Question map
Wolbachia method' is sometimes talked about with reference to which one of the following?
Explanation
The correct answer is Option 1.
The Wolbachia method is a biological control strategy used to curb the transmission of viral diseases such as Dengue, Zika, Chikungunya, and Yellow Fever. Wolbachia is a naturally occurring bacterium found in nearly 60% of insect species, but notably absent in the Aedes aegypti mosquito, the primary vector for these viruses.
When Aedes aegypti mosquitoes are introduced with Wolbachia in a laboratory and released into the wild, the bacterium competes with viruses inside the mosquito's body, making it difficult for the viruses to replicate. Consequently, the mosquitoes are less likely to transmit these diseases to humans. Furthermore, through a process called cytoplasmic incompatibility, when Wolbachia-carrying males mate with wild females, the eggs do not hatch, effectively reducing the mosquito population over time.
Options 2, 3, and 4 are incorrect as they refer to waste management and bio-manufacturing processes unrelated to vector control.
PROVENANCE & STUDY PATTERN
Full viewThis is a classic 'Term in News' question targeting a specific solution to a major public health crisis (Dengue). While standard books cover Dengue vectors, the specific 'Wolbachia' intervention is pure Current Affairs (widely covered in The Hindu/IE during 2021-2022). If you track S&T 'solutions' rather than just 'theories', this was a giveaway.
This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.
- Statement 1: Is the Wolbachia method used to control viral diseases transmitted by mosquitoes (for example dengue or Zika)?
- Statement 2: Is the Wolbachia method used to convert crop residues into packing material?
- Statement 3: Is the Wolbachia method used to produce biodegradable plastics?
- Statement 4: Is the Wolbachia method used to produce biochar via thermo-chemical conversion of biomass?
- Explicitly describes the Wolbachia method as replacing Aedes aegypti with Wolbachia-carrying Aedes aegypti.
- States these Wolbachia-carrying mosquitoes "have a reduced capacity to transmit dengue, Zika and chikungunya," directly linking the method to control of those viral diseases.
- Describes the Wolbachia Aedes aegypti population replacement method and the goal of reaching coverage threshold.
- Reports that the method's efficacy was evaluated in a cluster randomized controlled trial to determine whether it was effective in reducing the incidence of symptomatic dengue, showing use for controlling dengue.
- From an implementing organization: reports projects in multiple countries using the Wolbachia method.
- States that in areas where Wolbachia is self-sustaining, "dengue transmission has been significantly reduced," supporting real-world use to control dengue.
States that dengue is caused by a virus and is carried by Aedes aegypti (a mosquito species).
A student could extend this by checking whether interventions target Aedes mosquitoes specifically and whether biological approaches (e.g., infecting mosquitoes with microbes) are used to reduce virus carriage.
Lists dengue as a viral disease and emphasizes prevention measures including control of mosquito breeding.
Use the link between dengue being mosquito‑borne and breeding control to investigate non‑chemical control methods (such as releasing modified or microbe‑infected mosquitoes).
Describes national vectorborne disease control programmes and states the main prevention strategy is integrated vector control.
A student could look within 'integrated vector control' for biological control components (e.g., Wolbachia releases) as part of programmatic methods.
Defines vectors as insects like mosquitoes that spread pathogens and links understanding spread to taking protective measures.
From the general concept of vectors, one can explore vector‑targeted strategies including genetic or microbial modifications that aim to block pathogen transmission.
Notes that blood‑sucking arthropods such as mosquitoes are especially effective transmitters of epidemic diseases.
This supports investigating interventions that reduce mosquito transmission efficiency (for example, methods that reduce a mosquito's ability to transmit viruses).
- Describes the Wolbachia method in terms of releasing Wolbachia-carrying mosquitoes to control disease.
- No mention of converting crop residues or producing packing material — focus is on mosquito releases and disease reduction.
- Explains the Wolbachia 'population replacement' method for Aedes aegypti and its goal of reducing dengue incidence.
