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Answer: 2. *Parthenium hysterophorus*—Threat to biodiversity

Parthenium hysterophorus (carrot grass) is an invasive weed that threatens native biodiversity, so option 2 is correct.

  • Age pyramid belongs to population, not biome.
  • Stratification belongs to a community, not a population.
  • Aerenchyma is in hydrophytes; Opuntia is a xerophyte.
Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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