Which biome is characterized by broadleaf trees that undergo seasonal leaf abscission (shedding) in autumn to survive freezing winter temperatures, common across Eastern North America, Western Europe, and East Asia?
Answer and explanation
Correct answer: C. Temperate Deciduous Forest
- Step 1: Broadleaf deciduous trees face freezing winter conditions where water in topsoil freezes, creating physiological drought and risks of frozen sap in broad leaves.
- Step 2: In Temperate Deciduous Forests, species like oaks, maples, and beeches dismantle chlorophyll pigments (revealing yellow carotenoids and red anthocyanins) and form abscission cork layers to shed leaves, entering dormancy until spring.
Answer
Temperate Deciduous Forest
Why not the others: 'Taiga' The taiga is dominated by needle-bearing coniferous evergreens that retain their foliage throughout winter freezes; 'Tropical Dry Forest' Tropical dry forests shed their leaves in response to severe seasonal drought rather than cold winter temperatures; 'Chaparral' The chaparral consists of sclerophyllous evergreen shrubs adapted to hot, dry Mediterranean summers.
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