Why is a plant called Prosopis juliflora often mentioned in news?
Contents16
- AIts extract is widely used in cosmetics.
- BIt tends to reduce the biodiversity in the area in which it grows.
- CIts extract is used in the synthesis of pesticides.
- DNone of these
Show answer
Answer: (B) It tends to reduce the biodiversity in the area in which it grows.
Correct Answer: (b) It tends to reduce the biodiversity in the area in which it grows.
Prosopis juliflora is an INVASIVE species — one of the worst in India. Here's why it makes news:
- It was originally brought to India from South and Central America to provide fuel wood for rural communities and to restore degraded/barren lands.
- BUT it spread uncontrollably and became a major problem. It grows aggressively, takes over large areas, and chokes out native plants.
- It reduces biodiversity by outcompeting local plant species for water, sunlight, and nutrients.
- It threatens local ecosystems, agricultural lands, and pasture lands.
Why the other options are wrong:
- Option A: Its extract is NOT widely used in cosmetics.
- Option C: Its extract is NOT used for making pesticides.
REMEMBER: Prosopis juliflora = invasive species = reduces biodiversity. Brought to India with good intentions (fuel wood, land restoration) but became a menace. It's a classic example of how introducing a foreign species can backfire. UPSC loves questions about invasive species!
Prosopis juliflora is one of India's worst invasive species, originally introduced for fuel wood but now threatening native ecosystems by outcompeting local plants.
Invasive species management became a major policy focus after India's Biological Diversity Act implementation, making species like Prosopis juliflora frequently appear in environmental news.
The question tests whether students can distinguish between beneficial uses of plants versus their ecological impact as invasive species.
Prosopis juliflora
Environment Prosopis juliflora
Prosopis juliflora: India's Most Notorious Invasive Plant
Quick Facts
Prosopis juliflora is an invasive species from South/Central America that reduces biodiversity
Originally introduced to provide fuel wood and restore degraded lands
Spreads aggressively and outcompetes native plants for resources
Threatens agricultural lands, pastures, and local ecosystems
Why It Makes News
Prosopis juliflora is a classic case of good intentions gone wrong. Brought to India from South and Central America to solve fuel shortage and restore barren lands, it became one of India's worst ecological threats.
Problem Profile
Aspect | Details | Impact |
|---|---|---|
Growth Pattern | Aggressive, fast-spreading | Takes over large areas quickly |
Resource Competition | High water and nutrient demand | Starves native plants |
Reproduction | Prolific seed production | Difficult to control once established |
Habitat Impact | Dense thickets formation | Blocks sunlight for other species |
Biodiversity Impact
Monoculture formation - creates single-species stands that eliminate plant diversity
Allelopathy - releases chemicals that inhibit growth of other plants
Habitat modification - changes soil chemistry and water availability
Wildlife disruption - reduces food sources and nesting sites for native animals
Question Connection
The question tests knowledge of why Prosopis juliflora appears in environmental news. The correct answer (Option B) reflects its primary threat - biodiversity reduction. Options A and C about cosmetics and pesticides are distractors with no factual basis.
Trap: Don't confuse Prosopis juliflora with beneficial native species - it's a harmful invasive plant
Trap: Remember it was introduced with good intentions (fuel wood, land restoration) but became problematic
Trap: Focus on biodiversity reduction as its main news-worthy impact, not commercial uses
Invasive Species in India
Environment
Invasive Species: Major Threats to Indian Biodiversity
Key Concepts
Invasive species are non-native organisms that spread rapidly and harm ecosystems
They outcompete native species for resources, reducing biodiversity
Often introduced accidentally or intentionally by humans
Major economic and ecological threat requiring urgent management
Definition & Mechanism
Invasive species are non-native organisms that establish, spread, and cause ecological or economic harm in new environments. They succeed because they often lack natural predators in their new habitat and can exploit resources more efficiently than native species.
Major Plant Invaders in India
Species | Origin | Primary Impact | Affected Areas |
|---|---|---|---|
Prosopis juliflora | South/Central America | Biodiversity loss, agricultural damage | Rajasthan, Gujarat, Tamil Nadu |
Lantana camara | Central/South America | Forest understory invasion | Western Ghats, forests nationwide |
Parthenium hysterophorus | North/Central America | Crop damage, health issues | Agricultural areas, roadsides |
Eichhornia crassipes (Water Hyacinth) | Amazon Basin | Water body clogging | Rivers, lakes, wetlands |
Mikania micrantha | Central America | Smothers native vegetation | Northeast India, Western Ghats |
Invasion Pathways
# How Species Invade
## Intentional Introduction
- Ornamental plants
- Timber species
- Soil restoration
- Fuel wood
## Accidental Introduction
- Ship ballast water
- Cargo contamination
- Tourist luggage
- Natural dispersal
## Establishment Factors
- Lack of predators
- Climate suitability
- Resource availability
- High reproduction rateTrap: Native vs exotic vs invasive - not all exotic species are invasive, only those that spread and cause harm
Trap: Don't assume all intentionally introduced species are bad - many remain contained and beneficial
Trap: Prosopis juliflora is the most UPSC-relevant invasive plant - know its specific impacts
Biodiversity Loss & Conservation
Environment biodiversity
Biodiversity Loss: Causes, Impacts & Conservation in India
Core Facts
Biodiversity refers to variety of life at genetic, species, and ecosystem levels
India is a biodiversity hotspot with high species richness and endemism
Major threats include habitat loss, invasive species, pollution, climate change
Conservation through protected areas, ex-situ conservation, legal frameworks
India's Biodiversity Significance
India harbors 8% of global biodiversity despite covering only 2.4% of world's land area. It has 4 biodiversity hotspots and is home to numerous endemic species, making biodiversity conservation crucial for both national and global ecological security.
Major Threats to Biodiversity
Threat | Mechanism | Examples in India | Impact Level |
|---|---|---|---|
Habitat Loss | Deforestation, urbanization | Amazon deforestation, urban sprawl | Very High |
Invasive Species | Outcompete natives | Prosopis juliflora, Lantana camara | High |
Pollution | Toxic contamination | Industrial effluents, pesticides | High |
Overexploitation | Unsustainable harvesting | Overfishing, poaching | Medium-High |
Climate Change | Altered weather patterns | Coral bleaching, range shifts | Increasing |
Conservation Strategies
# Biodiversity Conservation
## In-Situ Conservation
- National Parks
- Wildlife Sanctuaries
- Biosphere Reserves
- Community Reserves
## Ex-Situ Conservation
- Botanical Gardens
- Zoos
- Gene Banks
- Seed Banks
## Legal Framework
- Wildlife Protection Act
- Forest Conservation Act
- Biodiversity Act 2002
- CITES
## International Initiatives
- CBD
- Ramsar Convention
- IUCN Red List
- Nagoya ProtocolTrap: Biodiversity hotspots are areas with high endemism AND habitat loss - not just species richness
Trap: In-situ vs Ex-situ conservation - know which strategy applies where
Trap: Invasive species reduce biodiversity by competition, not just by being non-native