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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-9 section-2

Each section contains 100 MCQs on Soil Science .
81
Fertiliser P reacts in soil to form compounds with
Discuss
Answer & Solution
Answer: Option C
Solution:
Fertilizer P reacts in the soil to form compounds with Aluminium, Iron and Calcium. It forms water soluble phosphate ions and compounds reacting with these elements which can be readily absorbed by the plants for its use.
Phosphorous is one of the essential nutrients of the plants and it shares a major portion in all widely used fertilizers like NPK, DAP, MAP, TSP, etc.
82
Fibrous clay is
Discuss
Answer & Solution
Answer: Option D
Solution:
Attapulgite also known as palygorskite is a fibrous clay with a chemical composition of magnesium aluminum phyllosilicate. It is one of the types of fuller's earth.
Attapulgite is widely used in medicines. It binds to acids and toxic substances in the stomach and digestive tracts when taken orally.
83
In DTA (Differential Thermal Analysis), which are used as inert material?
Discuss
Answer & Solution
Answer: Option D
Solution:
DTA is Differential thermal analysis and is a thermoanalytical technique similar to differential scanning calorimetry. It consists of an inert environment with inert gases which will not react with sample and reference. Al2O3, Silica and Charcoal, all are used as inert materials.
84
Match the following columns:
Column I (OM) Column II (N Content %)
a. Compost 1. 0.50
b. FYM 2. 0.89
c. Night soil 3. 5.50
d. Bird guano 4. 7-8
Discuss
Answer & Solution
Answer: Option C
Solution:
The compost contains 0.89% of nitrogen.

FYM is farmyard manure and its nitrogen content is 0.50%.

Night soil is nothing but human excreta which is used as fertilizer and it contains 5.5% of nitrogen approximately.

Bird Guano is the accumulated excrement of seabirds and bats, and is a highly effective fertilizer, it contains 7% - 8% of Nitrogen.
85
The phosphorus in plant seeds is mainly
Discuss
Answer & Solution
Answer: Option B
Solution:
The phosphorus in plant seeds is mainly in the form of Phytin.
Phytin is a calcium magnesium salt of phytic acid that occurs in plants as the main phosphorus storage reserve, especially in seeds or tubers and is used as a source of inositol.
86
A soil can be considered as Organic soil if it contains . . . . . . . . % organic matter.
Discuss
Answer & Solution
Answer: Option D
Solution:
Soil can be considered Organic soil if it contains 20% organic matter.
Soil organic matter provides numerous benefits to the physical and chemical properties of soil and its capacity to provide regulatory ecosystem services. It acts as a major sink and source of soil carbon (C).
87
CEC of vermiculite is
Discuss
Answer & Solution
Answer: Option D
Solution:
Vermiculite is a hydrous phyllosilicate material that undergoes significant expansion when heated.
Vermiculite is a 2 : 1 neutral clay, which means it has two tetrahedral sheets for every octahedral sheet. Vermiculite has a high cation-exchange capacity (CEC) at 100 - 200 Cmolc (P+)/Kg.
88
Optimum dose should not be exceeded because it means
Discuss
Answer & Solution
Answer: Option A
Solution:
The optimum dose is the minimum amount of any substance required to be given to any organism, whether it is a plant or animal or human to fulfill the nutritional requirement or to cure any illness.
The optimum dose should not be exceeded because it means a cut in net profits.
89
Charge of brucite layer is
Discuss
Answer & Solution
Answer: Option A
Solution:
Brucite is the mineral form of magnesium hydroxide. It is a common alteration product of periclase in marble, low-temperature hydrothermal vein mineral in metamorphosed limestones and chlorite schists.
Brucite is a double hydroxide layer and is positively charged.
90
Sulphur content (%) in potassium sulphate is
Discuss
Answer & Solution
Answer: Option A
Solution:
Potassium sulphate is an inorganic compound, water soluble solid, commonly used as fertilizer providing both potassium and Sulphur.
It contains 17% of Sulphur approximately, which is required by plants for the growth process and also to adjust the pH level of the soil or hydroponic systems.