1 $Which soil sampling method is most commonly recommended to obtain a representative sample from a uniform field?$

A.

Grid sampling

B.

Zig-zag method

C.

Random sampling without pattern

D.

Linear transect

2 $What is the standard depth for soil sampling in field crops (cereals, pulses, oilseeds)?$

A.

0 - 5 cm

B.

0 - 15 cm

C.

15 - 30 cm

D.

30 - 60 cm

3 $Which extractant is most suitable for determining available Phosphorus in acidic soils?$

A.

Olsen's Reagent ()

B.

Bray No. 1 ()

C.

Ammonium Acetate ()

D.

DTPA

4 $Which extractant is used for determining available Phosphorus in neutral to alkaline soils?$

A.

Bray No. 1

B.

Olsen's Reagent

C.

Mehlich 1

D.

Morgan's Reagent

5 $Which method is standard for the determination of Soil Organic Carbon?$

A.

Kjeldahl method

B.

Walkley and Black method

C.

Flame Photometry

D.

Atomic Absorption Spectroscopy

6 $What is the commonly accepted critical level of DTPA-extractable Zinc () in soil?$

A.

0.1 ppm

B.

0.6 ppm

C.

1.2 ppm

D.

2.5 ppm

7 $In the Alkaline Permanganate method for available Nitrogen, which fraction of soil Nitrogen is primarily estimated?$

A.

Total Nitrogen

B.

Nitrate Nitrogen only

C.

Easily mineralizable Nitrogen

D.

Fixed Ammonium

8 $Neutral Ammonium Acetate () is the standard extractant for which nutrient?$

A.

Available Phosphorus

B.

Exchangeable Potassium

C.

Available Sulphur

D.

Available Boron

9 $Which ionic form of Phosphorus is most predominant for plant uptake at a soil pH of 6.0 to 7.0?$

A.

B.

C.

D.

10 $What does the 'Critical Level' of a nutrient in soil signify?$

A.

The level at which the plant dies.

B.

The level above which crop response to added nutrient is unlikely.

C.

The total amount of nutrient in the soil.

D.

The level where toxicity begins.

11 $The Cate-Nelson graphical method is used for?$

A.

Determining soil texture

B.

Partitioning soils into responsive and non-responsive classes (Critical levels)

C.

Measuring cation exchange capacity

D.

Calculating fertilizer requirement

12 $Which plant is considered an indicator plant for Zinc deficiency?$

A.

Sunflower

B.

Maize (Corn)

C.

Cauliflower

D.

Sugarbeet

13 $Sunflower is a classic indicator plant for which nutrient deficiency?$

A.

Nitrogen

B.

Phosphorus

C.

Boron

D.

Molybdenum

14 $Which reagent is used to extract available Sulphur from soil?$

A.

(Morgan's reagent)

B.

Hot water

C.

DTPA

D.

Ammonium Fluoride

15 $What is the primary form of Nitrogen absorbed by plants in upland (aerated) soil conditions?$

A.

B.

C.

D.

Organic N

16 $The concept of 'Hidden Hunger' refers to:$

A.

Deficiency symptoms are visible but yield is not reduced

B.

Nutrient levels are low enough to reduce yield/growth, but no deficiency symptoms are visible

C.

Excess nutrient accumulation leading to toxicity

D.

Plants appearing hungry due to water stress

17 $What does DRIS stand for in plant analysis?$

A.

Direct Root Injection System

B.

Diagnosis and Recommendation Integrated System

C.

Daily Rate of Intake Standards

D.

Digital Rationing of Irrigation Systems

18 $Which part of the plant is typically sampled for tissue analysis in Corn at silking stage?$

A.

Whole plant

B.

Ear leaf (leaf opposite and below the ear)

C.

Lower most leaf

D.

Tassel

19 $Which chemical is commonly used in rapid plant tissue tests to detect Nitrate-Nitrogen?$

A.

Diphenylamine

B.

Phenolphthalein

C.

Silver Nitrate

D.

Barium Chloride

20 $Indicator plant for Molybdenum deficiency is:$

A.

Wheat

B.

Rice

C.

Cauliflower

D.

Cotton

21 $Hot water extraction is the standard method for determining available:$

A.

Iron

B.

Boron

C.

Manganese

D.

Copper

22 $Which of the following elements is absorbed by plants as a cation?$

A.

Chlorine ()

B.

Boron ()

C.

Potassium ()

D.

Phosphorus ()

23 $The Steenberg effect in plant analysis is related to:$

A.

Synergism between N and P

B.

Dilution effect

C.

Yield reduction due to toxicity

D.

Concentration of nutrient increases under extreme deficiency due to stunted growth

24 $What is the general critical range for Soil Organic Carbon (SOC) for Indian soils to be considered 'Medium'?$

A.

