List of top Questions asked in ICAR AIEEA (PG)- 2024

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): For determination of total nitrogen in soil, the sample is usually digested with concentrated \(\text{H}_2\text{SO}_4\) in the presence of catalyst mixture consisting of \(\text{K}_2\text{SO}_4\) and \(\text{CuSO}_4\) in the ratio of 10:1.
Reason (R): The \(\text{K}_2\text{SO}_4\) is used to raise the boiling point of \(\text{H}_2\text{SO}_4\) that promote the oxidation of organic matter and conversion of organic N to \(\text{NH}_4^+\)-N, while the \(\text{CuSO}_4\) acts as a catalyst and hastens the breaking down of organic matter and conversion of N to \((\text{NH}_4)_2\text{SO_4\).
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The characteristics of saline-sodic soil are:

The sequence of events occuring upon application of urea in soil are:
(A). Hydrolysis
(B). Nitrification
(C). Denitrification
(D). Leaching
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The characteristics of ammonium sulphate are:
(A). Ammonium sulphate \([(\text{NH}_4)_2\text{SO_4]\) is a white crystalline and free-flowing fertilizer.
(B). It contains only 20.5% N and classified as low analysis fertilizer and also contains 23.7% S.
(C). It is the best N-fertilizer having least hygroscopicity, indicating that it has excellent physical property.
(D). It is an excellent nitrogenous fertilizer for acid soil.
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Followings are the slow release fertilizers having low water solubility that undergo chemical and/or microbial decomposition when applied to soil.
(A). Urea-formaldehyde
(B). Phenyl phosphorodiamidate (PPDA)
(C). Urea-Z
(D). Crotonylidene diurea
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The law which states that whatever is being taken by plants from soil needs to be restored to maintain the nutrient supplying capacity of the soil is known as:

Deficiency of boron (B) can be corrected by application of which of the following fertilizers?
(A). Borax
(B). Boric acid
(C). Solubor
(D). Lime
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For commercial production of DAP (Diammonium phosphate), liquid ammonia is reacted with mineral acid

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Nitrification is a two-step process which refers to the conversion of ammonium (\(\text{NH}_4^+\)) to nitrate (\(\text{NO}_3^-\)).
(A). Nitrification is a two-step process which refers to the conversion of ammonium (\(\text{NH}_4^+\)) to nitrate (\(\text{NO}_3^-\)).
(B). In the first step, Nitrosomonas (obligate autotrophic bacteria) convert ammonium (\(\text{NH}_4^+\)) to nitrite (\(\text{NO}_2^-\)).
(C). The second step of nitrification occurs through Nitrobacter and Nitrosolobus species, which convert nitrite (\(\text{NO}_2^-\)) to nitrate (\(\text{NO}_3^-\)).
(D). The second step of nitrification occurs through Nitrobacter species only, which convert nitrite (\(\text{NO}_2^-\)) to nitrate (\(\text{NO}_3^-\)).
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Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): High Na-concentration in irrigation water may reduce oxygen supply to the root system.
Reason (R): High sodium content in irrigation water causes flocculation of soil particles.

A rice crop of 5 ha area was irrigated 10 times with 5 cm water per irrigation, find out the total quantity of water applied in cubic meter.

Read the following statements:
(A). In furrow irrigation method, short, near horizontal furrows can be used on flat land with a maximum slope of 2%.
(B). On steep sloping land, contour furrows can be used upto a maximum slope of 6%.
(C). A minimum of 0.05% slope is recommended to assist drainage in a furrow system.
(D). Border irrigation can be used on sloping land upto 2% slope on a sandy soil.
(E). Border irrigation can be used on sloping land upto 3% slope on a clay soil.
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A method of irrigation in which water is applied on per plant basis

If water is available for three irrigations only, at which stages the wheat crop should be irrigated

For qualifying as an essential nutrient, element must satisfy the essentiality criteria propounded by D.I. Arnon and P.R. Stout in the year -

Read the following statements:
A). Water holding capacity of sandy soil is high as larger pores can hold more water.
B). Silty soils have medium to high water retentive capacity.
C). Clay soils have small size pores, thus have low water holding capacity.
D). Clay soil have poor aeration and poor drainage.
E). Water holding capacity of soil depends largely on its texture and organic matter present in it.
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Total depth of irrigation applied for a wheat crop of 90 days base period is 70 cm, what will be the duty of water.

Given below are two statements:
Statement (I): Capillary rise is responsible for loss of water from soil by evaporation.
Statement (II): Retention of water by soil against gravitation pull depends on two surface forces, namely, cohesion and adhesion.
In light of the above statements, choose the most appropriate answer from the options given below.

In neutron method used to measure soil moisture, the source of fast neutrons is a mixture

Match List-I with List-II

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One acre-foot water is equal to how many cubic meter water?

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Given below are two statements:
Statement (I): The Qanats, the oldest known irrigation methods, were developed in Ancient Persia
Statement (II): The system comprises a network of canals and steeply sloping tunnels driven into sides of cliffs and steep hills for harvesting of rain water.
In light of the above statements, choose the most appropriate answer from the options given below.

Correct order, in decreasing trend, of reservoirs based on their capacity at full reservoir level (Mm\(^3\))