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Question 12441Question →

Match each international environmental convention or protocol listed on the left with its primary global environmental focus on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Ramsar Convention matches Protection and sustainable use of wetlands of international importance; Montreal Protocol matches Phasing out the production and usage of ozone-depleting substances; Kyoto Protocol matches Legally binding targets to reduce greenhouse gas emissions; Basel Convention matches Control of transboundary movements of hazardous wastes and their disposal.

Each international agreement targets a distinct global environmental challenge: the Ramsar Convention preserves wetlands; the Montreal Protocol phases out ozone-depleting chemicals; the Kyoto Protocol addresses greenhouse gas mitigation; and the Basel Convention controls toxic waste transportation.

Step-by-Step Solution

Identify the main mandate of the Ramsar Convention.

Ramsar is focused on wetlands conservation.

Signed in Ramsar, Iran in 1971, its core objective is protecting wetland ecosystems globally.

Identify the primary objective of the Montreal Protocol.

Montreal targets substances that damage the ozone layer.

Adopted in 1987 to control chemical pollutants like CFCs and halons.

Identify the key focus of the Kyoto Protocol.

Kyoto targets climate change and greenhouse gases.

Adopted under UNFCCC in 1997 to enforce emission reduction targets.

Identify the objective of the Basel Convention.

Basel governs hazardous waste management and movement.

Adopted in 1989 to stop dumping of toxic waste across borders.

Key Concept

International Environmental Treaties and Global Conservation Initiatives

Estimated Time:1m 30s

Question 12442Question →

Which soil conservation technique involves plowing and planting along the natural contour lines of a slope to slow surface runoff and reduce soil erosion?

Contour plowing

Down-slope vertical tilling

Continuous application of crude oil derivatives to renew minerals

Enforcing soil management exclusively through NOSDRA

Show answer & explanation

Answer: Contour plowing

Answer

Contour plowing is the conservation technique that follows the natural elevation lines of sloping terrain to slow surface runoff and control soil erosion.

Contour plowing follows the horizontal curves of elevation on sloping land. By plowing perpendicular to the flow of water, each ridge acts as a mini-barrier that traps rainwater, increases infiltration, and prevents soil erosion.

Step-by-Step Solution

Identify the primary cause of soil erosion on sloping land.

Water flowing quickly down slopes creates rills and gullies, removing fertile topsoil.

Topography accelerates gravitational water flow.

Evaluate conservation techniques designed to impede downhill water movement.

Plowing across the slope perpendicular to the downhill direction (along contour lines) acts as small furrows or dams that capture rainwater.

This technique directly mitigates surface runoff speed and soil loss.

Key Concept

Methods and Techniques of Environmental Conservation: Soil Conservation Practices

Question 12443Question →

Southern Nigeria's coastal regions experience a double rainfall maximum with a noticeable drop in precipitation during July and August known as the 'August Break' (Little Dry Season). Which atmospheric mechanism accounts for this temporary dry spell while the Inter-Tropical Convergence Zone (ITCZ) is located at its northernmost position over West Africa?

The deflection of rain-bearing South-West Monsoon winds away from the Atlantic coast toward the Jos Plateau due to orographic suction.

The inland migration of the ITCZ deep into northern Nigeria, placing coastal areas under stable marine air with lower sea surface temperatures and atmospheric divergence.

The temporary southward surge of the dry North-East Trade Winds bringing Continental Tropical (cT) air across southern Nigeria.

The complete weakening and collapse of the Tropical Maritime (mT) air mass over the Gulf of Guinea during the summer solstice.

Show answer & explanation

Answer: The inland migration of the ITCZ deep into northern Nigeria, placing coastal areas under stable marine air with lower sea surface temperatures and atmospheric divergence.

Answer

The inland migration of the ITCZ deep into northern Nigeria, placing coastal areas under stable marine air with lower sea surface temperatures and atmospheric divergence.

The correct option identifies that as the ITCZ advances to its northernmost position over West Africa during July and August, southern Nigeria is positioned well behind the main convective rain belt. Localized oceanic upwelling along the Gulf of Guinea brings cooler water to the coast, creating atmospheric stability, subsidence, and divergence that temporarily suppresses rain-producing convective clouds in the south.

