For aspirants preparing for competitive exams like IAS, SSC, RRB, and Bank Exams, understanding environmental issues and biodiversity conservation is crucial for both General Studies (GS) and Current Affairs sections.
In this blog, we focus on two important topics:
🌱 Parthenium hysterophorus (Congress Grass) – a major invasive weed in India
🦏 Pobitora Wildlife Sanctuary – important for rhinoceros conservation in Assam
🌿 Parthenium (Congress Grass) – Key Facts
📚 Scientific Classification
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Scientific Name: Parthenium hysterophorus L.
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Family: Asteraceae (Compositae)
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Common Names in India:
✔️ Carrot weed
✔️ White top
✔️ Congress Grass
✔️ Gajar Ghas
⚠️ Nature & Threats
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Poisonous, allergenic, and invasive annual herb
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Causes:
✔️ Dermatitis, asthma, nasal-dermal and nasal-bronchial allergies in humans
✔️ Toxicity to livestock
✔️ Reduces crop yield, blocks drainage, degrades pasture land, lowers aesthetic value in parks/gardens
🌏 Origin & Spread in India
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Originated from:
✔️ Mexico
✔️ Trinidad
✔️ Argentina
✔️ USA -
First reported in India: Pune, 1955
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Currently covers approx. 35 million hectares across India
🌱 Reproduction
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Each plant produces 5,000–25,000 seeds
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Seeds are small and lightweight → Spread easily by wind and water
🌳 Pobitora Wildlife Sanctuary – Key Facts
📍 Location
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Morigaon district, Assam (East of Guwahati)
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Area: 48.81 sq km
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Established in 1998
🌿 Flora
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72% wet savannah vegetation (Arundo donax, Erianthus ravennae, Phragmites karka, Imperata cylindrica, Saccharum spp.)
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Water hyacinth (Eichornia crassipes) – Major invasive species problem in wetlands
🐘 Fauna
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Holds the highest density of Greater One-horned Rhinoceros in India
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Other species include:
✔️ Leopard
✔️ Wild boar
✔️ Barking deer
✔️ Wild buffalo
✔️ Over 2000 migratory bird species
✔️ Reptiles
✅ UPSC – Prelims Practice Questions
Q1. Parthenium hysterophorus, often seen in news, is:
(a) A medicinal plant found in Himalayan regions
(b) An invasive alien weed harmful to humans and livestock
(c) A genetically modified crop for biofuel production
(d) A grass species used for soil conservation
👉 Answer: (b)
Q2. Which of the following statements about Pobitora Wildlife Sanctuary is/are correct?
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It has the highest population density of Greater One-horned Rhinoceros in India.
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It is located in Assam’s Morigaon district.
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It is part of the Kaziranga National Park landscape.
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
👉 Answer: (a)
Q3. Invasive alien species in India include:
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Parthenium hysterophorus
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Lantana camara
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Prosopis juliflora
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
👉 Answer: (d)
📝 UPSC – Mains Practice Questions
GS3 – Environment & Ecology
Q1. Discuss the ecological and economic impacts of invasive alien plant species in India, with special reference to Parthenium hysterophorus. Suggest suitable management strategies.
GS3 – Biodiversity Conservation
Q2. Pobitora Wildlife Sanctuary holds the highest density of Greater One-horned Rhinoceros in India.
Explain the ecological significance of such sanctuaries in species-specific conservation and the challenges they face.
🌟 Why This Topic Is Important for Government Exams
Topics related to environment & biodiversity conservation are frequently asked in exams such as IAS, SSC CGL, and RRB.
👉 Sample Question:
“What are the challenges posed by invasive species in India and how can they be managed effectively?”
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✅ Conclusion
Understanding Parthenium hysterophorus and Pobitora Wildlife Sanctuary is critical for aspirants aiming to crack government exams. These topics cover environmental degradation, biodiversity conservation, and the challenges India faces.
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