The American multinational company, Monsanto has produced an insect-resistant cotton variety that is undergoing field- trails in India. A toxin gene from which ONE of the following bacteria has been transferred to this transgenic cotton ?

1. Basics of Recombinant DNA (rDNA) Technology (basic)

To understand Recombinant DNA (rDNA) technology, we must first look at the blueprint of life: DNA. Every living cell contains DNA, which serves as an information source for making proteins. A specific section of this DNA that provides the instructions for one particular protein is called a gene Science, class X (NCERT 2025 ed.), Heredity, p.131. These proteins, in turn, act as enzymes or structural components that control the characteristics or traits of an organism—such as the height of a plant or the color of a flower Science, class X (NCERT 2025 ed.), Heredity, p.131.

In nature, variations in DNA occur during reproduction through biochemical reactions that aren't always 100% accurate Science, class X (NCERT 2025 ed.), How do Organisms Reproduce?, p.114. While sexual reproduction naturally combines variations from two individuals to create new traits, Recombinant DNA technology is a more precise, laboratory-based method. Instead of waiting for generations of breeding, scientists can "cut" a specific gene from one organism and "paste" it into the DNA of another. This results in a chimeric or "recombinant" DNA molecule that contains genetic material from two different sources.

The process functions much like a surgical "cut-and-paste" operation using molecular tools:

• Restriction Enzymes: These act as "molecular scissors" that cut DNA at specific sequences.
• DNA Ligase: This acts as "molecular glue" to join the new gene into the host's DNA.
• Vectors: These are delivery vehicles (like plasmids or viruses) used to carry the new DNA into the target cell.

By inserting a specific gene, we can force the host organism to produce a protein it never could before. For instance, if we insert a gene that codes for a specific toxin into a plant's DNA, that plant will now produce that protein to protect itself from pests. This bypasses the limitations of traditional breeding, allowing us to combine variations that would never meet in nature Science, class X (NCERT 2025 ed.), How do Organisms Reproduce?, p.119.

Sources: Science, class X (NCERT 2025 ed.), Heredity, p.131; Science, class X (NCERT 2025 ed.), How do Organisms Reproduce?, p.114; Science, class X (NCERT 2025 ed.), How do Organisms Reproduce?, p.119

2. Introduction to Genetically Modified Organisms (GMOs) (basic)

To understand Genetically Modified Organisms (GMOs), we first need to look at the "instruction manual" of life: DNA (Deoxyribonucleic acid). Every living being—whether it is a plant, an animal, or a tiny bacterium—carries DNA that determines its traits, like the color of a flower or the height of a person. In nature, these traits change slowly through natural recombination or mating.

A GMO, however, is an organism where this hereditary material has been altered artificially. According to the World Health Organization (WHO), GMOs are organisms in which the DNA has been changed in a way that does not occur naturally by mating or regular recombination Indian Economy, Nitin Singhania (ed 2nd 2021-22), Agriculture, p.301. This process is often called modern biotechnology or gene technology. When scientists take a specific gene from one organism (like a bacterium) and insert it into another (like a cotton plant) to give it a new trait, that inserted gene is called a transgene.

It is important to distinguish GMOs from traditional breeding. For centuries, farmers have used "selective breeding" or "cross-breeding" to improve crops and livestock—for example, crossing two different breeds of goats to improve milk yield Geography of India, Majid Husain (McGrawHill 9th ed.), Resources, p.36. The key difference is that traditional breeding relies on natural reproduction between related species, whereas genetic modification allows scientists to move genes between completely unrelated species in a laboratory setting.

Feature	Traditional Selective Breeding	Genetic Modification (GMO)
Mechanism	Natural mating/pollination between related species.	Artificial insertion of specific genes in a lab.
Precision	Mixes many genes at once; less predictable.	Targets specific, individual genes.
Source of Genes	Limited to the same or very closely related species.	Can use genes from any organism (bacteria, animals, plants).