Step-by-Step Solution

Analyze ITCZ position during the northern summer (July–August).

The ITCZ reaches its northernmost latitude (around 20°N–22°N) near the southern border of the Sahara Desert.

Solar heating at the Tropic of Cancer draws moisture-laden Tropical Maritime (mT) winds far into northern Nigeria.

Examine coastal oceanographic and atmospheric conditions in southern Nigeria during this period.

The coastal marine atmosphere undergoes cooling due to localized upwelling along the Gulf of Guinea, generating a temperature inversion and stable air stratification.

Atmospheric stability prevents strong convective updrafts, inhibiting deep cumulonimbus cloud formation along the coast.

Synthesize the mechanism causing the 'August Break' (Little Dry Season).

The deep inland position of the moisture front leaves coastal southern Nigeria under a zone of surface wind divergence and atmospheric stability.

This structural change causes a temporary cessation of heavy convection, creating the double rainfall maximum characteristic of the Sub-Equatorial climate belt.

Key Concept

Atmospheric mechanisms underlying the double rainfall maximum and August Break in Southern Nigeria

Estimated Time:2m 0s

Question 12444Question →

On a topographical map of a river basin drawn to a Representative Fraction (R.F.) scale of $1 : 40,000$ , the distance along a proposed drainage channel between two agricultural settlements measures $14.5\text{ cm}$ . What is the actual ground distance of the drainage channel in kilometers?

Show answer & explanation

Answer: 5.8

Answer

The actual ground distance of the drainage channel is

5.8\text{ km}

The correct answer of

5.8\text{ km}

is obtained by multiplying the map distance of

14.5\text{ cm}

by the R.F. denominator

40,000

(

14.5 \times 40,000 = 580,000\text{ cm}

) and then converting centimeters to kilometers by dividing by

100,000

(

580,000 \div 100,000 = 5.8\text{ km}

Step-by-Step Solution

Calculate the total ground distance in centimeters

580,000\text{ cm}

According to the R.F. scale of

1 : 40,000

1\text{ cm}

on the map represents

40,000\text{ cm}

on the ground.

Convert the ground distance from centimeters to kilometers

5.8\text{ km}

Since

1\text{ km} = 100,000\text{ cm}

, divide the total distance in centimeters by

100,000

Key Concept

Ground distance calculation using Representative Fraction (R.F.) scale

Estimated Time:1m 15s

Question 12445Question →

On a topographical map extract, a major river stream crosses a valley where the V-shaped contour lines point towards the north-east. In which cardinal direction is the river flowing?

North-east, because the river flows in the exact direction that the V-shaped contour apexes point.

South-west, because contour V-shapes point upstream towards higher elevation, meaning the river flows downstream in the opposite direction.

North-west, because river flow always aligns parallel to the strike of contour lines regardless of gradient.

South-east, because water in a valley basin flows towards areas of increasing contour values.

Show answer & explanation

Answer: South-west, because contour V-shapes point upstream towards higher elevation, meaning the river flows downstream in the opposite direction.

Answer

South-west, because contour V-shapes point upstream towards higher elevation, meaning the river flows downstream in the opposite direction.

In practical map reading, whenever contour lines cross a river valley, they form a 'V' pattern pointing toward higher ground (upstream). If the apex of the 'V' points north-east, the elevation increases toward the north-east. Because rivers flow downhill from higher to lower ground, the flow direction must be toward the south-west.

Step-by-Step Solution

Identify the law of V-shaped contours in valley landforms.

V-shaped contour lines crossing a stream or valley always point upstream (towards the source or higher elevation).

Topography rises as you move up a river valley, causing contour lines of higher elevation to bend upstream.

Determine the direction of flow based on the orientation of the contour V-apex.

Since the V-shapes point north-east (upstream), the river must flow downstream towards the south-west.

Water naturally flows from higher elevation to lower elevation, which is directly opposite to the upstream-pointing apex of the contour V-shapes.

Key Concept

Contour V-Rule for River Valley Flow Direction

Question 12446Question →

During an urban spatial survey of a rapidly expanding metropolitan area, geographers notice that industrial zones and distinct socio-economic residential corridors expand outward along major railway lines and highway arteries in wedge-like sectors from the central business district. Which urban land-use model best explains this spatial growth pattern?

