maximum percentage of lignin and protein.
- In organic matter dispersion, the effect of calcium is more than sodium
- Under alkali soil situation, the problem is due to salt accumulation
Which of the following statements is correct? <br> (1) In soil weight determination, particle density is helpful. <br> (2) To understand the physical behavior of soil, particle density is more important than bu
- In soil weight determination, particle density is helpful
- To understand the physical behavior of soil, particle density is more important than bulk density
- Specific gravity and particle density of soil are mostly the same.
- Soil property does not change easily
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- In soils both H₂PO₄⁻ and HPO₄²⁻ ions exist at pH 3.0
- Plants absorb phosphorus largely in the form of metaphosphate ion
- The concentration of various phosphate ions in soil solution is intimately related to pH.
- In alkaline soils the product of phosphate fixation are largely complex phosphates of iron and aluminium
Which of the following statements is correct? (RJ ARO Agri. Chemistry 2011)
- Both ammonium nitrogen and nitrate nitrogen can be immobilized by soil microflora.
- Once ammonia is nitrified, it is lost as volatilization.
- The mechanism of ammonium fixation is similar to that of phosphorus fixation.
- Ammonium fixation is increased by raising the levels of soil phosphorus.
Which of the following are nitrification inhibitors? (RJ ARO Agri. Chemistry 2011)
- Potassium azide
- Dicyandiamide
- Acetohydroxamaté
- Thiocarbamate
What are the fates of nitrates in the soil? (RJ ARO Agri. Chemistry 2011)
- Leaching
- Denitrification
- Nitrification
- Plant uptake