Sources: Indian Economy, Nitin Singhania (ed 2nd 2021-22), Agriculture, p.301; Geography of India, Majid Husain (McGrawHill 9th ed.), Resources, p.36

3. Biotechnology Applications in Agriculture (intermediate)

To understand Bt Cotton, we must first look at the 'Bt' itself. It stands for Bacillus thuringiensis, a common soil bacterium that naturally produces proteins toxic to certain insects. In biotechnology, scientists 'spliced' or inserted specific genes from this bacterium—most notably the cry1Ac gene—into the DNA of the cotton plant. This transformation allows the plant to produce its own internal insecticide, specifically targeting lepidopteran pests like the devastating bollworm. When a larvae feeds on the plant, the Cry toxin is activated in its alkaline gut, leading to the pest's death. This reduces the need for external chemical sprays, which aligns with the broader goal of minimizing pesticide use in modern farming Indian Economy, Agriculture - Part II, p.354. In the Indian context, Bt cotton holds a unique position as the only GM crop currently permitted for commercial cultivation. It was officially introduced in 2002 through a collaboration between the Indian company Mahyco and the global firm Monsanto Indian Economy, Agriculture - Part II, p.342. The adoption was rapid because it addressed a primary 'biotic stress'—pest infestation—that previously decimated yields. Today, cotton is a major cash crop for India, with Gujarat leading the nation in production, followed closely by states like Telangana and Maharashtra INDIA PEOPLE AND ECONOMY, Geographical Perspective on Selected Issues and Problems, p.113. From a regulatory standpoint, the development and release of such crops are not left to chance. The Genetic Engineering Appraisal Committee (GEAC), functioning under the Ministry of Environment, Forest and Climate Change, serves as the apex body that evaluates the safety and efficacy of GM events before they reach the farmer's field Indian Economy, Agriculture - Part II, p.342. This ensures that while we pursue higher yields and lower costs, we also maintain environmental and biological safeguards.

Sources: Indian Economy, Agriculture - Part II, p.342; Indian Economy, Agriculture - Part II, p.354; INDIA PEOPLE AND ECONOMY, Geographical Perspective on Selected Issues and Problems, p.113

4. Regulatory Framework for GM Crops in India (exam-level)

In India, the regulation of Genetically Modified (GM) crops is not handled by the Ministry of Agriculture alone, but primarily falls under the Ministry of Environment, Forest and Climate Change (MoEFCC). This is because GM crops are treated as potential environmental risks. The legal backbone for this regulation is the Environment (Protection) Act (EPA), 1986 Environment and Ecology, Majid Hussain (Access publishing 3rd ed.), Major Crops and Cropping Patterns in India, p.88. Under this Act, the Genetic Engineering Appraisal Committee (GEAC) functions as the apex body responsible for appraising activities involving the large-scale use of hazardous microorganisms and recombinants in research and industrial production.
The GEAC's role is critical: it evaluates proposals for the environmental release of GM crops, including field trials and commercial cultivation. However, it is important to understand that a 'yes' from the GEAC does not automatically mean a crop hits the market. The committee provides a technical recommendation, but the final policy decision rests with the Central Government Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.343. This distinction is vital for the exam, as seen in the case of Bt Brinjal; despite GEAC approval in 2007, the government imposed an indefinite moratorium in 2010 due to public and scientific concerns Indian Economy, Nitin Singhania (ed 2nd 2021-22), Agriculture, p.302.
Currently, India's regulatory landscape for GM crops looks like this:

Crop Status	Details
Bt Cotton	The only GM crop currently allowed for commercial cultivation in India (since 2002) Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.342.
DMH-11 (Mustard)	Recommended for environmental release by GEAC in Oct 2022; it would be India's first GM food crop if fully cleared Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.343.
Bt Brinjal	Recommended by GEAC in 2007 but blocked/moratorium by the government in 2010.

Beyond the GEAC, there has been a long-standing proposal to streamline this process through the Biotechnology Regulatory Authority of India (BRAI) Bill, which seeks to create a single-window scientific regulator, though it has faced delays in Parliament for years Indian Economy, Nitin Singhania (ed 2nd 2021-22), Agriculture, p.302.