Hoyt's Sector Model

Burgess Concentric Zone Model

Rural-Urban Push-Factor Dynamic Model

Demographic Dependency Inversion Model

Show answer & explanation

Answer: Hoyt's Sector Model

Answer

Hoyt's Sector Model accurately accounts for wedge-shaped urban land-use growth along transport corridors.

Hoyt's Sector Model explains that urban land-use zones develop as wedge-shaped sectors radiating from the city center, primarily driven by transport routes such as railways and arterial roads that provide high accessibility.

Step-by-Step Solution

Analyze the spatial pattern described in the scenario.

Identified growth expanding in wedge-like shapes along major rail lines and highway arteries from the urban center.

Transportation routes lower transit costs and time, encouraging specific land uses (like heavy industry or high-income housing) to cluster linearly along these axes.

Evaluate the relevant urban land-use models against the observed pattern.

Homer Hoyt (1939) modified earlier urban models to show that growth occurs in sectors or wedges focused along transit lines.

Burgess proposed concentric rings, whereas Hoyt demonstrated sector growth oriented by accessibility along main transport lines.

Key Concept

Urban Land-Use Models (Hoyt's Sector Model)

Estimated Time:1m 0s

Question 12447Question →

The Witwatersrand basin in South Africa is recognized globally as one of the most prolific gold-producing regions in history. Which of the following statements correctly identifies the geological host environment of these gold deposits and a major physical constraint encountered during their extraction?

The gold deposits are hosted within young metamorphic marble formations, making open-cast strip mining along riverbanks the standard extraction technique.

The gold occurs within ancient Precambrian sedimentary conglomerates, with ultra-deep shaft mining constrained by extreme geothermal heat and severe rock pressure.

The gold reserves represent a continuously replenishing renewable mineral resource generated by ongoing volcanic eruptions along the East African Rift System.

The gold ore is a weight-losing raw material that requires processing plants to be located exclusively at maritime shipping ports under Weber's location principles.

Show answer & explanation

Answer: The gold occurs within ancient Precambrian sedimentary conglomerates, with ultra-deep shaft mining constrained by extreme geothermal heat and severe rock pressure.

Answer

The Witwatersrand gold deposits occur within ancient Precambrian conglomerate rock layers, and mining operations face severe physical constraints due to extreme rock temperatures and high lithostatic pressure at depths exceeding 3,000 meters.

The Witwatersrand gold reserves are embedded within Precambrian banket (conglomerate) rock strata. Because surface deposits were exhausted early, extraction requires ultra-deep vertical shaft systems. At depths exceeding 3,000 meters, miners encounter severe physical challenges, including ambient rock temperatures rising above 50°C (requiring massive refrigeration) and high lithostatic pressure causing catastrophic rockbursts.

Step-by-Step Solution

Analyze the geological setting of the Witwatersrand goldfields in South Africa.

The Witwatersrand basin consists of Archean/Precambrian sedimentary sequence beds containing auriferous (gold-bearing) pebble conglomerates known locally as 'reefs'.

Understanding the host rock classification distinguishes Precambrian sedimentary conglomerates from younger metamorphic or igneous rocks.

Evaluate the operational mining techniques and physical hazards of the basin.

Due to the steep inclination and immense depth of the seams (reaching over 3.5 to 4 km underground), deep vertical shaft mining is mandatory, introducing extreme geothermal gradients (high temperatures) and rockburst risks.

Surface open-cast mining is unsuitable for ultra-deep reef gold seams.

Synthesize the correct option combination.

The correct combination describes Precambrian sedimentary conglomerates paired with deep shaft mining challenges arising from extreme geothermal heat and rock pressure.

This accurately reflects both the physical geology and economic geography of South African mining.

Key Concept

Geological occurrence and deep-shaft mining constraints of South Africa's Witwatersrand goldfield

Question 12448Question →

During the structural evolution of a karst drainage basin, percolating meteoric water enriched with dissolved carbon dioxide descends vertically through unsaturated jointed limestone until it reaches an impermeable stratum. Which of the following correctly identifies the dominant process operating at the water table interface and the resulting subterranean landform?