B.

C.

D.

25 $Which instrument is primarily used to estimate Potassium in soil extracts?$

A.

Spectrophotometer

B.

Flame Photometer

C.

Conductivity Bridge

D.

pH Meter

26 $What is the critical limit for Available Phosphorus (kg/ha) using Olsen's method to classify soil as 'Low'?$

A.

kg/ha

B.

kg/ha

C.

kg/ha

D.

kg/ha

27 $DTPA (Diethylenetriaminepentaacetic acid) is a chelating agent used to extract:$

A.

N, P, K

B.

Ca, Mg, S

C.

Zn, Fe, Mn, Cu

D.

C, H, O

28 $Which plant part is best for analyzing nutrient status in Wheat at tillering stage?$

A.

Roots

B.

Grain

C.

Whole shoot (above ground)

D.

Flag leaf

29 $Indicator plant for Calcium deficiency?$

A.

Cauliflower

B.

Potato

C.

Sorghum

D.

Oats

30 $Indicator plant for Sodium toxicity/salinity?$

A.

Sugarbeet

B.

Beans

C.

Citrus

D.

Rice

31 $Visual symptoms of deficiency for mobile nutrients (like N, P, K) typically appear first on:$

A.

Young leaves (top)

B.

Old leaves (bottom)

C.

Roots

D.

Stems only

32 $Visual symptoms of deficiency for immobile nutrients (like Ca, B, Fe) typically appear first on:$

A.

Young leaves (top)

B.

Old leaves (bottom)

C.

Roots

D.

Middle leaves

33 $Electrical Conductivity (EC) of a soil saturation extract is a measure of:$

A.

Soil Acidity

B.

Total Soluble Salts (Salinity)

C.

Organic Matter

D.

Soil Texture

34 $Which form of Iron is taken up by plants?$

A.

(Ferrous)

B.

(Ferric)

C.

D.

Metallic Iron

35 $The 'Law of Minimum', which is fundamental to soil fertility evaluation, was proposed by:$

A.

Justus von Liebig

B.

Mitscherlich

C.

Bray

D.

Sorensen

36 $Rapid tissue tests (sap tests) are generally:$

A.

Quantitative and highly accurate

B.

Qualitative or semi-quantitative

C.

Used for calculating exact fertilizer doses

D.

More expensive than laboratory analysis

37 $Potato is often used as an indicator plant for:$

A.

Potassium

B.

Nitrogen

C.

Zinc

D.

Iron

38 $In the interpretation of Soil Test values, a 'Nutrient Index' value of < 1.67 indicates:$

A.

High fertility

B.

Medium fertility

C.

Low fertility

D.

Toxic levels

39 $Which nutrient becomes less available as soil pH increases above 7.0?$

A.

Molybdenum

B.

Calcium

C.

Magnesium

D.

Iron

40 $The form of Boron uptake by plants is mainly:$

A.

B.

(Boric Acid)

C.

D.

41 $Standard critical limit for available Nitrogen (Alkaline KMnO4 method) to be classified as 'Low' is:$

A.

kg/ha

B.

kg/ha

C.

kg/ha

D.

kg/ha

42 $The color developed in the determination of Phosphorus by the Ascorbic Acid method is:$

A.

Yellow

B.

Red

C.

Blue

D.

Green

43 $White Bud in Maize is caused by the deficiency of:$

A.

Zinc

B.

Iron

C.

Magnesium

D.

Calcium

44 $Which of the following is an example of biological soil testing?$

A.

Walkley-Black Method

B.

Neubauer Seedling Method

C.

Flame Photometry

D.

Neutron Probe

45 $Sorghum is a sensitive indicator plant for:$

A.

Iron deficiency

B.

Phosphorus deficiency

C.

Potassium deficiency

D.

Boron deficiency

46 $What is the primary reservoir (form) of soil Nitrogen?$

A.

Inorganic Ammonium

B.

Inorganic Nitrate

C.

Organic Nitrogen

D.

Dissolved Gas

47 $The Soil Health Card (SHC) in India typically reports how many parameters?$

A.

5

B.

8

C.

12

D.

20

48 $Interveinal chlorosis in young leaves is a typical symptom of:$

A.

Nitrogen deficiency

B.

Iron deficiency

C.

Potassium deficiency

D.

Phosphorus deficiency

49 $Which equation is used to calculate the Fertilizer Dose based on Soil Test Crop Response (STCR)?$

A.

Mitscherlich equation

B.

Target Yield Equation

C.

Langmuir equation

D.

Freundlich equation

50 $Generally, for plant analysis, the samples should be washed to remove:$

A.

Surface contamination (dust/sprays)

B.

Epidermal cells

C.

Chlorophyll

D.

Internal moisture

Unit 3 - Practice Quiz