A genetically engineered form of brinjal, known as the Bt-brinjal, has been developed. The objective of this is
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- ATo make it pest-resistant
- BTo improve its taste and nutritive qualities
- CTo make it drought-resistant
- DTo make its shelf-life longer
Show answer
Answer: (A) To make it pest-resistant
The answer is (a) — Bt brinjal was developed to make it PEST-RESISTANT.
'Bt' stands for Bacillus thuringiensis — a soil bacterium that naturally produces a protein (Cry1Ac) toxic to certain insect pests (especially the fruit and shoot borer, which destroys 50-70% of brinjal crop in India).
How it works:
Scientists inserted the Cry1Ac gene from Bt bacteria into the brinjal plant's DNA.
When insect larvae eat the Bt brinjal, the Cry protein destroys their gut lining → the insect dies.
The plant itself is not affected, and the protein is harmless to humans.
Benefits:
- Reduces pesticide use by 80%
- Increases yield
- Lowers farming costs
Controversy:
India placed a MORATORIUM on Bt brinjal in 2010 (by Environment Minister Jairam Ramesh) due to concerns about biosafety, biodiversity, and health impacts.
It remains banned for commercial cultivation in India, though Bangladesh has approved it.
Why not other options?
- (b) Not about taste/nutrition improvement.
- (c) Not about drought resistance.
- (d) Not about shelf life.
The Bt technology is specifically about INSECT RESISTANCE.
Bt brinjal contains a gene from Bacillus thuringiensis bacteria that produces a protein toxic to insect pests, specifically targeting the fruit and shoot borer which destroys 50-70% of brinjal crops in India.
In 2010, Environment Minister Jairam Ramesh imposed a moratorium on Bt brinjal in India due to biosafety concerns, making it a significant policy issue that UPSC would test.
The question tests understanding of genetic modification objectives - Bt technology is always about pest resistance, not improving taste, nutrition, drought tolerance, or shelf life.
Bt Brinjal: India's Controversial GM Crop
Science And Technology Bt-brinjal genetically engineered pest-resistant
Bt Brinjal: Development, Benefits & India's Moratorium
Bt brinjal is genetically engineered for pest resistance, not taste, nutrition, drought, or shelf-life
Uses Cry1Ac gene from Bacillus thuringiensis bacteria to kill insect pests
India placed moratorium in 2010 by Environment Minister Jairam Ramesh
Targets fruit and shoot borer which destroys 50-70% of brinjal crop in India
Bt brinjal is India's first genetically modified food crop, developed by Mahyco (in partnership with Monsanto) to combat devastating pest attacks. The 'Bt' stands for Bacillus thuringiensis, a soil bacterium that naturally produces insect-killing proteins.
How Bt Technology Works
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**Gene Isolation**
**Cry1Ac gene** extracted from **Bacillus thuringiensis** bacteria`"]
s2["`**Gene Insertion**
Cry1Ac gene inserted into **brinjal plant DNA** using genetic engineering`"]
s3["`**Protein Production**
Modified brinjal plant produces **Cry protein** in all its tissues`"]
s4["`**Pest Control**
When **insect larvae** eat the plant, Cry protein **destroys their gut lining** → insect dies`"]
s1 --> s2
s2 --> s3
s3 --> s4Bt Brinjal: Benefits vs Concerns
Aspect | Benefits Claimed | Concerns Raised |
|---|---|---|
Pesticide Use | 80% reduction in chemical pesticides | Potential resistance development in pests |
Farmer Economics | Higher yields, lower input costs | Seed dependency on corporations |
Health Impact | Safe for humans - Cry protein harmless | Long-term effects unknown |
Biodiversity | Less chemical pollution | Impact on non-target species unclear |
Food Security | 50-70% crop loss prevention | Genetic contamination of native varieties |
India's Bt Brinjal Timeline
2000-2006: Development and field trials by Mahyco-Monsanto partnership
2009: GEAC (Genetic Engineering Appraisal Committee) approves Bt brinjal for cultivation
February 2010: Environment Minister Jairam Ramesh places indefinite moratorium
2013: Bangladesh approves Bt brinjal - becomes first South Asian country to cultivate it
Present: Moratorium continues in India despite industry pressure for approval
Question Context
This 2011 UPSC question tests the specific objective of Bt brinjal development. The correct answer (A) pest resistance reflects the core Bt technology purpose. Options B, C, D represent different genetic modifications - taste/nutrition enhancement, drought tolerance, and extended shelf-life require entirely different genes and techniques.