Chemical solution enlarging horizontal conduits along bedding planes to form phreatic caverns

Corrasion (mechanical river abrasion) carving out vertical V-shaped gorges below the limestone layer

Metamorphic recrystallization forming crystalline marble pillars within subterranean hollows

Downslope gravitational mass movement slumping subterranean roofs into surface dry valleys

Show answer & explanation

Answer: Chemical solution enlarging horizontal conduits along bedding planes to form phreatic caverns

Answer

Chemical solution enlarging horizontal conduits along bedding planes to form phreatic caverns

The correct answer identifies chemical solution enlarging horizontal conduits along bedding planes to form phreatic caverns. As carbonated water descends through joints in permeable limestone and reaches the saturated water table, its flow becomes predominantly horizontal along bedding planes. The continuous solvent action of carbonic acid dissolves calcium carbonate, expanding horizontal fissures into extensive subterranean caverns.

Step-by-Step Solution

Analyze the rainwater movement and chemical agent in karst environments.

Meteoric water absorbs carbon dioxide to form weak carbonic acid (

H_2CO_3

), which dissolves calcium carbonate (

CaCO_3

) in limestone.

Limestone dissolution is driven primarily by chemical carbonation rather than mechanical stream abrasion.

Determine the physical behavior of groundwater at the water table interface.

Vertical percolating (vadose) water reaches the saturated (phreatic) zone and shifts to horizontal lateral flow along bedding planes.

Water cannot easily penetrate deeper impermeable strata, concentrating solvent activity laterally.

Identify the resulting geomorphic feature created at this horizontal interface.

Persistent chemical solution along horizontal planes excavates extensive subterranean cavern networks and cave systems.

Phreatic cavern evolution along bedding planes is the primary landform developed where horizontal groundwater flow dominates.

Key Concept

Karst Cavern Evolution and Underground Water Solution Processes

Estimated Time:2m 0s

Question 12449Question →

Match each weathering or mass wasting process listed on the left with its defining mechanism or physical movement characteristic on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Carbonation matches with the dissolution of limestone by carbonic acid; Hydrolysis matches with chemical alteration forming clay minerals; Solifluction matches with saturated soil flow over permafrost; Soil Creep matches with imperceptibly slow downslope movement causing tilted poles.

Each geographical process corresponds directly to its scientific mechanism: Carbonation dissolves calcium carbonate in limestone landscapes; Hydrolysis decomposes minerals into clay; Solifluction represents saturated soil flow over permafrost; Soil Creep is an ultra-slow downslope creep under gravity.

Step-by-Step Solution

Differentiate between chemical weathering mechanisms

Carbonation involves the action of carbonic acid on limestone, whereas hydrolysis is the chemical breakdown of silicate minerals into clay via reaction with water ions.

Chemical weathering alters the chemical composition of rocks in place.

Distinguish between types and conditions of mass wasting

Solifluction is a specific flow process occurring over impermeable frozen subsoil in tundra/periglacial zones, while soil creep is an extremely slow, continuous downslope movement driven by gravity across temperate and tropical slopes.

Mass wasting processes are classified by movement rate, water content, and climatic environment.

Key Concept

Distinction between chemical weathering processes and mass wasting movements

Estimated Time:1m 30s

Question 12450Question →

In a morphometric analysis of a river basin, a hydrologist counts $32$ first-order streams and $8$ second-order streams using Strahler's stream ordering system. What is the bifurcation ratio between the first-order and second-order streams?

Show answer & explanation

Answer: 4

Answer

The bifurcation ratio between the first-order and second-order streams is 4.

The bifurcation ratio (

R_b

) is obtained by dividing the number of streams of a given order (

N_1 = 32

) by the number of streams of the next higher order (

N_2 = 8

). Therefore,

R_b = \frac{32}{8} = 4

Step-by-Step Solution

Identify the number of streams of order

u

and order

u+1

N_1 = 32

and

N_2 = 8

The bifurcation ratio measures the ratio of the number of stream segments of a given order to the number of segments of the higher order.

Calculate the bifurcation ratio using

R_b = \frac{N_1}{N_2}

R_b = \frac{32}{8} = 4

Dividing the count of first-order streams by the count of second-order streams gives the ratio of stream branching.