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.342-343; Indian Economy, Nitin Singhania (ed 2nd 2021-22), Agriculture, p.302; Environment and Ecology, Majid Hussain (Access publishing 3rd ed.), Major Crops and Cropping Patterns in India, p.88

5. Intellectual Property Rights and Bio-piracy (intermediate)

When we talk about Genetically Modified (GM) crops, we aren't just talking about biology; we are talking about Intellectual Property Rights (IPR). Developing a GM trait, like the insect-resistant Bt technology, involves years of expensive research. Companies seek to recover these costs through patents, which grant them exclusive rights to their invention. At a global level, the WTO’s TRIPS Agreement (Trade-Related Aspects of Intellectual Property Rights) mandates that member nations provide a standardized level of protection for such innovations Indian Economy, Vivek Singh (7th ed. 2023-24), International Organizations, p.388. However, TRIPS also allows countries to impose "reasonable restrictions" to protect public interest, which is where the Indian legal landscape becomes unique Indian Economy, Vivek Singh (7th ed. 2023-24), International Organizations, p.389.

In India, there is a fascinating legal tension between the Patents Act, 1970 and the Protection of Plant Varieties and Farmers' Rights (PPVFR) Act, 2001. Under Section 3(j) of the Indian Patents Act, seeds, plants, and biological processes are explicitly not patentable. This led to a major legal battle involving Monsanto. The company argued that while the seed itself isn't patentable, the man-made gene sequence (like the Bt gene) inserted into it is a biotech invention and should be protected, much like software on a CD Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.343. Conversely, the Indian government and local seed companies argue that once a gene is part of a plant, it becomes a "variety," which falls under the PPVFR Act rather than patent law.

The PPVFR Act is India's way of balancing the rights of breeders with the rights of farmers. It acknowledges that farmers are not just consumers of seeds but also conservators of genetic resources. If a farmer conserves wild relatives of plants that are later used to develop new GM varieties, they are entitled to recognition and rewards from a National Gene Fund Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.344. This prevents bio-piracy—the practice where commercial entities use indigenous biological resources without permission or fair compensation.

Right Holder	Rights under PPVFR Act, 2001	Key Restriction
Breeder/Company	Exclusive right to produce and sell the protected variety.	Cannot prevent farmers from traditional seed-saving.
Farmer	Can save, use, sow, re-sow, exchange, or share seeds.	Cannot sell branded (packaged) seeds of a protected variety Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.345.

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), International Organizations, p.388-389; Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.343-345

6. The Mechanism of Bt Technology (exam-level)

To understand Bt Technology, we must first look at how cells function. Every cell uses DNA as an information source to manufacture specific proteins. These proteins, in turn, control the characteristics or 'traits' of an organism Science, class X (NCERT 2025 ed.), Heredity, p.131. In the case of Bt Cotton, scientists identified a specific gene in a common soil bacterium called Bacillus thuringiensis (Bt). This gene provides the instructions to produce Cry proteins (crystal proteins), which have potent insecticidal properties against specific pests like the bollworm (lepidopterans).

The brilliance of this technology lies in its activation mechanism. The Cry protein produced by the plant is actually a 'pro-toxin'—meaning it is inactive and harmless in its natural state. It only becomes toxic when it enters the alkaline medium of an insect's digestive tract. Once the insect ingests the plant tissue, the high pH (alkaline) of its gut triggers the conversion of the pro-toxin into an active toxin. This active toxin then binds to the surface of the midgut cells, creating pores that cause the cells to swell and eventually lead to the death of the pest. Since humans and most mammals have an acidic stomach environment, the toxin remains inactive and is simply digested like any other protein, making it target-specific.

In the Indian context, the cry1Ac gene was the first to be successfully integrated into cotton hybrids. The Government of India approved the commercial cultivation of Bt cotton in 2002, leading to a massive shift in agricultural practices Environment and Ecology, Majid Hussain (Access publishing 3rd ed.), Major Crops and Cropping Patterns in India, p.40. While this significantly reduced the need for external chemical pesticides, it has also led to a shift in the local ecosystem, with secondary pests like mealy-bugs and mirid-bugs occasionally emerging as new challenges in fields where bollworms are no longer dominant.