- Context is clearly public‑health mosquito control, not material conversion or agricultural processing.
- States Wolbachia establishes itself in mosquito populations and is an economically attractive, one‑off vector control approach.
- Again centers on mosquito population control and disease prevention, not on converting crop residues into packing material.
Explicit example that a crop residue (bagasse from sugarcane) is used to manufacture paper and other products, indicating residues can be processed into packing/raw materials.
A student could note that if bagasse can be processed into paper/packing, other residue-to-packing routes are plausible and should be checked for biological processing methods.
Describes engineered microbial mixtures (e.g., 'oilzapper') used to transform contaminants via biodegradation, showing microbes can be harnessed in engineered processes to convert organic material.
One could infer that microbial methods might be adapted to transform crop residues into useful materials and therefore seek whether Wolbachia specifically is used that way.
Zero Budget Natural Farming emphasizes using and enhancing soil microorganisms to process organic inputs (jivamrit, mulching) — a pattern of using microbes to manage and transform organic residues.
Suggests checking whether particular microbes used in agriculture (like Wolbachia) are employed in residue-processing applications for material production.
Notes that residue decomposition and recycling improve resource use efficiency, indicating crop residues are routinely biologically processed to recover materials/nutrients.
A student could use this to justify investigating specific biological agents or methods (including Wolbachia) for value-added conversion of residues into materials.
Lists 'leftover organic residue' (farm, forest, urban, algal) as recognized feedstock categories, implying a variety of residues are available for conversion into products.
Combine this with knowledge that such residues are used industrially to probe whether any biological method (including Wolbachia) is applied to convert them into packing material.
- Explicitly describes what the Wolbachia method does — it blocks viruses inside Aedes aegypti mosquitoes.
- Shows the method’s purpose is reducing viral transmission (dengue, chikungunya, Zika), not manufacturing or materials.
- Describes the Wolbachia method as a public-health intervention protecting people and reducing dengue transmission.
- Refers to projects and impact on disease, reinforcing that the technique is for vector control rather than plastics.
- Explains the Wolbachia replacement method and its goal of reducing dengue incidence via mosquito population replacement.
- Frames the method as an epidemiological trial/intervention, not a materials or manufacturing process.
Gives a concise definition of 'biodegradable' as breakdown by natural processes into simpler compounds.
A student could use this to ask whether Wolbachia (a microbe) has metabolic pathways that could break down or biosynthesize polymeric materials into simpler compounds.
Defines 'non-biodegradable' pollutants as those not decomposed by microbial action and lists plastics as an example.
Use this rule to frame the question: if plastics are typically resistant to microbial decomposition, does Wolbachia have special enzymatic abilities to degrade or produce biodegradable polymers?
States that 'new types of plastics which are said to be biodegradable are available' and suggests investigating such materials and their environmental effects.
A student could look up how these new biodegradable plastics are produced (e.g., chemically or biologically) and check if any production methods name Wolbachia.
Notes that environmental degradation of plastics varies (e.g., UV-induced photo-oxidation rates differ by setting), highlighting that biodegradability is one of several degradation routes.
This suggests checking whether Wolbachia would operate via biodegradation (microbial) rather than abiotic routes, so one should search for microbial biosynthesis or biodegradation roles of Wolbachia related to polymers.
Contains exercises distinguishing biodegradable items from plastics (implying plastics are generally non-biodegradable) and frames biodegradable classification as a basic criterion.
A student can use such classification tests to narrow searches: if Wolbachia is implicated, it should appear in literature describing organisms that confer biodegradability or produce biodegradable polymers.
- Describes Wolbachia as an intracellular endosymbiont transinfected into Aedes aegypti in the laboratory — indicating the method targets mosquitoes, not biomass conversion.
- Explains maternal transmission and reproductive manipulation (cytoplasmic incompatibility), which are biological control mechanisms unrelated to thermo-chemical processes.