Key Concept

Bifurcation Ratio in River Basin Morphometry

Question 12451Question →

Arrange the following geomorphic stages in the correct sequential order describing the evolution of a pre-glacial river valley into a steep-sided glacial trough (U-shaped valley).

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequential order of landform development is: 1. A pre-glacial stream carves a V-shaped valley with interlocking spurs -> 2. Climatic cooling causes snow accumulation, feeding a valley glacier that occupies the river channel -> 3. Basal plucking and active lateral abrasion truncate the interlocking spurs -> 4. Glacial retreat exposes a wide, flat-floored U-shaped trough flanked by truncated spurs and hanging tributary valleys.

The correct order begins with pre-existing fluvial landforms (V-shaped valley with interlocking spurs), followed by valley glacier occupation, active glacial modification (truncation of spurs and wall steepening via abrasion and plucking), and culminates in the post-glacial exposure of a flat-bottomed U-shaped trough with hanging tributary valleys.

Step-by-Step Solution

Identify the initial fluvial topography.

Establish that a V-shaped valley created by stream action with interlocking spurs exists first.

Glacial troughs form by modifying pre-existing river valleys rather than creating new channels from flat terrain.

Determine ice accumulation and valley occupation.

A valley glacier fills the pre-existing V-shaped river path.

Glacial ice must occupy the conduit before glacial erosion processes can begin.

Analyze the active erosion phase during peak glaciation.

Glacial plucking and abrasion shear off interlocking spurs and steepen valley sides.

Ice cannot bend around interlocking spurs like river water; instead, it cuts directly through them.

Identify the post-glacial landscape features upon ice retreat.

Exposure of a steep-sided, flat-floored U-shaped trough with hanging valleys.

Deglaciation reveals the modified valley cross-profile created by ice action.

Key Concept

Glacial Trough Evolution

Estimated Time:2m 0s

Question 12452Question →

The Earth is composed of distinct internal structural layers and external atmospheric envelopes. Arrange the following layers in sequence starting from the innermost center of the Earth and moving outward into space. Which order correctly represents this progression?

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct order from the Earth's center outward is: Barysphere (Inner Core) → Asthenosphere → Lithosphere → Troposphere → Stratosphere.

Moving from the planet's core outward into space, one encounters the central metallic core (Barysphere), the plastic upper mantle (Asthenosphere), the rigid crust and upper mantle shell (Lithosphere), the weather-bearing lower atmosphere (Troposphere), and the ozone-bearing middle atmosphere (Stratosphere).

Step-by-Step Solution

Identify the innermost internal layer of the Earth

The Barysphere forms the central core of the Earth.

It occupies the region at the center of the planet under immense pressure.

Trace upward through the mantle and crust

The semi-fluid Asthenosphere in the upper mantle is encountered before reaching the solid, outer Lithosphere.

The Lithosphere rests directly upon the weaker, ductile Asthenosphere.

Sequence the external atmospheric layers from the surface outward

Crossing the Earth's surface leads first into the Troposphere and then up into the Stratosphere.

The Troposphere is adjacent to the crust, while the Stratosphere lies above the tropopause.

Key Concept

Concentric layer structure of the Earth's internal and external environments

Question 12453Question →

Along the low-lying floodplains of the Niger and Benue Rivers as well as the coastal plains of Nigeria, periodic river flooding deposits rich sediments of silt and clay. Which soil group predominantly characterizes these riverine environments?

Alluvial soils

Regosols

Ferrallitic soils

Ferruginous tropical soils

Show answer & explanation

Answer: Alluvial soils

Answer

Alluvial soils are predominantly found along the floodplains and valleys of major rivers such as the Niger and Benue.

Alluvial soils are formed from rich silt, sand, and organic matter deposited by rivers during seasonal flooding along river basins like the Niger and Benue, making them exceptionally fertile for wet-season and dry-season fadama farming.

Step-by-Step Solution

Identify the geographical context and soil formation mechanism described in the stem.

The stem describes soils formed from silt and sediment deposition by periodic river flooding along low-lying floodplains.

River flood deposits are fluviatile sediments characteristic of riverine environments.

Match the depositional environment to the corresponding Nigerian soil classification group.

Soils derived from recent riverborne sediment deposits along river courses are classified as alluvial (or hydromorphic) soils.

