Soil Science most important questions for competitive exams – Part 3

Soil Science most important questions for competitive exams – Part 3

  1. Permafrost is a layer where soil temperature is always

(a) ≤0°C

(b) 0°C

(c) 0 to 100°C

(d) ≤ 10 °C

  1. Which soil order have highest area in India ?

(a) Entisols

(b) Inceptisols

(c) Vertisols

(d) Alfisols

  1. In India, which soil order have negligible area ?

(a) Oxisols

(b) Ustisols

(c) Mollisols

(d) Histosols

  1. Which mineral substance placed at number 10 in Mho’s scale ?

(a) Talc

(b) Gypsum

(c) Carborundum

(d) Diamond

  1. Which rock is volcanic (extrusive) in native ?

(a) Gabbro

(b) Diorite

(c) Basalt

(d) Monzonite

  1. When organic matter is > 1.5% in soil, rated as

(a) Low

(b) Medium

(c) High

(d) Very high

  1. A soil profile having two sola, one above the other is known as

(a) Bisequem profile

(b) Truncated profile

(c) Soil monolith

(d) Soil fabric

  1. Chernozem soils are found in

(a) India

(b) USA

(c) Russia

(d) Brazil

  1. Which of, the following mineral is non expanding 2:1 type mineral?

(a) Montmorillonite

(b) Beidellite

(c) Nontronite

(d) Illite

  1. Which index proved to be useful to assess the dominating type of mineral in soil proposed by Martin and clay Russell ?

(a) Y-index

(b) A-value

(c) CYI

(d) E-value

  1. Humus forming fungi includes which genera

(a) Trichoderma

(b) Alternaria

(c) Aspergillus

(d) Both (b) and (c)

  1. Red sols are mainly confined to

(a) Uttar Pradesh

(b) Rajasthan

(c) Tamil Nadu

(d) Bihar

  1. Thermal conductivity follows the

(a) Sand > loam > clay > peat order

(b) Sand > peat > loam > clay

(c) Loam > sand > peat > clay

(d) Peat > sand > loam > clay 227.

14.”Law of restitution” was proposed by

(a) Olsen

(b) Das

(c) Liebig

(d) Bray

  1. Nutrient index between 1.5 and 2.5 is categorized as

(a) Low

(b) Medium

(c) High

(d) None of these

  1. The coordinated project on long term fertilizer experiment was sponsored by ICAR in

(a) 1970-71

(b) 1975-76

(c) 1980-81

(d) 1985-86

  1. Total number of master horizons present in soil are

(a) 4

(b) 5

(c) 6

(d) 7

  1. The B horizon is generally absent in 2

(a) Black soils

(b) Red soils

(c) Desert soils

(d) Brown hill soils

  1. Most salt tolerant grass is

(a) Karnal grass (Diplachne fusca)

(b) Rhodes grass (Chloris gayana)

(c) grass (Brachiaria mutica)

(d) Bermuda grass (Cynodon dactylon)

  1. Apparent nutrient recovery (ANR) can be calculated by using of which formula

(a) ANR = Nutrient removed from fertilized plot Nutrient removed from unfertilized plot/Nutrient added × 100

(b) ANR = Nutrient removed from unfertilized plot – Nutrient removed from fertilized plot/Nutrient added × 100

(c) ANR = Nutrient removed from unfertilized plot – Nutrient removed from fertilized plot/ Nutrient removed from unfertilized plot × 100

(d) None of these

  1. Oldest surviving long term manurial trial in India is located at 1909 initiated in

(a) Kanpur

(b) Coimbatore

(c) Bijapur

(d) Pusa, Bihar

  1. Biosuper is a fertilizer containing

(a) Kock phosphate + elemental sulphur

  • S. oxidizing bacteria
    (b) Phosphoric acid + elemental sulphur
  • S. oxidizing bacteria

