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Q67 (IAS/2023) Science & Technology › Biotechnology & Health › Human infectious diseases Official Key

Wolbachia method' is sometimes talked about with reference to which one of the following?

Result
Your answer:  ·  Correct: A
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.

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Q. Wolbachia method' is sometimes talked about with reference to which one of the following? [A] Controlling the viral diseases spread by m…
At a glance
Origin: Mostly Current Affairs Fairness: Low / Borderline fairness Books / CA: 0/10 · 10/10

This 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.

How this question is built

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)?
Origin: Web / Current Affairs Fairness: CA heavy Web-answerable

Web source
Presence: 5/5
"Do you understand that this method replaces the population of *Aedes aegypti* mosquitoes with *Aedes aegypti* mosquitoes carrying *Wolbachia*, which have a reduced capacity to transmit dengue, Zika and chikungunya?"
Why this source?
  • 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.
Web source
Presence: 5/5
"The efficacy of the Wolbachia Aedes aegypti population replacement method was evaluated in a cluster randomized controlled trial within Yogyakarta City, Indonesia. The aim of the study was to determine whether and to what extent Wolbachia replacement method was effective in reducing the incidence of symptomatic dengue"
Why this source?
  • 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.
Web source
Presence: 4/5
"In areas where *Wolbachia* is self-sustaining at a high level, dengue transmission has been significantly reduced."
Why this source?
  • 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.

Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Dengue and Chikungunya > p. 79
Strength: 5/5
“Dengue is a type of fever which is also called as 'Break-bone Fever' or 'Dandy Fever'. Diseases like malaria, dengue and chikungunya are seasonal and show fuctuating trends in various seasons in diferent years. Te dengue virus is carried by the yellow-fever mosquito, Aedes aegypti. Te Asiatic tiger mosquito is another prominent carrier of the virus. Tere have been recent breakouts of dengue and chickengunya. In brief, dengue is characterised by fever and extreme pain in and stifness of joints (hence the name 'break-bone fever'. A mosquito becomes infected only if it bites an infected individual (humans and monkeys) during the frst three days of the victims illness.”
Why relevant

States that dengue is caused by a virus and is carried by Aedes aegypti (a mosquito species).

How to extend

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.

Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 3: Health: The Ultimate Treasure > Activity 3.4: Let us find out > p. 35
Strength: 4/5
“• Col1: Malaria; Col2: Protozoa; Col3: Skin, blood; Diseases transmitted by insects: High fever, profuse sweating, periodic chills; Col5: Use of mosquito nets and repellents, wearing long–sleeved clothes, control of mosquito breeding in and around your home • Col1: Dengue fever (Break bone fever); Col2: Virus; Col3: Skin, blood; Diseases transmitted by insects: Fever, headache, muscle and joint pain, nausea; Col5: Use of mosquito nets and repellents, wearing long-sleeved clothes, control of mosquito breeding in and around your home, avoiding areas with still water By studying the Table 3.1, we can understand how infectious diseases spread and how to prevent them.”
Why relevant

Lists dengue as a viral disease and emphasizes prevention measures including control of mosquito breeding.

How to extend

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).

Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Dengue and Chikungunya > p. 80
Strength: 4/5
“Tere is no vaccine currently available. Chloroquine is gaining ground as possible treatment for the symptoms associated with dengue/Chikungunya, and as an anti-infammatory agent to combat the arthritis associated with Chikungunya virus. For the prevention, and control of vector-borne diseases including malaria, dengue and chikungunya, the Government of India is implementing an integrated National Vectorborne Disease Control Programme under the over-arching umbrella of National Rural Health Mission. Te main strategy for prevention and control of vectorborne diseases advocates for integral vector control, early ease detection and complete treatment.”
Why relevant

Describes national vectorborne disease control programmes and states the main prevention strategy is integrated vector control.