Alluvial soils form specifically through the accumulation of waterborne river sediments.

Key Concept

Alluvial Soil Distribution in Nigeria

Question 12454Question →

During a chain survey along a baseline, a student uses a steel measuring tape that is shorter than its standard designated length. Which type of error will consistently accumulate in the total recorded distance?

Cumulative error

Compensating error

Personal error

Accidental error

Show answer & explanation

Answer: Cumulative error

Answer

Cumulative error

Using an instrument with a fixed structural defect, such as a tape shorter than standard length, causes the measurement discrepancy to accumulate continuously in one direction throughout the survey. This defines a cumulative (systematic) error.

Step-by-Step Solution

Analyze the nature of the faulty instrument

The measuring tape is shorter than its standard length.

Using a shorter tape means every single chain length laid out on the ground will record a value higher than actual distance.

Determine the impact of the fault over multiple measurements

The error constantly adds up in the same direction throughout the fieldwork.

Errors that continuously build up in one direction are classified as cumulative or systematic errors.

Key Concept

Classification of Errors in Elementary Surveying

Question 12455Question →

During the onset of the rainy season in Nigeria, nomadic Fulani pastoralists migrate with their zebu cattle herds away from the moist vegetation of the Middle Belt back toward the drier Sudan savanna of the Far North. What is the primary environmental factor driving this northward transhumance during the wet season?

The seasonal surge of tsetse fly populations in humid southern zones, which increases the incidence of trypanosomiasis among cattle.

The preference of zebu cattle for consuming withered, low-moisture pasture rather than fresh, nutrient-dense green forage.

The total drying up of major river basins and Fadama floodplains in the Niger-Benue trough during rainy months.

The requirement of prolonged sub-zero temperatures and high-altitude frost for successful zebu cattle reproduction.

Show answer & explanation

Answer: The seasonal surge of tsetse fly populations in humid southern zones, which increases the incidence of trypanosomiasis among cattle.

Answer

The primary environmental factor driving northward transhumance during the wet season is the seasonal surge of tsetse fly populations in humid southern zones, which increases the incidence of animal trypanosomiasis.

During the wet season, increased moisture and lush vegetation in the Middle Belt create optimal breeding conditions for tsetse flies, which transmit fatal animal trypanosomiasis (nagana) to zebu cattle. Consequently, pastoralists retreat to the drier Sudan savanna where open terrain and lower humidity suppress tsetse fly populations.

Step-by-Step Solution

Analyze the seasonal migration pattern (transhumance) of pastoralists in Nigeria.

Pastoralists move south toward river valleys during the dry season for water and pasture, and return north during the wet season.

Understanding the environmental constraints in both ecological zones across seasons is necessary to pinpoint the migration cause.

Evaluate the environmental hazards present in the southern savanna/Middle Belt during the rainy season.

Increased rainfall and humidity promote dense vegetation growth, leading to heavy infestation by tsetse flies (vector of trypanosomiasis) and high humidity causing foot rot in zebu cattle.

Zebu cattle are highly susceptible to insect-borne diseases prevalent in humid, bush-covered environments.

Select the option that correctly identifies disease vector ecology as the decisive factor.

The risk of trypanosomiasis carried by tsetse flies in the wetter southern zones compels herdsmen to move cattle back to the drier, open northern savanna.

Drier northern savanna belts are natural low-risk environments for tsetse fly survival during the rainy season.

Key Concept

Transhumance and Environmental Determinants of Pastoralism in Nigeria

Estimated Time:2m 0s

Question 12456Question →

In Nigeria's agricultural zonation, states located within the Middle Belt—such as Benue, Nasarawa, and Niger—are major producers of tuber crops like yam and cassava, yet commercial tree crops such as cocoa and oil palm fail to yield sustained economic output in these areas. Which climatic factor is primarily responsible for limiting the commercial cultivation of tree crops in this zone?

An extended dry period accompanied by insufficient total annual moisture relative to the southern rainforest belt.

Severe frost damage caused by high-elevation winds during the winter months.

Continuous waterlogging resulting from heavy equatorial rainfall throughout the entire year.

Excessive soil salinity caused by coastal ocean tides encroaching into the savanna plains.

