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Challenge Details
Soil Science
Questions
15
Full Marks
15
Negative
0.25
Duration
15 min
Solutions & Explanations
16 topic group(s) · Review all correct answers
1
Which formula is used for calculation of base saturation?
A (Total exchangeable bases / CEC) × 100
B Exchangeable bases / CEC × 100
C CEC / Total bases × 100
D CEC / Exchangeable bases × 100
E Exchangeable Na / CEC × 100
Explanation
Base saturation (%) is calculated as the percentage of the cation exchange capacity occupied by exchangeable base cations.
2
Which extract is commonly used for determination of Cation Exchange Capacity (CEC) of soil?
A 1 N NH₄OAc (pH 7.0)
B 0.5 M NaHCO₃
C 1 N KCl
D DTPA solution
E Mehlich-3 extract
Explanation
Cation Exchange Capacity (CEC) is commonly determined using 1 N ammonium acetate (NH₄OAc) buffered at pH 7.0, which replaces exchangeable cations from the soil exchange complex.
3
What is the porosity percentage if particle density is 2.6 g/cm³ and bulk density is 1.3 g/cm³?
A 35%
B 40%
C 50%
D 55%
E 60%
Explanation
Porosity = [1 − (Bulk density / Particle density)] × 100 = [1 − (1.3 / 2.6)] × 100 = 50%.
4
Chemical formula of pyrite reclamant is
A FeS
B FeS₂
C CuS
D MnS
E Fe₂S₃
Explanation
Pyrite (FeS₂) is used for reclaiming sodic soils because its oxidation produces sulphuric acid, which helps replace exchangeable sodium.
5
Which one is the dominating salt in alkali (sodic) soils?
A Calcium chloride
B Magnesium sulphate
C Sodium bicarbonate
D Sodium carbonate
E Sodium chloride
Explanation
Sodium carbonate is the dominant salt in sodic (alkali) soils and is responsible for their high pH and poor physical properties.
6
Unconsolidated material overlying bedrock is known as
A Solum
B Regolith
C Bedrock
D A horizon
E Parent rock
Explanation
Regolith is the unconsolidated layer of weathered material that overlies solid bedrock.
7
Cation exchange capacity (CEC) of mica is
A Low
B Moderate
C High
D Very high
E Negligible
Explanation
Mica has a comparatively low cation exchange capacity because much of its negative charge is neutralized by fixed potassium ions.
8
Concentration of nitrogen in soil air is approximately
A 70%
B 74%
C 78%
D 82%
E 21%
Explanation
Soil air contains about 78% nitrogen, similar to atmospheric air, although oxygen and carbon dioxide concentrations differ.
9
Permafrost is a layer where soil temperature remains
A ≤ 0°C
B ≈ 0°C
C 0 to 100°C
D ≤ 10°C
E Below −10°C
Explanation
Permafrost is ground that remains at or below 0°C continuously for at least two consecutive years.
10
Which of the following is an example of a natural chelating agent?
A EDTA
B DTPA
C Citric acid
D EDDHA
E Oxalic acid
Explanation
Citric acid is a naturally occurring organic acid that acts as a natural chelating agent by forming complexes with metal ions.
11
Molybdenum is a component of
A Urease
B Nitrogenase
C Nitrate reductase
D Both nitrogenase and nitrate reductase
E Nitrite reductase
Explanation
Molybdenum is an essential constituent of both nitrogenase and nitrate reductase enzymes involved in nitrogen fixation and nitrate reduction.
12
Which compound is commonly used as a urease inhibitor?
A Dicyandiamide
B Thiourea
C Urea formaldehyde
D Phenyl phosphorodiamidate
E Neem oil
Explanation
Phenyl phosphorodiamidate (PPD) is a recognized urease inhibitor that slows urea hydrolysis and improves nitrogen use efficiency.
13
Availability of which micronutrient increases with increase in soil pH?
A Boron
B Iron
C Zinc
D Molybdenum
E Copper
Explanation
Unlike most micronutrients, molybdenum becomes more available as soil pH increases because molybdate is more soluble under alkaline conditions.
