Shankar IAS MCQs: Agriculture | Famous Books for UPSC Exam (Summary & Tests) PDF Download

Q1: Statement 1: Wetland farming involves growing crops in soils submerged by natural water flow.
Statement 2: Wetland farming is practiced in areas with abundant rainfall and natural water bodies.
(a) Statements are true, and Statement 2 is the correct explanation of Statement 1.
(b) Both statements are true, but Statement 2 is not the correct explanation of Statement 1.
(c) Statement 1 is true, but Statement 2 is false.
(d) Statement 1 is false, but Statement 2 is true.
Ans: (b)

Explanation: Wetland farming does involve cultivation in soils that are seasonally or permanently inundated and adapted to waterlogging. However, it is not restricted to areas with abundant natural rainfall or natural water bodies; wetlands can be coastal, riverine, or artificially managed (for example, through controlled irrigation or constructed wetlands). Therefore both statements are true but Statement 2 does not fully explain Statement 1.

Q2: Assertion (A): Integrated Farming System (IFS) enhances overall productivity and provides consistent income.
Reason (R): IFS optimizes the use of land, labor, time, and available manures on the farm.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)

Explanation: Integrated Farming System combines crops, livestock, aquaculture, horticulture and other enterprises to use farm resources more efficiently. By optimising land, labour, time and farm inputs (including manures and crop residues) it increases productivity and stabilises farm income. Hence the reason correctly explains the assertion.

Q3: Consider the following statements about soil:
Statement 1: Loam soil is rich in nutrients and humus.
Statement 2: Sandy soil is suitable for crops requiring high water retention.
(a) Only Statement 1 is correct.
(b) Only Statement 2 is correct.
(c) Both Statement 1 and Statement 2 are correct.
(d) Neither Statement 1 nor Statement 2 is correct.
Ans: (a)

Explanation: Loam soil is a balanced mixture of sand, silt and clay and typically contains good levels of nutrients and organic matter (humus), making it fertile. Sandy soil has large particles and drains quickly; it has low water-holding capacity and is therefore unsuitable for crops that need high water retention.

Q4: Arrange the following stages of soil erosion in the correct sequence:
1. Splash Erosion
2. Gully Erosion
3. Sheet Erosion
4. Rill Erosion
(a) 1, 3, 4, 2
(b) 1, 4, 3, 2
(c) 4, 3, 1, 2
(d) 2, 3, 1, 4
Ans: (a)

Explanation: The typical progression begins with splash erosion (impact of raindrops displacing soil), which can lead to sheet erosion (thin layer removal over the surface). Concentrated flow then forms rills (small channels), and if unchecked these rills enlarge into gullies. Thus the sequence 1 → 3 → 4 → 2 is correct.

Q5: Statement 1: Organic farming avoids the use of synthetic fertilizers and pesticides.
Statement 2: Organic farming aims to build ecological balance and conserve biodiversity.
(a) Both statements are true, and Statement 2 is the correct explanation of Statement 1.
(b) Both statements are true, but Statement 2 is not the correct explanation of Statement 1.
(c) Statement 1 is true, but Statement 2 is false.
(d) Statement 1 is false, but Statement 2 is true.
Ans: (a)

Explanation: Organic farming excludes synthetic chemical fertilisers and pesticides, relying on biological and cultural practices instead. This approach is intended to maintain and enhance ecological balance and biodiversity by fostering soil health, natural pest regulation and diverse cropping systems; therefore Statement 2 explains the rationale for Statement 1.

Q6: Assertion (A): Zero Tillage farming helps in increasing earthworm activity and organic matter content in the soil.
Reason (R): Zero Tillage farming involves minimal disturbance to the soil, preserving soil structure and biodiversity.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)

Explanation: Zero tillage (no-till) reduces mechanical disturbance of the soil, which helps preserve soil aggregates, moisture and habitat for soil organisms such as earthworms. Over time this can increase organic matter accumulation in the surface layers and improve soil biodiversity, so the reason explains the assertion.

Q7: Consider the following statements about Organic Farming:
Statement 1: Organic farming prohibits the use of synthetic fertilizers and pesticides.
Statement 2: Crop rotation is not a principle of organic farming.
(a) Only Statement 1 is correct.
(b) Only Statement 2 is correct.
(c) Both Statement 1 and Statement 2 are correct.
(d) Neither Statement 1 nor Statement 2 is correct.
Ans: (a)

Explanation: Organic farming forbids synthetic fertilisers and pesticides and relies on crop rotations, green manuring, composting and biological pest control. Crop rotation is a fundamental principle of organic agriculture to maintain soil fertility and break pest and disease cycles; therefore Statement 2 is false.

Q8: Intercropping is the practice of growing two or more crops simultaneously with distinct row arrangements on the same field.
(a) True
(b) False
Ans: (a)

Explanation: Intercropping is the simultaneous cultivation of two or more crops in the same field, often with planned spatial arrangements (such as alternate rows) to optimise light, nutrient and water use and to reduce pests and diseases.

Q9: Assertion (A): Crop rotation helps in preventing monoculture and improving soil health.
Reason (R): Growing different crops successively on the same land prevents nutrient depletion and pest build-up.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)

Explanation: Crop rotation involves growing different crops in succession on the same land, which reduces continuous monoculture, helps restore or maintain soil nutrient balance (for example, including legumes to fix nitrogen), and disrupts pest and disease cycles. Thus the reason correctly explains the assertion.

Q10: Consider the following statements regarding types of crops based on their cotyledons:
Statement 1: Monocots have one cotyledon in the seed.
Statement 2: Dicots have three cotyledons in the seed.
(a) Only Statement 1 is correct.
(b) Only Statement 2 is correct.
(c) Both Statement 1 and Statement 2 are correct.
(d) Neither Statement 1 nor Statement 2 is correct.
Ans: (a)

Explanation: Monocotyledons (monocots) have a single cotyledon in the seed. Dicotyledons (dicots) have two cotyledons, not three; therefore Statement 1 is correct and Statement 2 is incorrect.