Show answer & explanation

Answer: An extended dry period accompanied by insufficient total annual moisture relative to the southern rainforest belt.

Answer

An extended dry period accompanied by insufficient total annual moisture relative to the southern rainforest belt.

Perennial tree cash crops such as cocoa, oil palm, and rubber require humid tropical forest conditions with high annual rainfall evenly distributed throughout the year. The Middle Belt lies within the Guinea savanna zone, where a marked dry season of several months creates a moisture deficiency that tree crops cannot survive commercially. Consequently, the region specializes in tuber and grain crops suited to seasonal rainfall.

Step-by-Step Solution

Identify the ecological requirements of commercial tree crops.

Tree crops such as cocoa, oil palm, and rubber require high annual rainfall (over 1,500 mm to 2,000 mm) and consistently high humidity with a minimal dry season.

Perennial tree crops require sustained soil moisture to survive and produce commercial yields year-round.

Analyze the climatic characteristics of the Middle Belt (Southern Guinea Savanna).

The Middle Belt receives lower annual rainfall (1,000 mm – 1,500 mm) and experiences a distinct dry season lasting 4 to 5 months due to the influence of the Tropical Continental air mass.

This climatic envelope supports annual and root crops (yam, cassava, sorghum) that tolerate seasonal drought, but restricts perennial rainforest tree crops.

Evaluate the options to select the primary limiting factor.

The option citing an extended dry period and insufficient total annual moisture accurately explains the spatial limit of tree crops in Nigeria.

Climatic moisture deficit is the main factor preventing rainforest tree crop cultivation in savanna zones.

Key Concept

Climatic Controls on Crop Belts in Nigeria

Estimated Time:1m 0s

Question 12457Question →

Match each agricultural system listed on the left with its primary operational feature on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Pastoral Nomadism matches seasonal livestock movement across natural pastures; Mediterranean Farming matches specialized commercial cultivation of citrus fruits, olives, and grapes; Commercial Grain Farming matches extensive, highly mechanized monoculture focused primarily on wheat; and Shifting Cultivation matches rotational plot clearing using slash-and-burn methods with long fallow periods.

Each agricultural system is correctly paired with its defining environmental and economic operational method: Pastoral nomadism relies on seasonal mobility; Mediterranean farming focuses on specialized fruit and olive orchards; commercial grain farming uses heavy mechanization for vast wheat fields; and shifting cultivation uses rotational slash-and-burn field clearing.

Step-by-Step Solution

Identify the core operational mechanism of Pastoral Nomadism.

It involves herdsmen migrating with livestock searching for natural pasture and water sources.

Nomadic pastoralists do not cultivate fixed crop fields; their land use is extensive and mobile.

Identify the characteristic crops of Mediterranean Farming.

It is widely recognized for viticulture, citrus fruits, olives, and winter wheat.

The Mediterranean climate regime favours summer drought-resistant tree and vine crops.

Identify the defining features of Commercial Grain Farming.

It utilizes extensive machinery on large farms to grow single grain crops like wheat for export markets.

This agricultural system is capital-intensive and requires flat terrain for tractor and combine harvester operations.

Identify the soil management technique in Shifting Cultivation.

Fields are cleared by burning vegetation, farmed temporarily, and left fallow to regenerate soil fertility.

Tropical soils leach nutrients quickly under continuous cropping without synthetic fertilizer inputs.

Key Concept

Classification and Characteristics of Global Agricultural Systems

Question 12458Question →

Two agricultural processing centers in Osun State are separated by an actual ground distance of $7.5\text{ km}$ . If the distance between these two centers on a regional planning map measures $15\text{ cm}$ , what is the Representative Fraction (R.F.) of the map?

1 : 50,000

50,000 : 1

1 : 5,000

1 : 500,000

Show answer & explanation

Answer: $1 : 50,000$

Answer

The Representative Fraction (R.F.) of the map is

1 : 50,000

To find the Representative Fraction, first convert

7.5\text{ km}

to centimeters (

7.5 \times 100,000 = 750,000\text{ cm}

). Setting up the ratio of map distance to ground distance gives

\frac{15}{750,000}

, which reduces to

\frac{1}{50,000}

, yielding an R.F. of

1 : 50,000

Step-by-Step Solution

Convert the ground distance from kilometers to centimeters.

