Plants were once said to need sixteen essential nutrients. How many are now recognised as essential?
Correct answer B. 17
Subject / 2,686 questions
Agriculture MCQs
Page 25 of Agriculture multiple-choice questions with answers. Tap an option to check yourself.
Page 25 of 135
Which indicator is used when estimating organic matter or organic carbon in soil?
Correct answer B. Diphenylamine indicator
Which well-known soil science textbook by Nyle C. Brady is available in its 14th edition?
Correct answer C. The nature and properties of soil
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What is the term for the shape of a land surface and the relationship between its natural and man-made features?
Correct answer B. Topography
What is the approximate albedo of the earth?
Correct answer B. 30%
Which element was added as the seventeenth essential plant nutrient?
Correct answer A. Nickel
Under the Fertiliser Control Order (FCO), what is the maximum permitted nitrogen content in urea form in DAP?
Correct answer B. 2.50 %
Which organic compound is the most abundant in nature?
Correct answer C. Cellulose
Who introduced the term ‘rhizosphere’?
Correct answer B. Hiltner
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How is silicon (Si) classed as a plant nutrient?
Correct answer A. Beneficial
In which soils is zinc more available to crops?
Correct answer B. Acid soils
With continued application, which fertiliser leaves the greatest residual acidity in soil?
Correct answer A. Ammonium sulphate
What proportion of the soil volume do roots usually occupy?
Correct answer B. 1% or less of soil volume
What is the molar concentration of pure water?
Correct answer A. 55.5 mol/L
Which agents are involved in biological weathering?
Correct answer D. All of these
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Which process converts raw organic matter into humus?
Correct answer C. Humification
What is the deposition of soil materials in a lower layer of the profile called?
Correct answer D. Illuviation
What term describes a soil’s resistance to mechanical stress or manipulation at different moisture contents?
Correct answer B. Soil consistence
Water that fills the large soil pores and readily drains downward under gravity, being in excess of field capacity, is known as what?
Correct answer B. Gravitational water
As the chlorophyll content of a plant rises, what happens to the solar radiation transmitted through it?
Correct answer B. Decreases