Most weathered soil order is - हल प्रश्न

सभी विषय खंड अ: सामान्य कृषि Pedology Soil Physics Soil Chemistry Soil Fertility Soil Microbiology Statistics

Q.41

Soil Science- ICAR JRF/SRF 2024

MCQ (Single Correct) +4 −1

Solubility of Fe(III) oxides decreases in the order:

(A) . a-Fe203 (Hematite)

(B) . a-FeOOH (Ggoethite)

(C) . y-Fe203 (Maghemite

(D) . y-FeOOH (Lepidocrocite)

Choose the correct answer from the options given below:

(C), (B), (A), (D) (A), (B), (C), (D). (B), (A), (O), (C) (C), (D), (A), (B)

Q.42

Soil Science- ICAR JRF/SRF 2024

MCQ (Single Correct) +4 −1

The production of single superphosphate (SSP) involves following operations:

(A) . The powdered rock phosphate (containing 30%-38% total POs) is mixed with sulphuric acid (65%-75% H»SOa) to form a slurry.

(B) . The wet material is subjected to final curing, when some of the slow reactions reach a state of near completion and the excess water evaporates. The curing time is 2-6 weeks

(C) . Solidification of the slurry in a den (denning), where continued reactions and crystallization of monocalcium phosphate take place (time required 0.5 to 4 hours)

(D) . If granular SSP is desired, it can be granulated either before or after it is cured

Choose the correct answer from the options given below:

(A), (8) and (D) only. (A), (B) and (C) only, (A), (B), (C) and (D). (B), (C) and (D) only.

Q.43

Soil Science- ICAR JRF/SRF 2024

Assertion & Reason +4 −1

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).

Assertion (A) : Dehydrogenase activity reflects the total range of the oxidative activity of soil microorganisms and may be considered a good indicator of the oxidative metabolism in soils.

Reason (R) : Dehydrogenase oxidizes soil organic matter by transferring protons and electrons from organic substrates to inorganic acceptors.

In light of the above statements, choose the correct answer from the options given below.

Both (A) and (R) are true and (R) is the correct explanation of (A) Both (A) and (R) are true but (R) is NOT the correct explanation of (A). (A) is true but (R) is false. (A) is false but (R) is true.

Q.44

Soil Science- ICAR JRF/SRF 2024

MCQ (Single Correct) +4 −1

Most weathered soil order is

Inceptisols Vertisols Oxisols Alfisols

Q.45

Soil Science- ICAR JRF/SRF 2024

Match the Following +4 −1

Match List-I with List-II:

Choose the correct answer from the options given below:

List - I Nutrient element		List - II Enzymes
A	Copper Copper	I	Nitrogenase and nitrate reductase Nitrogenase and nitrate reductase
B	Iron Iron	II	Ascorbic acid oxidase and polyphenol oxidase Ascorbic acid oxidase and polyphenol oxidase
C	Zinc Zinc	III	Catalase and peroxidase Catalase and peroxidase
D	Molybdenum Molybdenum	IV	Carbonic anhydrase and alcohol dehydrogenase Carbonic anhydrase and alcohol dehydrogenase

(A) - (1), (B) - (Il), (C) - (Ill), (D) - (IV) (A) - (Il), (B) - (Ill), (C) - (IV), (B) - (1) (A) - (1), (B) - (M), (C) - (V), (D) - (ttl) (A) - (III), (B) - (V), (C)~ (1), (B) - (HN)