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Question

Difficulty: HardBiomes and Aquatic/Terrestrial Habitats

Match each Nigerian biome or ecological zone in Column A with its corresponding environmental profile and indicator vegetation in Column B.

  • Southern Guinea SavannaOpen woodland with tall grasses (up to 3 m) and fire-resistant trees such as Lophira lanceolata and Daniellia oliveri.
  • Sahel SavannaLow annual rainfall (< 500 mm), desert-like scrubland dominated by sparse Acacia species, date palms, and short tussock grasses.
  • Montane VegetationReduced mean temperatures, high relative humidity, frequent mist formation, and mountain grassland vegetation.
  • Mangrove SwampHigh soil salinity, periodic tidal inundation, and dominance of Rhizophora species with stilt roots and pneumatophores.

Answer

Southern Guinea Savanna matches open woodland with tall grasses and fire-resistant trees (Lophira lanceolata); Sahel Savanna matches low annual rainfall (< 500 mm) scrubland with Acacia; Montane Vegetation matches reduced mean temperatures, high relative humidity, and mist formation; Mangrove Swamp matches high soil salinity, periodic tidal inundation, and Rhizophora species with pneumatophores.
Each Nigerian biome is characterized by unique abiotic gradients and vegetation adaptations. Southern Guinea Savanna consists of open woodland with tall grasses and fire-resistant trees like Lophira lanceolata. Sahel Savanna is semi-arid with low rainfall (< 500 mm) and drought-tolerant Acacia. Montane areas display reduced temperatures, mist, and highland grasses due to elevation. Mangrove Swamps feature high salinity, tidal dynamics, and Rhizophora mangroves.

Step-by-Step Solution

1
Identify the ecological characteristics of the Southern Guinea Savanna.
It represents an open woodland ecosystem featuring tall grasses and fire-adapted tree species such as Lophira lanceolata.
It occupies the sub-humid tropical vegetation zone south of the drier Sudan savanna.
2
Analyze environmental conditions in the Sahel Savanna.
It experiences severe water deficit (< 500 mm rain per year) and contains sparse, drought-tolerant vegetation like Acacia.
It forms the semi-arid northern boundary of Nigeria adjacent to the Sahara desert.
3
Determine the microclimatic features of Montane Vegetation.
It is defined by altitude-driven temperature drops, elevated relative humidity, mist formation, and highland grasses.
High elevation lowers ambient temperatures and increases cloud condensation relative to surrounding lowland savannas.
4
Characterize coastal Mangrove Swamp habitats.
They are saline wetland biomes influenced by tides, anoxic muds, and stilt-rooted Rhizophora species.
Estuarine conditions require specialized morphological adaptations like pneumatophores for gas exchange.

Key Concept

Abiotic profiles, indicator flora, and microclimatic adaptations of Nigerian biomes
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Topics

Biomes and Aquatic/Terrestrial Habitats

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