Trap: Confusing Bt technology with drought resistance - Bt targets insects, not water stress
Trap: Assuming GM crops automatically improve taste/nutrition - that requires different genetic modifications
Trap: Mixing up shelf-life extension with pest resistance - these are separate biotechnology applications
Memory aid: Bt = Bug Terminator - always about insect/pest control, nothing else
Bacillus Thuringiensis: Natural Biopesticide
Science And Technology Bacillus thuringiensis
Bacillus Thuringiensis: The Bacterial Source of Bt Technology
Bacillus thuringiensis is a soil bacterium that naturally produces insect-killing proteins
Produces Cry proteins (Crystal proteins) toxic to specific insect larvae
Used in organic farming as natural biopesticide for decades before genetic engineering
Bacillus thuringiensis (Bt) is a gram-positive, spore-forming soil bacterium discovered in 1901. It naturally produces crystal proteins (Cry proteins) during sporulation that are highly toxic to specific insect orders but completely harmless to humans, mammals, and most beneficial insects.
Major Cry Proteins & Target Pests
Cry Protein | Target Insect Order | Crop Application | Example Pests |
|---|---|---|---|
Cry1Ac | Lepidoptera | Cotton, Brinjal | Bollworm, Fruit & shoot borer |
Cry1Ab | Lepidoptera | Corn | European corn borer |
Cry3A | Coleoptera | Potato | Colorado potato beetle |
Cry4A | Diptera | Public health | Mosquito larvae |
Bt as Natural Biopesticide
Organic approved: Used in organic farming since 1920s as spray formulation
Selective toxicity: Affects only insects with alkaline gut pH (8-10), not mammals (acidic pH 1-2)
Mode of action: Cry proteins bind to specific receptors in insect gut → cell lysis → death
Environmental safety: Biodegradable, no bioaccumulation in food chains
Commercial production: Fermented in bioreactors, formulated as wettable powders or liquids
Bt Applications in Agriculture
# Bacillus thuringiensis
## Traditional Use
- Spray formulations
- Organic farming
- Biopesticide
## Genetic Engineering
- Bt cotton
- Bt corn
- Bt brinjal
- Bt mustard
## Public Health
- Mosquito control
- Black fly control
- Gnat larvaeTrap: Thinking Bt is artificially created - it's a natural soil bacterium used for 100+ years
Trap: Assuming Bt affects all insects equally - Cry proteins are highly specific to insect orders
Trap: Confusing Bt spray (traditional) with Bt crops (genetic engineering) - both use same bacteria, different delivery
GM Crop Regulation in India
Science And Technology
GM Crop Regulation & Approval Process in India
GEAC (Genetic Engineering Appraisal Committee) is India's apex body for GM crop approval
Only Bt cotton is approved for commercial cultivation in India currently
Environment Ministry has final authority - can override GEAC recommendations
India follows a multi-tier regulatory framework for GM crops under the Environment Protection Act, 1986. The process involves multiple agencies ensuring biosafety, environmental impact assessment, and socio-economic considerations before any GM crop reaches farmers' fields.