(c) Ammonium sulphate + elemental

sulphur + S. oxidizing bacteria

(d) None of these

  1. Fertilizer control order issued in

(a) 1947

(b) 1957

(c) 1977

(d) 1986

  1. Gapon’s equation is widely used equation to describe

(a) P status of soils

(b) CEC of soils

(c) Organic matter of soils

(d) Water status of soils

  1. Who established the essentiality of Fe for plant in 1844 ?

(a) Gilbert

(b) Glauber

(c) Gris

(d) Grigg

  1. Major deposits of gypsum are found in

(a) Rajasthan

(b) Haryana

(c) Gujarat

(d) Punjab

  1. Which formula is applied to calculate
    gypsum requirement (meq/100 gm) ?

(a) GR= ESP – ESP (final) (initial)/100 xCEC

(b) GR = ESP (initial) – ESP (final) /CEC 100

(c) GR = ESP, CEC

(d) GR= ESP (initial) – ESP (final) /100 × al) – ESP (final) / AEC × (initial)

  1. Who developed the DTPA tests for available soil micronutrients ?

(a) Kurtz LT

(b) Lindsay WL

(c) Larsen

(d) Jackson ML

  1. The value of Von Bemmelen factor is

(a) 0.430

(c) 2.290

(b) 1.200

(d) 1.724

  1. Stem nodulating Rhizobium spp. is

(a) Sino-rhizobium

(b) Bradyrhizobium

(c) Azo-rhizobium

(d) All of these

  1. One ha cm of water is equal to

(a) 100 tonnes water

(b) 100000 litres water

(c) Both (a) and (b)

(d) 10 tonnes water 245.

  1. Who is considered as father of soil testing?

(a) Colwell

(b) Troug

(c) Parker

(d) Puri

  1. Journal ‘Plant and Soil’ is published from

(a) New Delhi

(b) The Netherlands

(c) Japan

(d) USA

  1. The relative proportion of sand, silt and clay in a soil is known

(a) Soil texture

(b) Soil structure

(c) Soil taxonomy

(d) Soil aggregation

  1. 1 bar is equal to

(a) 0.9869 atm

(b) Weight of a 1020 cm water column

(c) 75.01 cm high mercury column

(d) All of these

  1. The tension of the water at the upper plastic limit is equivalent to pF value

(a) 0.5

(b) 1.0

(c) 2.0

(d) 2.8 – 3.3

  1. Sources of negative charges on silicate clays is/are

(a) Exposed crystal edges

(b) Isomorphus substitution

(c) Anion exchange

(d) All of these

  1. Browning disease of rice is a

(a) Physiological disease

(b) Fungal disease

(c) Bacterial disease

(d) Viral disease

  1. Walkley and Black’s method of organic matter determination allows ……. percent recovery

(a) 54

(b) 64

(c) 74

(d) 84

  1. Soil order characterized by excess of weathering with dominant iron and aluminium oxide clays, common in tropics is

(a) Entisols

(b) Mollisols

(c) Alfisols

(d) Oxisols

  1. Which of the following nutrients is lost in the greatest amount by allowing exposure of manure pile to rain?

(a) N

(b) P

(c) K

(d) Ca

  1. Water stable aggregates in soil increase by addition of

(a) N-fertilizers

(b) P-fertilizers

(c) K-fertilizers

(d) Micronutrients

  1. A soil which has pH < 8.5, ESP < 15 and EC > 4 dSm¹ at 25°C is called

(a) Saline soil

(b) Alkaline soil

(c) Saline – alkaline soil

(d) None of these

  1. Fertility gradient approach was given by

(a) BV Mehta

(b) B. Ramamoorthy

(c) AB Ghosh

(d) B Murthy

  1. Which of the following crops is most tolerant to salty soils?

(a) Cotton

(c) Rice

(b) Corn

(d) Carrot

  1. Hydrogen bonding takes place in the interlayer of

(a) Kaolinite

(c) Mica

(b) Montmorillonite

(d) Chlorite

  1. Ionic potential is maximum in case of

(a) Na

(b) Cs

(d) Li

(c) K

  1. Ligand adsorption of weak acid anion is maximum at a pH which is

(a) Equal to pK of weak acid

(b) Greater than 10 times of pK

(c) Less than 10 times of pK

(d) Independent of pK

  1. Which one of the following will perform very poor as a source of N fertilizer under waterlogged rice field?

(a) Ammonium nitrate

(b) Urea

(c) Ammonium chloride

(d) Ammonium sulphate

  1. Which one of the following is commonly used as urease inhibitor?

(a) Dicyandiamide

(b) Thiourea

(c) Urea formaladehyde

(d) Phenol phosphorodiamidate

  1. Indian agriculture is operating at a negative balance of plant nutrients

(a) 25 mt

(b) 8-10 mt

(c) 10-15 mt

(d) 20-25 mt of

  1. Which country has largest deposits K ?

(b) Canada

(a) India

(c) U.S.A.

