Question

Difficulty: Very hardVegetation Zones and Distribution in Nigeria

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

  • Mangrove Swamp ForestHalophytic stilt-rooted trees (e.g., Rhizophora racemosa) with pneumatophores adapted to daily tidal inundation and saline mudflats along the coast.
  • Northern Guinea SavannaFire-resistant, thick-barked broad-leaved deciduous trees (e.g., Isoberlinia doka) with a tall grass understory, subject to annual bush burning.
  • Sudan SavannaXerophytic, thorny scattered trees with umbrella-shaped crowns (e.g., Acacia spp. and Adansonia digitata) interspersed with short, feathery grasses.
  • Montane VegetationStunted evergreen cloud-forest species, tree ferns, and temperate-like alpine turf grasses restricted to high elevations above 1,200 meters.

Answer

Mangrove Swamp Forest pairs with halophytic stilt-rooted trees; Northern Guinea Savanna pairs with fire-resistant thick-barked deciduous trees (Isoberlinia doka); Sudan Savanna pairs with xerophytic thorny trees (acacia and baobab); Montane Vegetation pairs with stunted evergreen cloud-forest scrub and alpine grasses above 1,200 meters.
Vegetation distribution in Nigeria follows both a south-to-north latitudinal rainfall gradient and an altitudinal gradient. Coastal saline environments host stilt-rooted Mangroves. The Northern Guinea belt is dominated by fire-resistant Isoberlinia trees. Drier northern latitudes host xerophytic Sudan Savanna species like Acacia and Baobab. High elevations on plateaus over 1,200m create Montane grass and scrub biomes.

Step-by-Step Solution

1
Analyze coastal and aquatic vegetation belts
Identify Mangrove Swamp Forest as saline, intertidal, and stilt-rooted with Rhizophora species.
Coastal mangrove swamps require adaptations to daily brackish/saline tidal movements.
2
Examine central savanna woodland belts
Identify Northern Guinea Savanna with Isoberlinia woodland and fire-adapted thick bark.
Annual dry season fires in the Guinea savanna select for pyro-resistant tree species.
3
Examine semi-arid northern savanna belts
Identify Sudan Savanna with xerophytic trees such as Acacia and Baobab.
Low precipitation and high evapotranspiration in the far north favor water-storing and small-leaved thorny species.
4
Examine highland vegetation anomalies
Identify Montane Vegetation with high-elevation turf grass and cloud forest species.
Lapse rate cooling at high altitudes (Jos and Mambilla Plateaus) creates a temperate microclimate distinct from surrounding lowlands.

Key Concept

Spatial Zonation and Plant Adaptations Across Nigerian Biomes
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