Agriculture - 1 - Free MCQ Practice Test with solutions, UPSC Geography

Kulhs are traditional gravity-fed surface channels that divert water from mountain streams (locally called khuds) through small diversion structures and carry it by earthen or masonry channels to agricultural fields.

These systems are community-managed, rely on simple gravity flow (no mechanical pumping), and are maintained collectively by the irrigating farmers; water distribution is commonly regulated by time-based turns and customary rules.

They have been in use for centuries (over 400 years) in the western Himalayan region and represent a sustainable, low-cost form of irrigation adapted to steep terrain.

A typical community kuhl serves about 6 to 30 farmers and irrigates roughly 20 ha of land, supporting local agriculture and domestic water needs.

1, 2 and 3

Statements 1 and 2 are correct because this form of cultivation is typically labor-intensive, relying on manual labour, and is practised with a low level of technology (simple tools and traditional methods).

Statement 3 is correct: cultivators clear forest patches and cultivate them for a few years (often about 2-3 years), then abandon the plot and let it lie fallow so the poor soils can recover; fallow periods may extend to around 20-30 years depending on vegetation and population pressure.

Statement 4 is incorrect because the practice is extensive and transient; intensive inputs such as chemical fertilizers are generally not used in shifting cultivation.

2, 3 and 4

Double cropping succeeds where there is a reliable water supply, a sufficiently long growing season and fertile soils. A dependable water source is often provided by good irrigation facilities, allowing two successive crops (for example, wheat-rice) to be grown in one year.

A long growing period is necessary so that two crops can complete their growth cycles within the available season; without this, fitting two full crops is not feasible.

Alluvial soils are highly fertile and retain moisture well, making them especially suitable for intensive practices such as double cropping.

By contrast, a lot of rainfall is not a strict requirement: adequate moisture can come from irrigation, so heavy rainfall is helpful but not essential for double cropping. Therefore the correct conditions are the ones listed above.

All the four

Warm temperature: Tea thrives in a warm, humid climate with an optimum temperature of about 20-30°C; frost-free conditions and mild winters favour continuous leaf growth.

High rainfall: Well-distributed annual rainfall of approximately 150-250 cm is required; heavy rainfall supports vigorous growth provided there is no waterlogging.

High altitude: Hilly, highland locations are favourable because cooler, misty conditions at higher elevations slow growth and improve leaf quality and flavour; tea is grown in both lowland and highland areas, but high altitudes are generally preferred for premium teas.

Sloping land: Slopes ensure natural drainage and prevent water stagnation, which is harmful to tea bushes; properly managed slopes also aid plucking and reduce fungal problems.

Soil and drainage: Tea requires humus-rich, acidic, well-drained soils (often loamy or lateritic) that retain moisture without becoming waterlogged.

All four factors together-warm temperature, high rainfall, high altitude (where available) and sloping, well-drained land-constitute the ideal conditions for healthy tea cultivation.

1, 2 and 4

Statement 1 - True. The average size of operational holdings in India is very small (about 1.08 hectares, 2015-16), and widespread fragmentation due to inheritance and land division prevents economies of scale, discourages investment in inputs and infrastructure, and makes mechanization uneconomical, all of which reduce productivity.

Statement 2 - True. Continued reliance on traditional farming practices - such as use of unimproved seeds, inadequate nutrient management, minimal soil testing, and low adoption of modern agronomic practices - limits yield potential compared with improved varieties, balanced fertilization, integrated pest management and improved crop husbandry.

Statement 3 - False. A shortage of farmers is not a primary reason for low yields in India; in fact, agriculture employs a large share of the population. The major constraints are low productivity per hectare caused by factors listed above (landholding structure, practices, inputs, irrigation, access to credit and markets), not an absolute scarcity of farmers.

Statement 4 - True. Low levels of farm mechanization reduce the timeliness and efficiency of critical operations (land preparation, sowing, interculture and harvesting), increase post-harvest losses and limit the adoption of precision and conservation practices that raise yields.

Therefore, the chief causes among the given statements are 1, 2 and 4, while statement 3 is not a correct cause of low crop yields.

A - iv, B - iii, C - i, D - ii

Tea (A → iv): Grows best on hill slopes with well-drained, slightly acidic loamy soils rich in humus; these soils provide good drainage, aeration and retain sufficient moisture at higher altitudes, which suits tea plantations.

Millets (B → iii): Are hardy crops adapted to light, sandy, less fertile soils with low moisture-holding capacity; they tolerate poor fertility and drought conditions common on marginal lands.

Rice (C → i): Requires fertile alluvial soils with a clayey subsoil that retain water for paddy cultivation; such soils on flat river plains are ideal for standing water and high yields.

Coffee (D → ii): Prefers deep, well-drained loamy soils rich in organic matter, usually on shaded hill slopes; these soils ensure good root development, drainage and sustained fertility for quality coffee.

Tea - it thrives under conditions of more than 200 cm annual rainfall and on sloping hills because slopes provide good drainage, preventing waterlogging that damages tea bushes.

Tea requires a humid climate, acidic and well-drained soils (optimal pH 4.5-5.5), and often benefits from cooler temperatures at elevation; these factors together make hill regions especially suitable for plantation.

For these reasons, tea is the most appropriate crop for the described environmental conditions.

