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Difficulty: MediumBiomes and Aquatic/Terrestrial Habitats

Plants growing in the Tropical Rainforest biome face intense competition for light in the dense canopy layer, whereas plants in the Sahel Savanna face extreme water scarcity and high evapotranspiration rates. Which combination of structural adaptations correctly distinguishes tropical rainforest trees from Sahel savanna shrubs?

  1. Broad leaves with drip tips and buttress roots in rainforest plants; reduced needle-like or thorny leaves and deep taproot systems in savanna plants.Answer
  2. B
    Pneumatophores and salt-excreting glands in rainforest plants; succulent stems with broad deciduous leaves in savanna plants.
  3. C
    Deep taproot systems with needle-like leaves in rainforest plants; buttress roots with broad leaves in savanna plants.
  4. D
    Broad leaves with prop roots in rainforest plants; pioneer mosses and lichen crusts lacking vascular tissue in savanna plants.

Answer

Broad leaves with drip tips and buttress roots in rainforest plants; reduced needle-like or thorny leaves and deep taproot systems in savanna plants.
Tropical rainforest trees inhabit humid, high-rainfall environments where light is limiting near the forest floor and soils are shallow; thus, they possess broad leaves with drip tips (to prevent leaf rotting and fungal growth) and massive buttress roots for physical support. Conversely, Sahel savanna vegetation faces severe drought and intense evapotranspiration, favoring xerophytic adaptations like reduced leaf surface area (thorns/spines) to minimize water loss and long taproots to draw water from deep subterranean layers.

Step-by-Step Solution

1
Analyze the environmental constraints of the Tropical Rainforest biome.
High rainfall, high humidity, and dense canopy require structural adaptations such as broad photosynthetic leaves to capture low light under the canopy, drip tips to quickly shed water off leaf surfaces, and tall trunks supported by buttress roots in nutrient-poor shallow soils.
Rainforest plants prioritize light capture, rapid water drainage from leaves, and physical stability.
2
Analyze the environmental constraints of the Sahel Savanna biome.
Low rainfall, prolonged dry seasons, and high temperatures require xeromorphic adaptations such as reduced leaf surface area (spines/thorns/thickets) to restrict transpiration losses, thick cuticles, and extensive deep taproot systems to access deep groundwater reserves.
Savanna plants prioritize water conservation and deep moisture absorption.
3
Select the option that correctly contrasts these two distinct biome profiles.
The option specifying broad leaves with drip tips and buttress roots for rainforest plants paired with reduced/thorny leaves and deep taproots for savanna plants is correct.
This accurately reflects the morphological adaptations demanded by the respective abiotic conditions of each biome.

Key Concept

Morphological Adaptations to Terrestrial Biomes
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Topics

Biomes and Aquatic/Terrestrial Habitats

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