Biodiversity and threats — A/L Biology

How do I practise Biodiversity and threats?

1 question with a worked solution

1. Which aggressive invasive alien woody plant species severely degrades native vegetation and coastal wetlands in the arid zones of Sri Lanka, notably in Bundala National Park?
   1. A) Salvinia molesta
   2. B) Prosopis juliflora (Kalapu andara)
   3. C) Eichhornia crassipes (Japan jabara)
   4. D) Parthenium hysterophorus
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   Correct answer: B) Prosopis juliflora (Kalapu andara)

   Prosopis juliflora (Mesquite / Kalapu andara) is a thorny drought-resistant shrub/tree native to Central America. Introduced to the Hambantota district, it aggressively colonized lagoons and sand dunes of Bundala National Park, forming impenetrable monocultures that outcompete native scrub.

   Show worked solution

   Step 1: Classify invasive species habitats: - Eichhornia & Salvinia: aquatic floating weeds. - Parthenium: agricultural and roadside herbaceous weed. - Prosopis juliflora: arid-zone woody thorny shrub invading Bundala. Answer: Prosopis juliflora (Kalapu andara).
   Modelled on: the A/L Biology examination pattern

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Where does Biodiversity and threats fit in the syllabus?

Year 2 · Term 2