(d) China

  1. Which country have monopoly in P deposits ?

(a) Morocco

(b) South Africa

(c) Russia

(d) Pakistan

  1. In India, which fertilizer manufactured first ?

(a) Urea

(c) SSP

(b) DAP

(d) ASN

  1. Hartig nets in soil produce by

(a) Rhizobium

(b) Ectomycorrhiza

(c) Endomycorrhiza

(d) None

  1. End product of Dinitrification process is

(a) N₂

(b) NO3

(c) N2O and N₂

(d) NH,

  1. Which nitrogenous fertilizer industrially made first ?

(a) CaCN2

(b) Ammonium Sulphate

(c) NaNO3

(d) Urea

  1. Which crop is more tolerant to salinity?

(a) Sunflower

(b) Barley

(c) Cowpea

(d) Groundnut

  1. India is divided into how many ecological zones ?

(a) 5

(c) 15

(b) 10

(d) 20

  1. Bench terraces are constructed for the areas having land slope above:

(a) 10%

(b) 15%

(c) 20% 276.
(d) 25%

  1. Plant nutrients which show deficiency symptoms on older leaves, the correct sequence is :

(a) N, P, Mg, Zn (b) Ca, Mn

(c) Ca, S, Cu (d) Boron, Iron

  1. Available phosphorus of more than 25 kg/ha of soil is considered as :

(a) Low

(b) Medium

(c) High

(d) Trace

  1. White irregular spots between veins of upper leaves of maize plant shows the deficiency of:

(a) Copper

(b) Molybdenum

(c) Manganese

(d) Boron

  1. Average annual loss of nutrients due to erosion is

(a) 2.4 million tonnes

(b) 4.4 million tonnes

(c) 8.4 million tonnes

(d) 6.4 million tonnes

65 The amount of nitrogen fixed by soybean in Kg Nha-¹year-1 is in which range. ?

(a) 49 130

(c) 15 – 30

(b) 35 – 80

(d) < 15

  1. The volume wetness of soil can be derived from which one of the following?

(a) Mass wetness and bulk density

(b) Bulk density and particle density

(c) Hydraulic conductivity maximum WHC

(d) Particle density and intrinsic permeability

  1. A soil sample indicating pH = 7.5, EC. = 4-8 ds/m, exchangeable sodium percentage = 12, may be categorised as which one of the following?

(a) Alkaline soil

(b) Saline soil

(c) Saline-alkaline soil

(d) Normal fertile soil

  1. Consider the following statements: 1. Diffusion is the dominant mechanism for transporting soil Zn2+ to plant roots. Zinc solubility in soil solution decreases 100 fold for each unit 2. increase in pH: Which of the statements given above is/are correct?

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

  1. What is the fraction of soil organic matter which is soluble both in alkali and acid?

(a) Humic acid

(b) Fulvic acid

(c) Hymatomelonic acid

(d) Humin acid

  1. In terms of the order from youngest to the oldest soil, which one of the following is the correct chronological sequence ?

(a) Oxisol – inceptisol – alfisol – entisol

(b) Entisol inceptisol – alfisol – oxisol –

(c) Entisol – alfisol – inceptisol – oxisol

(d) Inceptisol – entisol – oxisol – alfisol

  1. The phosphorus bearing compounds in soils mean

(a) Phytins

(c) Both a and b

(b) ATP

(d) Proteins

  1. Which of the given below is/are facultatively anaerobic bacteria ?

(a) Azotobacter

(b) Bacillus

(c) Klesiella

(d) Both (b) and (c)

  1. Whiptail in Brassica is due to the deficiency of

(a) Calcium

(c) Manganese

(b) Molybdenum

(d) Zinc

  1. Which one of the following is the primary mineral that Occurs predominantly in igneous rocks?

(a) Micas

(b) Feldspars

(c) Quarty

(d) Pyroxenes

  1. To which one of the soil orders do black soils of India belong?

(a) Alfisol

(b) Inceptisol

(d) Oxisol

(c) Vertisol

  1. Which one of the following has the highest cation exchange capacity (weight basis) ?

(a) Kaolinite

(b) Illite

(c) Montmorillonite

  1. Which one of the following has the highest iron content (%)?

(a) Ferrous sulphate

(b) Ferrous ammonium phosphate

(c) Ferrous oxide

(d) Ferrous ammounium sulphate

  1. A sample of soil weighs 110 g and contains 75% moisture. If the volume of the soil is 75 cm³, what is the bulk density of the soil ?