GM Crop Approval Process
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**Laboratory Testing**
**Institutional Biosafety Committee (IBSC)** approves contained research`"]
s2["`**Contained Field Trials**
**Review Committee on Genetic Manipulation (RCGM)** permits controlled testing`"]
s3["`**Open Field Trials**
**GEAC** approval required for multi-location field testing`"]
s4["`**Commercial Release**
**GEAC recommendation** → **Environment Minister** final decision`"]
s1 --> s2
s2 --> s3
s3 --> s4Key Regulatory Bodies
Body | Full Form | Role | Ministry |
|---|---|---|---|
GEAC | Genetic Engineering Appraisal Committee | Apex approval body for GM crops | Environment & Forests |
RCGM | Review Committee on Genetic Manipulation | Monitors R&D, permits field trials | Science & Technology |
IBSC | Institutional Biosafety Committee | Lab-level safety oversight | Individual Institutions |
SSAC | State-level Standing Committee | State government consultation | State Governments |
Current Status in India
Bt cotton: Only GM crop approved for cultivation (2002) - covers 95% of cotton area
Bt brinjal: GEAC approved (2009) but Environment Minister imposed moratorium (2010)
Bt mustard: Under consideration - Supreme Court cases pending on approval
GM food crops: No food crop approved for cultivation despite multiple applications
Import allowed: GM soybean oil, canola oil imported for food use (not cultivation)
Trap: Assuming GEAC approval = automatic cultivation - Environment Minister can impose moratorium
Trap: Thinking India has banned all GM crops - Bt cotton is widely cultivated
Trap: Confusing GM food import (allowed) with GM food cultivation (not approved for any crop)
Genetic Engineering in Agriculture
Science And Technology genetically engineered
Genetic Engineering Applications in Crop Improvement
Genetic engineering creates transgenic crops with traits impossible through traditional breeding
Major applications: pest resistance, herbicide tolerance, disease resistance, nutritional enhancement
Different from conventional breeding - can transfer genes across species barriers
Genetic engineering allows scientists to introduce specific genes from any organism into crops, creating combinations impossible through natural breeding. This precision biotechnology addresses agricultural challenges like pest damage, diseases, environmental stress, and nutritional deficiencies.
Major GM Crop Applications
Application | Gene Source | Examples | Global Status |
|---|---|---|---|
Pest Resistance | Bacillus thuringiensis bacteria | Bt cotton, Bt corn, Bt brinjal | Most widely adopted |
Herbicide Tolerance | Modified plant enzymes | Roundup Ready soybean/cotton | Second most common |
Disease Resistance | Virus proteins, plant genes | Papaya ringspot virus resistant papaya | Limited commercial use |
Nutritional Enhancement | Multiple sources | Golden Rice (Vitamin A), Iron-rich beans | Research stage mostly |
Environmental Stress | Stress-tolerance genes | Drought-tolerant corn, Salt-tolerant rice | Emerging applications |
Traits Enhanced by Genetic Engineering
# GM Crop Applications
## Biotic Stress
- Insect pests
- Fungal diseases
- Viral diseases
- Bacterial diseases
## Abiotic Stress
- Drought tolerance
- Salt tolerance
- Heat tolerance
- Cold tolerance
## Quality Traits
- Nutritional content
- Shelf life
- Processing quality
- Taste improvement
## Agronomic Traits
- Herbicide tolerance
- Growth rate
- Yield potential
- Maturity periodGlobal GM Crop Adoption
Leading crops: Soybean (78% GM globally), Cotton (80%), Corn (30%), Canola (30%)
Top countries: USA, Brazil, Argentina, India, Canada grow 90% of global GM crops
Farmer adoption: 17 million farmers in 26 countries cultivate GM crops (2019 data)
Economic impact: US$ 225 billion additional revenue to farmers (1996-2018)
Pesticide reduction: 8.6% decrease in pesticide use globally due to GM crops
Trap: Assuming genetic engineering only creates pest resistance - it addresses multiple agricultural challenges
Trap: Confusing genetic modification with hybrid breeding - GM crosses species barriers, hybrids don't
Trap: Thinking all GM crops use same technique - different applications require different genetic approaches