How to extend

A student could look within 'integrated vector control' for biological control components (e.g., Wolbachia releases) as part of programmatic methods.

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
Strength: 3/5
“personal items of an infected person. Some of the communicable diseases spread through contaminated drinking water or food. Some pathogens are also spread by insects like mosquitoes and houseflies—these insects are called vectors (Fig. 3.4). By understanding how diseases spread, we can take simple steps to protect ourselves and others. Let us find out how these communicable diseases spread and how we can prevent them.”
Why relevant

Defines vectors as insects like mosquitoes that spread pathogens and links understanding spread to taking protective measures.

How to extend

From the general concept of vectors, one can explore vector‑targeted strategies including genetic or microbial modifications that aim to block pathogen transmission.

Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 17: Contemporary Issues > Transmission > p. 25
Strength: 3/5
“Epidemic diseases are transmitted in many ways. Some of the ways of their transmission are as under: • 1. By direct contact, for example, droplets sprayed about when a patient coughs or sneezes• 2. By contaminated food and water.• 3. By arthropods—filth associated flies—of various types that may serve as mechanical carriers of disease germs as in dysentery and cholera. Blood-sucking arthropods like mosquitoes are more effective transmitters.”
Why relevant

Notes that blood‑sucking arthropods such as mosquitoes are especially effective transmitters of epidemic diseases.

How to extend

This supports investigating interventions that reduce mosquito transmission efficiency (for example, methods that reduce a mosquito's ability to transmit viruses).

Statement 2
Is the Wolbachia method used to convert crop residues into packing material?
Origin: Web / Current Affairs Fairness: CA heavy Web-answerable

Web source
Presence: 5/5
"How we release Wolbachia mosquitoes Together with communities around the world, we’ve released Wolbachia mosquitoes into many towns and cities."
Why this source?
  • 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.
Web source
Presence: 5/5
"Reaching this critical threshold is the key goal of Wolbachia replacement methods. The efficacy of the Wolbachia Aedes aegypti population replacement method was evaluated ... to determine whether ... Wolbachia replacement method was effective in reducing the incidence of symptomatic dengue"
Why this source?
  • 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.
Web source
Presence: 5/5
"can establish a vice-like grip in a population of mosquitoes. ... it is a one-off solution as the Wolbachia are passed on from one generation of mosquitoes to the next."
Why this source?
  • 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.

Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 12: Major Crops and Cropping Patterns in India > Sugarcane (Saccharum spp) > p. 34
Strength: 5/5
“Sugarcane belongs to bamboo family of plants. It is the main source of sugar, gur and khandsari. It also provides raw material for manufacturing alcohol. Bagasse (the crushed cane residue), is used for the manufacturing of paper. It is also an efcient substitute for petroleum products and a host of other chemical products. Te upper green part of sugarcane is used as a nutritious fodder for cattle. Sugarcane contributes nearly 78 % to the total sugar pool at the global level. It is the prime source of sugar in India; also holding the prominent position as the commercial cash crop of India.”
Why relevant

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.

How to extend

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.

Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > bi Ex situ bioremediation techniques > p. 100
Strength: 4/5
“(bi Ex situ bioremediation techniques • Ex situ - involves the removal of the contaminated material to be treated elsewhere, • e Landfarming: contaminated soil is excavated and spread over a prepared bed and periodically tilled until pollutants are degraded. The goal is to stimulate indigenous biodegradative microorganisms and facilitate their aerobic degradation of contaminants. • Biopiles: it is a hybrid of landfarming and composting. Essentially, engineered cells are constructed as aerated composted piles. Using bioremediation techniques, TERI has developed a mixture of bacteria called 'oilzapper' which degrades the pollutants of oil-contaminated sites, leaving behind no harmful residues. This technique is not only environment friendly, but also highly cost-effective.”
Why relevant

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.

How to extend

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.