Black soil is formed mainly from the weathering and solidification of basaltic lava during volcanic activity, especially over the Deccan Plateau.

Its characteristic features are a deep black colour, high clay content (colloidal nature), stickiness when wet and tendency to crack on drying. The high clay content and colloidal structure give it excellent moisture retention, so it requires relatively little irrigation.

The soil is rich in minerals such as iron, magnesium and aluminium (notably lacking high available nitrogen), and is locally called Regur. It is especially suitable for crops like cotton (hence "black cotton soil"), groundnut, soybean and some millets.

Commercial grain farming: This involves monoculture - the large-scale cultivation of a single crop (typically cereals such as wheat, rice or maize) across extensive contiguous fields, aimed at market sale rather than just household consumption. It commonly uses high-yield varieties, mechanization and chemical inputs like fertilizers and pesticides to maximize productivity.

By contrast, shifting cultivation rotates small plots with periods of fallow and often practices mixed cropping; subsistence farming prioritizes diverse crops for household needs rather than large-area single-crop production; and organic farming refers to production without synthetic inputs and is not defined by large-scale monoculture.

Hence, large-area single-crop production is a defining feature of commercial grain farming, which is why it is the correct option.

Millets and Rice: These are staple cereals commonly cultivated on small farms primarily for household consumption, so they are associated with subsistence farming. Millets (for example, jowar, bajra, ragi) are typically grown in rainfed, dryland areas with low inputs and are largely used to meet family food needs. Smallholder rice cultivation in many regions likewise supplies the household, though rice can also be grown on a larger, commercial scale where irrigation and market orientation exist.

By contrast, crops such as cotton and tobacco are commercial (cash) crops, while tea and coffee are grown as plantation crops for sale in domestic and export markets. Vegetables and fruits belong to horticulture and may be grown both for household use and for market sale, depending on farm size and location.

Philippines

The dapog method was developed in the Philippines and is now used in parts of South and Southeast Asia as a traditional soil-less nursery technique.

In this system, rice seedlings are raised without any soil by germinating seeds on a support (mats or trays) with only water, air and sunlight provided; the seedlings are later transplanted into the field.

Rice seeds contain reserve food in the endosperm, which can sustain the young seedling for up to 14 days, making soil-free nursing feasible for the early growth stage.

The dapog method therefore produces uniform, evenly aged seedlings, reduces nursery land and soil requirements, and simplifies transplanting operations.

Sugarcane

The disease red rot is caused by the fungus Colletotrichum falcatum, which specifically infects sugarcane.

Typical symptoms are reddening and disintegration of internal cane tissues (pith and vascular bundles), sometimes accompanied by white mycelial growth and pinkish spore masses; infected canes become brittle or hollow and show wilting and drying of leaves, and infected setts give poor germination.

Control measures include the use of resistant varieties, planting healthy setts, hot-water treatment of setts, removal and burning of infected canes (sanitation), and timely fungicidal treatment as recommended.

A (ii), B (i), C (iv), D (iii)

A - Rice: Rice is a warm-season crop that requires a humid climate and high soil moisture; its favorable temperature range for growth and yield is about 20-35 °C. This range corresponds to the item listed at (ii).

B - Tea: Tea grows best in cool, humid regions with well-distributed rainfall; the suitable temperature range is approximately 18-30 °C, matching the item at (i).

C - Cotton: Cotton needs a long, warm growing season with relatively high temperatures and a frost-free period; its typical optimal range is about 21-30 °C, corresponding to the item at (iv).

D - Coffee: Coffee (especially Arabica) prefers cool, shaded hill slopes with moderate temperatures; the ideal mean temperature is near 15-24 °C (often quoted around 20 °C), which matches the item at (iii).

1 and 3

The practice of terracing and contour bunding involves constructing stepped benches or embankments along lines of equal elevation. These measures convert steep slopes into level or gently sloping segments, which reduce runoff velocity, increase infiltration, and significantly decrease soil erosion, making them effective soil-conservation techniques in hilly areas.

Contour ploughing means ploughing and planting along the natural contour lines of a slope. Furrows placed across the slope slow surface water flow, promote water retention, and limit the loss of topsoil, so this practice is also appropriate for erosion control on slopes.

Shifting cultivation (slash-and-burn or jhum) involves clearing and cultivating land for a short period and then abandoning it. Although traditionally used in some hill regions, it causes deforestation, loss of soil structure and fertility, and increased soil erosion over time, so it is not considered a soil-conserving method.

Therefore, methods 1 and 3 are suitable for soil conservation in hilly regions, while method 2 is not.

1 and 2

Statement 1 - True. The Peninsular region has an undulating relief underlain by hard crystalline rocks, which makes large-scale excavation for canals difficult and limits the availability of groundwater for deep wells. Consequently, surface-storage structures are preferred.

Statement 2 - True. Many rivers in this region are seasonal (rainfed) and largely dependent on the monsoon; they dry up or have very low flows in the dry season and cannot sustain perennial canal systems, so local storage of monsoon runoff in tanks is needed.

Statement 3 - False. It is not the compact nature of population and fields but the scattered/clustered settlement pattern of villages and small agricultural patches that favors tank irrigation, because tanks are small, locally managed reservoirs that serve nearby fragmented plots.

Therefore, only statements 1 and 2 are correct while statement 3 is incorrect.