1. How did the invasive tree Senna spectabilis enter Wayanad Wildlife Sanctuary?
Explanation: Senna spectabilis, brought to Wayanad for shade in the mid-80s, entered the Wayanad Wildlife Sanctuary and established itself over a large part of it over a few decades.
2. What are the consequences of Senna spectabilis spreading in the Western and Eastern Ghats?
Explanation: Senna has spread across protected areas in the Western and Eastern Ghats in three south Indian states, leading to a decline in native biodiversity.
3. How is the spread of Senna being managed in affected areas?
Explanation: Various attempts are underway to manage the further spread of Senna. Methods include cutting, debarking, and chemical treatments.
4. What decision did the Kerala forest department make in 1986 regarding Senna spectabilis?
Explanation: In 1986, the Kerala forest department’s social forestry wing planted Senna spectabilis saplings in the Wayanad Wildlife Sanctuary and along roads in Muthanga and Tholpetty areas, unaware of its invasive nature.
5. What is the origin and global background of Senna spectabilis?
Explanation: Senna spectabilis, of tropical American origin, has a notorious history of colonizing continents, including parts of Asia, Africa, and Australia.
6. How has the spread of Senna impacted native biodiversity in the affected regions?
Explanation: The spread of Senna in the Western and Eastern Ghats has resulted in a decline in native biodiversity in the affected areas.
SRIRAM’s