7.5\text{ km} \times 100,000\text{ cm/km} = 750,000\text{ cm}

Representative Fraction requires both map distance and ground distance to be in identical units.

Formulate the ratio of map distance to ground distance.

\text{Scale} = \frac{15\text{ cm}}{750,000\text{ cm}}

The formula for Representative Fraction is

\text{R.F.} = \frac{\text{Map Distance}}{\text{Ground Distance}}

Simplify the fraction to have a numerator of 1.

\frac{15 \div 15}{750,000 \div 15} = \frac{1}{50,000}

1 : 50,000

An R.F. must always be expressed as a unit fraction (

1 : n

Key Concept

Calculating Representative Fraction (R.F.) from map distance and ground distance

Question 12459Question →

Arrange the following African vegetation zones in descending order of their average annual rainfall, starting from the zone with the highest moisture level to the zone with the driest conditions.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence from highest to lowest annual rainfall is: Tropical Rainforest, Guinea Savanna, Sudan Savanna, and Sahel.

Tropical Rainforest receives the highest precipitation among African vegetation belts, followed by the moist Guinea Savanna, the drier Sudan Savanna, and the semi-arid Sahel zone bordering the desert.

Step-by-Step Solution

Identify the annual rainfall totals associated with each listed African vegetation zone.

Tropical Rainforest (>1,500 mm), Guinea Savanna (1,000–1,500 mm), Sudan Savanna (600–1,000 mm), and Sahel (200–500 mm).

Vegetation zones in West and Central Africa align directly with latitudinal rainfall gradients.

Arrange the zones in descending order from maximum precipitation to minimum precipitation.

Tropical Rainforest comes first, followed by Guinea Savanna, then Sudan Savanna, and finally Sahel.

Moisture availability decreases progressively as distance from the equator increases toward the Sahara Desert.

Key Concept

Latitudinal Rainfall Gradient and Vegetation Zonation in Africa

Question 12460Question →

During a prismatic compass survey along a open traverse line $P-Q-R-S$ , a student records the following forward bearings (FB) and back bearings (BB):

- Line $PQ$ : FB = $045^\circ$ , BB = $225^\circ$
- Line $QR$ : FB = $130^\circ$ , BB = $308^\circ$
- Line $RS$ : FB = $220^\circ$ , BB = $042^\circ$

Based on these field observations, which of the survey stations is affected by local attraction?

Station P

Station Q

Station R

Station S

Show answer & explanation

Answer: Station R

Answer

Station R is affected by local attraction.

Station R is the correct answer because it is the intersection station for both Line QR and Line RS. In magnetic compass surveying, when the difference between forward bearing and back bearing of a line is exactly

180^\circ

, both stations forming that line are free from local magnetic disturbance (as seen with Line PQ). Since Line QR (

308^\circ - 130^\circ = 178^\circ

) and Line RS (

220^\circ - 042^\circ = 178^\circ

) both display a

2^\circ

error, the common station to both lines—Station R—must be the sole source of local attraction.

Step-by-Step Solution

Calculate the difference between Forward Bearing (FB) and Back Bearing (BB) for Line PQ.

|225^\circ - 045^\circ| = 180^\circ

A difference of exactly

180^\circ

indicates that both Station P and Station Q are free from local magnetic attraction.

Calculate the difference between Forward Bearing (FB) and Back Bearing (BB) for Line QR.

|308^\circ - 130^\circ| = 178^\circ

The difference is

178^\circ

, showing a

2^\circ

discrepancy. Either Station Q or Station R is affected by local attraction.

Calculate the difference between Forward Bearing (FB) and Back Bearing (BB) for Line RS.

|220^\circ - 042^\circ| = 178^\circ

The difference is

178^\circ

, showing a

2^\circ

discrepancy. Either Station R or Station S is affected by local attraction.

Synthesize the results to isolate the affected station.

Station R is common to both erroneous lines (QR and RS), while Stations P and Q are verified correct from Line PQ.

Because Station R is present in both lines that exhibit the

2^\circ

magnetic error, Station R is the station experiencing local attraction.

Key Concept

Local Attraction Detection in Prismatic Compass Surveying

Estimated Time:2m 0s

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