Indian Economy, Vivek Singh (7th ed. 2023-24) > Chapter 11: Agriculture - Part II > Features of Zero Budget Natural Farming (ZBNF): > p. 349
Strength: 3/5
“• The premise of ZBNF is that soil has all the nutrients plants need. To make these nutrients available to plants, we need the intermediation of microorganisms. For this, "four wheels of ZBNF" have been suggested: • Bijamrit is the microbial coating of seeds with formulations of cow urine and cow dung• Jivamrit is the enhancement of soil microbes using an inoculum of cow dung, cow urine, and jaggery• Mulching is the covering of soil with crops or crop residues which creates humus and encourages the growth of friendly microorganisms• Waaphasa is the building up of soil humus to increase soil aeration• According to ZBNF principles, plants get 98% of their supply of nutrients from the air, water, and sunlight.”
Why relevant

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.

How to extend

Suggests checking whether particular microbes used in agriculture (like Wolbachia) are employed in residue-processing applications for material production.

Indian Economy, Vivek Singh (7th ed. 2023-24) > Chapter 11: Agriculture - Part II > Advantages of Conservation Agriculture (CA): > p. 353
Strength: 3/5
“• CA based crop management practices not only enhance crop productivity but also reduces cost of production• Improvement of resource use efficiency through residue decomposition, increased recycling and availability of plant nutrients• Protection of organic matter and soil and water conservation• Reduction in greenhouse gas emissions”
Why relevant

Notes that residue decomposition and recycling improve resource use efficiency, indicating crop residues are routinely biologically processed to recover materials/nutrients.

How to extend

A student could use this to justify investigating specific biological agents or methods (including Wolbachia) for value-added conversion of residues into materials.

Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 23: India and Climate Change > Sources ofBio - Energy > p. 307
Strength: 2/5
“• Existing Sources • Leftover organic residue • Leftover farm organic residue • Leftover forest residue • Leftover organic urban residue • Algal residue • New Sources • Cultivation of short rotation energy crops • Social forestry”
Why relevant

Lists 'leftover organic residue' (farm, forest, urban, algal) as recognized feedstock categories, implying a variety of residues are available for conversion into products.

How to extend

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.

Statement 3
Is the Wolbachia method used to produce biodegradable plastics?
Origin: Web / Current Affairs Fairness: CA heavy Web-answerable

Web source
Presence: 5/5
""We discovered that *Wolbachia* blocks viruses like dengue, chikungunya and Zika from growing in the bodies of *Aedes aegypti* mosquitoes. This means that *Wolbachia* mosquitoes have a reduced ability to transmit viruses to people.""
Why this source?
  • 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.
Web source
Presence: 5/5
""Our *Wolbachia* method. We have set up projects in 14 countries and our *Wolbachia*mosquitoes have protected almost 11 million people (December 2022). In areas where *Wolbachia* is self-sustaining at a high level, dengue transmission has been significantly reduced.""
Why this source?
  • 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.
Web source
Presence: 4/5
""Reaching this critical threshold is the key goal of Wolbachia replacement methods. The efficacy of the Wolbachia Aedes aegypti population replacement method was evaluated in a cluster randomized controlled trial... to determine whether and to what extent Wolbachia replacement method was effective in reducing the incidence of symptomatic dengue""
Why this source?
  • 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.

Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 12: Major Crops and Cropping Patterns in India > Glossary > p. 101
Strength: 5/5
“Biodegradable: Able to be broken by natural processes into simpler compounds.”
Why relevant

Gives a concise definition of 'biodegradable' as breakdown by natural processes into simpler compounds.

How to extend

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.

Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > 5.r.r. Classifications > p. 63
Strength: 5/5
“E.g. sewage.• r Non-biodegradable Pollutants: Pollutants, which are not decomposed by microbial action. E.g. plastics, glass, DDT, salts of heavy metals, radioactive substances etc.”
Why relevant

Defines 'non-biodegradable' pollutants as those not decomposed by microbial action and lists plastics as an example.