Q11: Zero tillage farming leads to higher nitrogen application for organic matter mineralization.
(a) True
(b) False
Ans: (a)

Explanation: In zero tillage systems, reduced soil disturbance can slow the mineralisation of organic nitrogen because organic residues remain more on the surface and microbial activity patterns change. To meet crop nitrogen demands during the transition or in certain climates, additional nitrogen fertiliser may sometimes be required. However, long-term benefits often include improved soil organic matter and biological nitrogen cycling.

Q12: Assertion (A): Organic fertilizers improve the water-holding capacity of soil.
Reason (R): They add humus to the soil, enhancing its ability to retain water.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)

Explanation: Organic fertilisers and organic matter (compost, manure, crop residues) increase soil humus content and improve soil structure, pore distribution and aggregate stability. These changes increase the soil's capacity to retain plant-available water, so the reason explains the assertion.

Q13: Consider the following statements about types of crops based on root systems:
Statement 1: Tap root system crops have a main root that goes deep into the soil.
Statement 2: Fiber-rooted crops have roots that are deep and non-spreading.
(a) Only Statement 1 is correct.
(b) Only Statement 2 is correct.
(c) Both Statement 1 and Statement 2 are correct.
(d) Neither Statement 1 nor Statement 2 is correct.
Ans: (a)

Explanation: Plants with a tap root system possess a dominant main root that penetrates deep into the soil (e.g., carrot, castor). Fibrous (fibre) root systems consist of many thin, branching roots that are generally shallow and spreading, not deep and non-spreading; therefore Statement 2 is incorrect.

Q14: Arrange the following crop classifications based on the length of photoperiod required for floral initiation:
1. Short-day plants
2. Long day's plants
3. Day-neutral plants
(a) 1, 2, 3
(b) 2, 1, 3
(c) 3, 1, 2
(d) 2, 3, 1
Ans: (a)

Explanation: Classification by photoperiod: short-day plants flower when day length is shorter than a critical duration; long-day plants flower when day length exceeds a critical duration; day-neutral plants flower irrespective of day length. The order 1 → 2 → 3 follows that classification.

Q15: Arrange the following crops based on their water requirements from highest to lowest:
1. Rice
2. Wheat
3. Groundnuts
(a) 1, 2, 3
(b) 2, 1, 3
(c) 3, 2, 1
(d) 1, 3, 2
Ans: (a)

Explanation: Rice (paddy) is a high water-requirement crop typically grown in flooded or saturated conditions. Wheat requires moderate water, and groundnut (peanut) is relatively drought-tolerant among the three. Therefore the order 1 (rice), 2 (wheat), 3 (groundnuts) from highest to lowest water requirement is correct.

Q16: Assertion (A): The System of Rice Intensification (SRI) increases yield with less water and reduced chemical inputs.
Reason (R): SRI combines practices like changes in nursery management, transplanting timing, and water management.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)

Explanation: SRI is a set of agronomic practices-young seedlings, wider spacing, reduced plant density, intermittent irrigation (avoiding continuous flooding), active soil aeration and improved management-that can increase plant root growth and yield while using less water and fewer chemical inputs. Thus the reason explains the assertion.

Q17: Consider the following statements about soil components:
Statement 1: Clay has very fine particles and high permeability to water.
Statement 2: Silt particles are finer than sand but coarser than clay.
(a) Only Statement 1 is correct.
(b) Only Statement 2 is correct.
(c) Both Statement 1 and Statement 2 are correct.
(d) Neither Statement 1 nor Statement 2 is correct.
Ans: (b)

Explanation: Clay consists of the finest mineral particles and has very low permeability (it holds water tightly and drains slowly). Silt particles are intermediate in size-finer than sand but coarser than clay-so Statement 2 is correct while Statement 1 is incorrect regarding permeability.

Q18: Assertion (A): Integrated Nutrient Management (INM) is essential for sustainable crop productivity.
Reason (R): INM involves the combination of organic, inorganic, and biofertilizers to replenish soil nutrients.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)

Explanation: INM aims to maintain soil fertility and long-term productivity by using an appropriate mix of organic inputs (manure, compost), inorganic fertilisers and biofertilisers to supply nutrients efficiently and sustainably. This balanced approach explains why INM supports sustainable productivity.

Q19: Assertion (A): Crop rotation is an effective strategy in sustainable agriculture.
Reason (R): It helps in maintaining soil fertility and controlling pests and diseases.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Ans: (a)

Explanation: Crop rotation improves nutrient management (for instance, inclusion of legumes adds nitrogen), breaks pest and disease cycles, and helps manage weeds, thereby contributing to the sustainability of farming systems. The reason therefore explains the assertion.

Q20: Consider the following statements about types of cropping:
Statement 1: Relay cropping involves growing the succeeding crop immediately before the harvest of the standing crop.
Statement 2: In intercropping, two or more crops are grown simultaneously with no distinct row arrangement.
(a) Only Statement 1 is correct.
(b) Only Statement 2 is correct.
(c) Both Statement 1 and Statement 2 are correct.
(d) Neither Statement 1 nor Statement 2 is correct.
Ans: (a)

Explanation: Relay cropping is a sequential system where the succeeding crop is sown before the standing crop is harvested so that the two phases overlap. Intercropping refers to the simultaneous cultivation of two or more crops in the same field with planned spatial arrangements (often distinct rows or patterns) to optimise resource use; therefore Statement 2, which claims there is no distinct row arrangement, is incorrect.