- Labels the approach as 'The Wolbachia biocontrol method' and describes releasing Wolbachia-infected Ae. aegypti into wild populations — a mosquito control intervention.
- Explains that released Wolbachia mosquitoes increase in prevalence in the local mosquito population, which is unrelated to producing biochar from biomass.
- From the World Mosquito Program: refers to the 'Wolbachia method' in the context of protecting people and reducing dengue transmission — demonstrating public-health mosquito control use.
- Mentions projects and millions of people protected, further confirming the method's application is vector control, not thermochemical biomass conversion.
States that chemical/thermo‑chemical processes such as gasification, combustion and pyrolysis convert biomass to useful products.
A student could use this to check whether 'biochar' is a known pyrolysis product and then ask whether Wolbachia is associated with pyrolysis processes.
Describes biogas production as decomposition of organic matter in absence of air (anaerobic biological process), i.e., a biological, not thermo‑chemical, route to bio‑energy.
Use this contrast to separate biological methods (like microbial manipulation) from thermo‑chemical routes when evaluating whether a microbe‑based Wolbachia method would produce biochar.
Explains bio‑energy via decomposition/anaerobic digestion giving gas and digestate, highlighting alternative (non‑thermo‑chemical) biomass conversions.
A student could use this to infer that methods producing gases/slurry differ technically from pyrolysis that yields solid char, so check whether Wolbachia relates to digestion or to heat processes.
Lists typical biomass feedstocks (coconut shell, straw, bagasse, rice husk) used for energy production.
One can compare common feedstocks for pyrolysis/biochar production with any feedstock claims about a Wolbachia method to see if they align.
Summarizes types of renewable energy and explicitly lists biomass energy as an established category for conversion to fuels/energy.
Use this to situate 'biochar via thermo‑chemical conversion' within standard biomass energy pathways and then question whether Wolbachia fits into those pathways.
- [THE VERDICT]: Sitter for newspaper readers; Bouncer for static-only aspirants. Source: Frequent mentions in Science & Tech sections (e.g., World Mosquito Program trials in Indonesia/India).
- [THE CONCEPTUAL TRIGGER]: Public Health & Vector Control. The syllabus theme is 'Application of Biotechnology/Microbiology in Human Life'.
- [THE HORIZONTAL EXPANSION]: Memorize these 'Bio-Control' siblings: 1. Sterile Insect Technique (SIT) (Radiation sterilization), 2. Oxitec's Friendly™ Mosquitoes (GM lethal gene), 3. Gambusia affinis (Mosquito-fish), 4. Bacillus thuringiensis israelensis (Bti) (Larvicide), 5. Miyawaki Method (Urban forestry - often a distractor).
- [THE STRATEGIC METACOGNITION]: When a new scientific term appears in headlines, apply the 'Problem-Solution' filter. Does it solve Pollution, Disease, or Energy? If yes, memorize: (1) The Agent (Bacteria/Virus/Tech), (2) The Target (Mosquito/Plastic/Carbon), and (3) The Mechanism (Blocking virus/Eating waste).
Dengue is a viral disease transmitted by Aedes mosquitoes, so understanding mosquito vector biology is central to the question.
High-yield for public health and geography questions: explains transmission pathways, risk groups, and underpins control strategies. Connects to epidemiology, outbreak investigation, and vector ecology; enables questions on disease transmission and prevention measures.
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Dengue and Chikungunya > p. 79
- Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 3: Health: The Ultimate Treasure > 3.4.1 How are communicable diseases caused and spread? > p. 33
- Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 3: Health: The Ultimate Treasure > Activity 3.4: Let us find out > p. 35
Control of mosquito-borne diseases centers on measures like breeding-site control, nets, repellents, and national vector-borne disease programmes.
Important for policy and governance questions: links programmatic responses (e.g., National Vectorborne Disease Control Programme) to practical interventions. Useful for questions on health policy, programme evaluation, and climate-health linkages.
- Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 3: Health: The Ultimate Treasure > Activity 3.4: Let us find out > p. 35
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Dengue and Chikungunya > p. 80
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 23: India and Climate Change > 23.3,7. Health > p. 301
Dengue incidence varies seasonally and environmental conditions during peak months influence transmission.
Useful for questions on disaster management, climate impacts on health, and planning preventive campaigns. Helps answer questions on timing of interventions and links to monsoon/climate patterns.
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Dengue and Chikungunya > p. 79
- Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 3: Health: The Ultimate Treasure > Keep the curiosity alive > p. 44
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Dengue and Chikungunya > p. 80
Crop residues such as bagasse are converted into industrial products including paper and other material substitutes used in manufacturing and packaging.
High-yield for questions on agro-industrial linkages, biomass value chains and renewable raw materials. Helps answer questions on rural economy value-addition, alternative raw materials for industry, and policy on crop residue utilisation. Connects agriculture with industry, energy and environmental sustainability themes.
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 12: Major Crops and Cropping Patterns in India > Sugarcane (Saccharum spp) > p. 34
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 3: Terrestrial Ecosystems > 4) Raw Material Requirements > p. 30
Using crop residues for mulching, nutrient recycling and soil health is a core practice in conservation agriculture and organic farming.
Essential for questions on sustainable agriculture, soil management and climate-smart practices. Links to topics like zero-budget natural farming, nutrient cycles and greenhouse gas mitigation — frequent UPSC overlaps with environment and agriculture sections.
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 23: India and Climate Change > Sources ofBio - Energy > p. 307
- Indian Economy, Vivek Singh (7th ed. 2023-24) > Chapter 11: Agriculture - Part II > Advantages of Conservation Agriculture (CA): > p. 353
- Indian Economy, Vivek Singh (7th ed. 2023-24) > Chapter 11: Agriculture - Part II > 11.9 Organic Farming > p. 345
Microbial techniques (e.g., engineered composting, bacterial mixtures) are used to biologically degrade or convert wastes, illustrating how microbes enable waste-to-resource processes.
Useful for questions on biotechnology applications in environment and agriculture, waste management and bio-based solutions. Enables evaluation of claims about biological methods for converting residues and clarifies limits of specific microbes or techniques.
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > bi Ex situ bioremediation techniques > p. 100
- Indian Economy, Vivek Singh (7th ed. 2023-24) > Chapter 11: Agriculture - Part II > Features of Zero Budget Natural Farming (ZBNF): > p. 349
Biodegradable materials are broken down by natural processes while non-biodegradable materials resist microbial decomposition.
This distinction underpins questions on waste categorization, management and policy responses; mastering it helps answer issues on pollution, recycling and legal bans. It connects to environmental chemistry, waste management and regulatory frameworks and enables elimination-style and definition-based questions in exams.
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 12: Major Crops and Cropping Patterns in India > Glossary > p. 101
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > 5.r.r. Classifications > p. 63
Gene Drive Technology. While Wolbachia reduces viral transmission, 'Gene Drives' (using CRISPR) are the next frontier, designed to force a genetic trait (like infertility) through a population to wipe it out. Expect a question on the ethical or technical difference between 'Population Suppression' (Gene Drive) vs 'Population Replacement' (Wolbachia).
Linguistic Forensics: 'Wolbachia' ends in '-ia', a common suffix for bacterial genus names (e.g., Escherichia, Salmonella, Rickettsia). This strongly suggests a biological agent. Options B, C, and D describe industrial/chemical processes (converting residues, producing plastics, thermo-chemical conversion). Option A is the only 'Biological' interaction (Disease/Mosquitoes). Trust the suffix.
Mains GS-3 (Science) to GS-2 (Health Governance): Wolbachia represents a shift from 'Chemical Control' (DDT/Fogging) to 'Biological Control'. This links to 'One Health' approach and sustainable urban governance (SDG 3 & 11), reducing chemical load in the environment.