Step	Process	Result
1. Transcription	The plant's DNA (with the Bt gene) makes mRNA.	Information is ready for use.
2. Translation	Plant cells produce the Cry protein.	The protein exists as an inactive 'pro-toxin'.
3. Ingestion	Insect eats the leaf/boll.	Pro-toxin enters the insect's gut.
4. Activation	Alkaline pH in insect gut activates the protein.	Toxin creates pores in the gut wall, killing the pest.

Sources: Science, class X (NCERT 2025 ed.), Heredity, p.131; Environment and Ecology, Majid Hussain (Access publishing 3rd ed.), Major Crops and Cropping Patterns in India, p.40

7. Bt Cotton: History and Status in India (exam-level)

Bt Cotton remains the only genetically modified (GM) crop officially permitted for commercial cultivation in India. The technology involves incorporating genes from a common soil bacterium, Bacillus thuringiensis (Bt), into the cotton genome. These specific genes, known as Cry genes (such as Cry1Ac), produce proteins that are toxic to certain pests, particularly the Lepidopteran family (bollworms), which historically devastated Indian cotton yields. After extensive field trials, the Government of India approved the commercial release of Bt cotton hybrids in Environment and Ecology, Majid Hussain, Major Crops and Cropping Patterns in India, p.40, marking a turning point in Indian agriculture. This technology was brought to India through a joint venture between the American firm Monsanto and the Indian company Mahyco. While Bt cotton led to a massive surge in production — making India the second-largest producer of cotton globally after China INDIA PEOPLE AND ECONOMY, NCERT Class XII, Land Resources and Agriculture, p.32 — it has also faced ecological challenges. While it effectively controlled the American Bollworm, the reduced use of broad-spectrum pesticides has led to the emergence of secondary pests like Mealy-bugs and Mirid-bugs, which the Bt toxin does not target Environment and Ecology, Majid Hussain, Major Crops and Cropping Patterns in India, p.40. Today, Bt technology covers more than 90% of India's cotton acreage, concentrated primarily in the 'black soil' tracts of Maharashtra and Gujarat.

Feature	Traditional Cotton	Bt Cotton (Bollgard II)
Primary Pest Control	Manual/Chemical spraying	Internal toxin (Cry1Ac + Cry2Ab genes)
Target Pests	General insects	Specific Lepidopterans (Bollworms)
Market Status	Low seed cost; high pesticide cost	High seed cost (regulated); lower pesticide cost

Sources: Environment and Ecology, Majid Hussain (Access publishing 3rd ed.), Major Crops and Cropping Patterns in India, p.40; Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.343; INDIA PEOPLE AND ECONOMY, TEXTBOOK IN GEOGRAPHY FOR CLASS XII (NCERT 2025 ed.), Land Resources and Agriculture, p.32

8. Solving the Original PYQ (exam-level)

This question is a classic application of the concepts you have just mastered regarding Genetic Engineering and Transgenic Crops. You have learned how specific genes are isolated from one organism and spliced into another to express a desired trait. Here, the trait is "insect resistance," which is achieved by incorporating a gene that produces a natural insecticide. This specific case study of Bt Cotton, introduced to India through a collaboration between Monsanto and Mahyco, represents the most significant commercial application of agricultural biotechnology in the country since 2002.

To arrive at the correct answer, think about the nomenclature used in biotechnology. The term "Bt" in Bt Cotton is not an arbitrary label; it is a direct abbreviation of the source organism. By recalling the biological origin of the Cry toxin (crystal protein), you can logically identify Bacillus thuringiensis as the soil bacterium that naturally produces these insecticidal proteins. The reasoning process follows a simple chain: the cry1Ac gene is extracted from the bacterium, inserted into the cotton genome, and the resulting transgenic plant then produces the toxin internally to defend against pests like the bollworm.

UPSC often uses taxonomic distractors—options that belong to the same genus but have different functions—to test the precision of your knowledge. While Bacillus subtilis is a widely studied laboratory model and Bacillus amyloliquefaciens is famous in molecular biology for providing the BamHI restriction enzyme, neither possesses the specific insecticidal properties required for this transgenic application. The trap here is the shared "Bacillus" genus name; however, only Bacillus thuringiensis (Option B) is the specific bio-pesticidal source used in the Bollgard technology described in the ScienceDirect Biotechnology Review.