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Difficulty: Very hardBiomes and Aquatic/Terrestrial Habitats

An ecological survey conducted along a microclimatic gradient from a high-altitude montane biome (such as the Jos Plateau) down into the surrounding Guinea Savanna recorded distinct shifts in plant morphology, ambient temperature, relative humidity, and soil characteristics. Which combination of environmental factors and plant structural adaptations correctly distinguishes the high-altitude montane zone from the lower-elevation Guinea Savanna?

  1. Lower mean annual temperature, higher relative humidity, and prevalence of dwarf or stunted trees laden with epiphytic mosses and lichensAnswer
  2. B
    Higher mean annual temperature, lower relative humidity, and dominance of broad-leaved evergreen trees with buttress roots and drip tips
  3. C
    Extremely high seasonal temperatures, low atmospheric humidity, and complete absence of bryophytes due to intense solar radiation
  4. D
    Uniform high temperatures year-round, hyper-saline soil conditions, and prop-rooted vegetation with specialized pneumatophores

Answer

Lower mean annual temperature, higher relative humidity, and prevalence of dwarf or stunted trees laden with epiphytic mosses and lichens
The correct answer accurately identifies that montane biomes (such as the Jos Plateau in Nigeria) experience lower mean annual temperatures due to altitude, high relative humidity from cloud/mist interception, and support specialized vegetation including stunted trees and rich epiphytic growths (mosses and lichens).

Step-by-Step Solution

1
Analyze atmospheric and climatic shifts along an altitudinal gradient in terrestrial biomes
As altitude increases, atmospheric pressure and temperature decrease (environmental lapse rate), while moisture condensation produces frequent mist/cloud cover, increasing relative humidity.
Temperature and humidity gradients strongly dictate the vegetative profile of montane environments compared to lowland savannas.
2
Evaluate morphological adaptations of flora in high-altitude montane biomes versus lowland savannas
Strong winds, cooler temperatures, and high moisture levels in montane zones result in stunted or dwarf tree growth (elfin forest characteristics) covered with epiphytic bryophytes and lichens.
Epiphytic mosses and lichens thrive in cool, persistently humid air, whereas lowland trees adapt to seasonal drought and bushfires.

Key Concept

Montane Biome Abiotic Factors and Flora Adaptations
Estimated Time:2m 0s
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Topics

Biomes and Aquatic/Terrestrial Habitats

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