14
In which soil is zinc availability to crops generally highest?
A Acidic soil
B Alkaline soil
C Calcareous soil
D Waterlogged soil
E Saline soil
Explanation
Zinc availability is greatest in acidic soils and decreases in calcareous and alkaline soils due to reduced solubility.
15
Which pair is NOT correctly matched?
A C/P ratio <200 – Net mineralization
B 200–300 – No net gain/loss
C >300 – Net immobilization
D >400 – Net mineralization
E <100 – Rapid mineralization
Explanation
Very high C/P ratios promote net immobilization of phosphorus rather than mineralization, making this pair incorrect.
16
Grass tetany in forage crops is primarily associated with deficiency of
A Magnesium
B Sulphur
C Calcium
D Manganese
E Potassium
Explanation
Grass tetany is primarily caused by magnesium deficiency in forage, leading to hypomagnesemia in grazing animals.
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3m 30s Challenge Info
Date 06 July 2026
Subject Agriculture Core
Topic Soil Science
Questions 15 MCQs
Negative 0.25 / wrong
Attempted 125+
Learner Voices
What Aspirants Said About This Challenge
Real feedback from 125+ students who attempted the Soil Science challenge on 06 Jul 2026
PR
Prudhvi Raj
Attempted & rated this challenge
Hard Excellent
LM
Likhita Madaka
Attempted & rated this challenge
Hard Excellent
MY
Manjula Yadav
Attempted & rated this challenge
Hard Excellent
KN
KAVITHA NARLA
Attempted & rated this challenge
Hard Good
About This Challenge
Soil Science MCQs for IBPS SO 2026 06 Jul 2026
This AgriPrep Daily Challenge, held on 06 July 2026, tested aspirants on Soil Science — a core topic under Agriculture Core — through 15 carefully curated MCQs following the exact IBPS SO 2026 exam pattern. Each question carries 1 mark with a negative marking of 0.25 marks per wrong attempt.
Daily challenge practice on AgriPrep.in mirrors the actual IBPS SO Prelims environment — time pressure, negative marking, and topic-specific depth — making it one of the most effective ways to build exam-ready knowledge in Soil Science.
Why Soil Science Matters
Exam Relevance for IBPS SO
- Soil Science is a Agriculture Core topic and frequently tested in IBPS SO Prelims, often carrying 2–4 questions in past papers.
- Conceptual clarity in Soil Science helps answer both direct and applied questions, which make up the majority of the paper.
- The 15 questions in this set cover diverse sub-angles of Soil Science, ensuring comprehensive coverage rather than rote recall.
- Attempting this challenge daily builds topic-wise accuracy and reduces negative-marking risk on exam day.
How to Use This Page
Maximise Your Review Session
- Attempt first, review later. If the arena is still live, attempt the challenge before reading solutions — this builds genuine exam habit.
- Read every explanation. Even if you answered correctly, the explanation reveals deeper logic and connected concepts.
- Note your weak patterns. Track which option types you commonly confuse — most errors in Soil Science follow predictable patterns.
- Check the leaderboard. Compare your score against top rankers to set a realistic target for the next challenge.
Frequently Asked
Questions About This Challenge
What is the correct answer for Soil Science questions in IBPS SO July 2026?
Detailed correct answers and explanations for all 15 Soil Science MCQs from the 06 July 2026 challenge are available on this page after 09:15 PM IST.
How many questions were asked on Soil Science in the AgriPrep Daily Challenge on 06 Jul 2026?
15 multiple-choice questions on Soil Science (Agriculture Core) were asked in the IBPS SO Daily Challenge on 06 July 2026.
When are results declared for the AgriPrep IBPS SO Daily Challenge?
Results and the full leaderboard are declared at 9:15 PM IST on the challenge day. Answer keys are released at 09:15 PM IST.
Is Soil Science important for IBPS SO 2026?
Soil Science falls under Agriculture Core and is a regularly tested topic in IBPS SO Prelims. Daily MCQ practice on AgriPrep.in builds both speed and accuracy.
Practice Daily. Rank Higher. Clear IBPS SO 2026.
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