(a) 1·80 g/cm³

(b) 1·52 g/cm³

(d) 1.28 g/cm³

(c) 1·47 g/cm³

  1. Which one of the following micronutrients is a constituent of the enzymes carbonic anhydrase, Alcohol dehydrogenase and RNA polymerase ?

(a) Zinc

(c) Iron

(b) Copper

(d) Chlorine

  1. For the estimation of which one of the following is “Normal Neutral” ammonium acetate solution is used ?

(a) Available sulphur in soil

(b) Available phosphorus in soil

(c) Potassium content in plant material

(d) Available potassium content in soil

  1. Among the following sources of salts in soils, which one is the primary source?

(a) Ground water

(b) Organic manures

(c) Canal irrigation

(d) Rock weathering

  1. Improper development of wheat inflorescence is due to deficiency of :

(a) Iron

(b) Zinc

(c) Phosphorus

(d) Boron

  1. On weight basis which element occupies a major part (46 46%) in earth’s crust

(a) O

(b) Si

(c) Al

(d) Fe

  1. Which one is associative N-fixing bacteria ?

(a) Rhizobium

(c) Azotobacter

(b) Azospirillum

(d) Acetobacter

85 Which one is purely a chemical process?

(a) Ammonia volatilization

(b) Denitrification

(c) N-fixation

(d) Nitrification

  1. Long term persistent herbicide is

(a) Pendimethalin

(b) 2,4-D

(c) Paraquat

(d) Glyphosate

  1. Pop pod in groundnut is mainly due to deficiency of which essential plant nutrient ?

(a) Nitrogen

(c) Zinc

(b) Sulphur

(d) Calcium

  1. The ‘Leaf colour chart’ (LCC) is used for judging the amount of nitrogen application to the standing crop of which one of the following ?

(a) Wheat

(b) Rice

(c) Maize

(d) Sorghum

  1. Which one among the following is the predominant species of cotton grown in India ?

(a) Gossypium herbaceum

(b) Gossypium hirsutum

(c) Gossypium arboreum

(d) Gossypium barbadense

  1. Which one of the following substances is used as sugarcane ripener ?

(a) Cycocel

(c) Ethephon

(b) Ethylene

(d) NAA

  1. Which one of the following micronutrients is a constituent of the enzyme carbonic anhydrase ?

(a) Zinc

(c) Iron

(b) Copper

(d) Chlorite

  1. The micronutrient which is constituent of vitamin B12 is

(a) Copper

(b) Cobalt

(c) Zinc

(d) Boron

  1. Average rainfall of the country is

(a) 590 mm

(c) 1290 mm

(b) 1190 mm

(d) 1490 mm

  1. Which of these herbicides is used to control weeds in zero tillage ?

(a) Pendimethalin

(b) Fluchloralin

(d) Alachlor

(c) Paraquat

  1. Repetitive growing of same sole the same field is known as

(a) Mono Cropping

(b) Sequential Cropping

(c) Relay Cropping

(d) Multiple Cropping

  1. The biuret percent limit of urea for foliar application is

(a) 0.25

(c) 1.25

(b) 0.75

(d) 1.75

  1. What is optimum plant population for Bt (Bacillus thuringensis) cotton?

(a) 10,000

(c) 37,000

(b) 27,000

(d) 42,000

  1. Dropsy disease in human caused by which weed?

(a) Pluchea lanceolata

(b) Argemone mexicana

(c) Digera arvensis

(d) Convolvulus arvensis

  1. Finger leaf disease in cotton is caused due to residual effect of which chemical?

(a) Chlorophyriphos

(b) Mancozeb

(c) 2,4-D

(d) N. A. A.

  1. Which one of the following is a green house gas ?

(a) Oxygen

(b) Ammonia

(c) Methane
(d) Chlorine

Related Posts

Leave a Reply

Your email address will not be published.