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Soil Science MCQ Question and Answer | Agriculture MCQ Question

Soil Science MCQ Question and Answer with easy explanations in Agriculture mcq. Soil Science MCQ section is suitable for aspirants preparing for IBPS- AFO (Agriculture Field Officer) Iffco, Kribhco, NFL, NSC, ICAR-JRF/SRF/ ARS, IARI, SADO, DDA,ADA,FCI,ASRB,B.Sc Agriculture and M.SC Agriculture. Page-3 section-2

Each section contains 100 MCQs on Soil Science .
21
In 1843, Agricultural Experiment Station at Rothamsted, England was started by
Discuss
Answer & Solution
Answer: Option C
Solution:
In 1843, Agricultural Experimental Station at Rothamsted, England was started by Sir John Bennet Lawes and Sir Joseph Henry Gilbert.
It is one of the oldest agricultural research institutions in the world, located at Harpenden in the English countryside and is a registered charity under English Law.
22
Which of the following nutrients is available at neutral pH value?
Discuss
Answer & Solution
Answer: Option D
Solution:
Phosphorus is the nutrient available at a neutral pH value. Soils with pH values between 6 and 7.5 are ideal for phosphorus availability, while pH values below 5.5 and between 7.5 and 8.5 limits phosphorus availability to plants due to fixation by aluminium, iron or calcium.
23
One atmosphere means
Discuss
Answer & Solution
Answer: Option C
Solution:
An atmosphere is a unit of measurement of air pressure. it is approximately equal to Earth’s average atmospheric pressure at sea level. Its symbol is atm.
It is a unit of pressure defined as 101.325 Pa.
1 atmosphere = 0.5 bar
24
ATP consumption (photosynthesis) & production (respiration) are which kind of reaction respectively?
Discuss
Answer & Solution
Answer: Option A
Solution:
Photosynthesis is the process of ATP consumption to prepare food by plants and that is an Endothermic process that shows energy is utilized to work.
On the other hand Production of ATP is done by the Respiration process and it is an exothermic process in which energy is released.
25
Biogas contain . . . . . . . . % of N.
Discuss
Answer & Solution
Answer: Option D
Solution:
Biogas is a mixture of gases, consisting of methane, carbon dioxide and hydrogen sulphide. The raw materials used for the formation of this gas are agricultural waste, manure, municipal waste, plant material, sewage, green waste and food waste.
Biogas is a renewable source of energy and it contains 4 - 5% of Nitrogen.
26
C-axis spacing of illite is
Discuss
Answer & Solution
Answer: Option B
Solution:
IIIite is a group of closely related non-expanding clay minerals. It is a secondary mineral precipitate and its structure is a 2 : 1 sandwich of silica tetrahedron-alumina octahedron-silica tetrahedron layers. C-axis spacing of illite is $${\bf{100 \,nm \,or\, 10}}\mathop {\bf{\,A}}\limits^{\bf{O}} {\bf{.}}$$

Soil Science mcq solution image
27
. . . . . . . . toxicity is probably the important growth limiting factor in acid soils, particularly when pH < 5.0 to 5.5
Discuss
Answer & Solution
Answer: Option C
Solution:
Aluminium toxicity is probably the important growth limiting factor in acid soils, particularly when pH is less than 5 to 5.5.
Strongly acidic soils have high concentrations of soluble aluminium. Iron and manganese may be toxic to the growth of some plants. Soil acidity ultimately limits crop production.
28
Passive factor of soil formation includes
Discuss
Answer & Solution
Answer: Option C
Solution:
The two main factors responsible for the formation of soil are active and passive. The active factors are climate and organisms whereas the parent material, topography and time are the passive factors.
Parent material is the underlying geological material in which the horizons of soil are formed.
29
Indicator plant for monitoring K-deficiency is
Discuss
Answer & Solution
Answer: Option C
Solution:
Potassium is a very important element and plays a vital role in the growth and development of plants. However, the deficiency of potassium leads to wilt on dry, sunny days and deficient plants will have a stocky appearance with short internodes.
Some indicator plants indicate the deficiency of certain nutrients like potato, banana and cotton are indicator plants for monitoring K-deficiency.
30
Which one of the following occupies the highest volume percent in a fine sandy loam surface soil in good condition for plant growth?
Discuss
Answer & Solution
Answer: Option B
Solution:
Pore space which includes air or water occupies the highest volume percent in a fine sandy loam surface soil in good condition for plant growth.
Pore space in the soil makes it more porous and good in texture, allowing roots to respire in the soil.