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Difficulty: HardVegetation Zones and Distribution in Nigeria

An ecological study evaluates plant structural adaptations and indicator species across Nigeria's major biomes. Which of the following statements accurately matches a Nigerian vegetation zone with its defining structural adaptation and characteristic flora?

  1. Guinea Savanna: Deciduous trees with thick fire-resistant bark, such as Isoberlinia and Lophira, growing alongside tall tussock grassesAnswer
  2. B
    Sudan Savanna: Dense multi-layered evergreen canopy with buttress roots, dominated by oil palm and cocoa trees
  3. C
    Sahel Savanna: Stilt roots and respiratory pneumatophores, predominantly featuring Rhizophora and Avicennia mangrove species
  4. D
    Freshwater Swamp Forest: Short thorny trees, fine-leaved acacias, and ephemeral grasses adapted to nine months of continuous drought

Answer

Guinea Savanna is accurately defined by deciduous trees with thick fire-resistant bark, such as Isoberlinia and Lophira, interspersed with tall tussock grasses.
The Guinea Savanna covers the broadest area in middle-belt Nigeria and is characterized by open woodland containing fire-resistant trees like Isoberlinia and Lophira, along with tall tussock grasses adapted to annual dry-season burning.

Step-by-Step Solution

1
Analyze the ecological adaptations of the Guinea Savanna belt in Nigeria.
The Guinea Savanna experiences distinct wet and dry seasons with periodic bush fires, leading to adaptations like thick, fire-resistant bark and deciduous leaf-shedding.
Matching structural adaptations to climatic stress identifies the correct ecological belt.
2
Identify key floral species associated with Guinea Savanna.
Dominant species include Isoberlinia, Lophira procera, Daniellia oliveri, and tall grasses (e.g., Pennisetum).
Indicator species verify vegetation zone classification.
3
Evaluate and eliminate options that incorrectly pair northern dry belts with coastal or rainforest adaptations.
Options placing rainforest cash crops in the Sudan zone or mangrove/desert flora in opposing latitudinal extremes are incorrect.
Verifies that distractors contain clear misattributions of vegetation characteristics across Nigeria's north-south gradient.

Key Concept

Vegetation Zones and Floral Adaptations in Nigeria
Estimated Time:2m 0s
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Topics

Vegetation Zones and Distribution in Nigeria

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