Regional Geography of Nigeria

Arrange the following vegetation zones of Nigeria in sequential order of decreasing average annual rainfall, starting from the zone with the highest rainfall to the zone with the lowest rainfall:

Match each climatic region of Nigeria on the left with its correct characteristic feature on the right.

Match each major Nigerian river listed on the left with its correct physical source area and primary drainage destination on the right.

During a pedological survey of the middle belt region of Nigeria, soil profile pits over crystalline basement rocks reveal reddish-brown sandy-clay subsoils underlain by an impermeable, iron-rich indurated layer. Following clear-cutting of Guinea savanna vegetation, intense seasonal drying has accelerated surface crusting and sheet wash. Which combination of soil process and management practice is most appropriate for restoring productivity to this soil type?

In the crystalline Basement Complex terrain of Southwestern Nigeria, soil characteristics vary systematically along a hillslope profile (soil catena). Arrange the following soil types/zones in the correct order from the hilltop (summit) down to the valley bottom.

The Jos Plateau functions as Nigeria's principal hydrographic center, exhibiting a centrifugal (radial) drainage network due to its elevated elevation and dome-like structure. Which of the following options correctly identifies three rivers originating from this highland together with their respective ultimate drainage basins?

Which of the following atmospheric mechanisms is primarily responsible for the progressive northward decrease in mean annual precipitation and wet season duration across Nigeria?

During the dry season in Nigeria, a dust-laden wind blows from the Sahara Desert across the country, causing dry and hazy weather conditions. Which air mass is primarily responsible for bringing these conditions?

During the Northern Hemisphere winter (December to January), meteorological records show that Maiduguri experiences a mean diurnal temperature range exceeding $15^\circ\text{C}$, whereas Calabar records a diurnal temperature range of less than $6^\circ\text{C}$. Which of the following atmospheric mechanisms is primarily responsible for this spatial variation in daily thermal range across Nigeria?

Regarding the territorial limits of West Africa, Nigeria shares its direct land borders with four sovereign nations: the Republic of Benin to the west, the Niger Republic to the north, Chad to the northeast, and Cameroon to the east.

Match each Nigerian vegetation zone listed on the left with its corresponding defining ecological characteristic and indicator flora on the right.

Which of the following drainage basins in Nigeria is unique for forming an inland drainage system, where rivers flow inland into a lake rather than discharging directly or indirectly into the Atlantic Ocean?

Arrange the following major urban nodes along Nigeria's Western Railway corridor in geographical sequence, starting from the southern coastal terminus and proceeding northwards to the interior northern terminus:

A biogeographical survey conducted along longitude $7^\circ\text{E}$ from latitude $4^\circ\text{N}$ to $13^\circ\text{N}$ across Nigeria records distinct changes in plant structure and ecological adaptations. Around latitude $9^\circ\text{N}$, the landscape is dominated by open woodland with tall tussock grasses reaching $1.5\text{ m}$ to $3\text{ m}$, broad-leaved deciduous trees possessing thick fire-resistant bark, and scattered economic species such as the shea butter tree (*Vitellaria paradoxa*) and locust bean (*Parkia biglobosa*). Which vegetation zone of Nigeria is located at this specific latitude?

When travelling across Nigeria along a direct south-to-north transect from Port Harcourt to Maiduguri, which vegetation belt is encountered immediately north of the Guinea Savanna before reaching the extreme northern Sahel margin?

In the regional pedological zonation of Nigeria, which soil group is predominantly found within the humid tropical rainforest belt of the south and is heavily leached due to high rainfall?

In the seasonally flooded floodplains and low-lying river valleys of Nigeria (commonly referred to as Fadama lands), intensive dry-season agriculture is widely practiced. Which soil type dominates these riverine environments, and what key characteristic accounts for its high agricultural productivity?

Although irrigated paddy rice and sugarcane yield abundant harvests in the river floodplains (fadama) of Sokoto and Niger states, commercial perennial tree crops like cocoa and rubber cannot be successfully cultivated in these regions. Which environmental constraint primarily accounts for this agricultural boundary?

Different agricultural crops in Nigeria are adapted to distinct ecological zones based on their moisture requirements. Arrange the following crops in sequence based on their mean annual rainfall requirements, starting from the crop with the highest rainfall requirement to the crop with the lowest rainfall requirement.

Which vegetation zone occupies the largest geographical extent in Nigeria and is characterized by tall grasses interspersed with scattered, fire-resistant broad-leaved trees such as the shea butter tree and locust bean?