Unit 3 - Practice Quiz

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

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

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

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

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

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

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

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

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

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

11 The Cate-Nelson graphical method is used for?

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

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

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

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

16 The concept of 'Hidden Hunger' refers to:

17 What does DRIS stand for in plant analysis?

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

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

20 Indicator plant for Molybdenum deficiency is:

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

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

23 The Steenberg effect in plant analysis is related to:

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

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

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

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

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

29 Indicator plant for Calcium deficiency?

30 Indicator plant for Sodium toxicity/salinity?

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

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

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

34 Which form of Iron is taken up by plants?

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

36 Rapid tissue tests (sap tests) are generally:

37 Potato is often used as an indicator plant for:

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

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

40 The form of Boron uptake by plants is mainly:

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

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

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

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

45 Sorghum is a sensitive indicator plant for:

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

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

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

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

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