How to extend

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?

Science , class X (NCERT 2025 ed.) > Chapter 13: Our Environment > Activity 13.6 > p. 214
Strength: 4/5
“• n Use the library or internet to find out more about biodegradable and non-biodegradable substances.• n How long are various non-biodegradable substances expected to last in our environment?• n These days, new types of plastics which are said to be biodegradable are available. Find out more about such materials and whether they do or do not harm the environment.”
Why relevant

States that 'new types of plastics which are said to be biodegradable are available' and suggests investigating such materials and their environmental effects.

How to extend

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.

Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > 5.12.1. Plastics as a Waste Material in Marine Environment > p. 96
Strength: 3/5
“The amount of plastic waste estimation annually introduced into the marine environment is not available. But, plastic waste is well known to result primarily from fishing-related activities, and from non-point source influx from beaches. There are two clear differences between the fate of plastics debris in the ocean environment as opposed to on land environments. • a) The rate of UV-induced photo-oxidative degradation of plastics floating or submerged at sea is very much slower than that exposed to the same solar radiation on land. • b) Unlike on land, there is no easy means of retrieval, sorting and recycling of plastic waste that enters into the ocean environment.”
Why relevant

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.

How to extend

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.

Science , class X (NCERT 2025 ed.) > Chapter 13: Our Environment > EXERCISES > p. 216
Strength: 3/5
“• 1. Which of the following groups contain only biodegradable items? • (a) Grass, flowers and leather• (b) Grass, wood and plastic• (c) Fruit-peels, cake and lime-juice• (d) Cake, wood and grass• 2. Which of the following constitute a food-chain? • (a) Grass, wheat and mango• (b) Grass, goat and human”
Why relevant

Contains exercises distinguishing biodegradable items from plastics (implying plastics are generally non-biodegradable) and frames biodegradable classification as a basic criterion.

How to extend

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.

Statement 4
Is the Wolbachia method used to produce biochar via thermo-chemical conversion of biomass?
Origin: Web / Current Affairs Fairness: CA heavy Web-answerable

Web source
Presence: 5/5
"Our method utilises Wolbachia, obligate intracellular endosymbionts that are common in insect species but were not present in Ae. aegypti mosquitoes until they were stably transinfected in the laboratory. In insects Wolbachia is maternally transmitted via the egg and manipulates insect reproduction to favour its own population dissemination via cytoplasmic incompatibility (CI)."
Why this source?
  • 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.
Web source
Presence: 5/5
"Figure 4. The Wolbachia biocontrol method. Ae. aegypti mosquitoes with Wolbachia (green) are released into the wild mosquito population (black). Over a series of releases, the percentage of Wolbachia mosquitoes increases."
Why this source?
  • 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.
Web source
Presence: 5/5
"*Wolbachia* method. We have set up projects in 14 countries and our *Wolbachia* mosquitoes have protected almost 11 million people (December 2022)."
Why this source?
  • 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.

Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 22: Renewable Energy > 22.6 BIOMASS > p. 292
Strength: 5/5
“Biomass, on the other hand, releases carbon dioxide that is largely balanced by the carbon dioxide captured in its own growth (depending how much energy was used to grow, harvest, and process the fuel) Chemical processes like gasification, combustion and pyrolysis convert biomass to useful products. Combustion being the most common of them. Each of the technologies mentioned produces a major calorific end product and a mixture of by-products. The processing method is selected on the basis of nature.”
Why relevant

States that chemical/thermo‑chemical processes such as gasification, combustion and pyrolysis convert biomass to useful products.

How to extend

A student could use this to check whether 'biochar' is a known pyrolysis product and then ask whether Wolbachia is associated with pyrolysis processes.

NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 5: Print Culture and the Modern World > Biogas > p. 117
Strength: 4/5
“Shrubs, farm waste, animal and human waste are used to produce biogas for domestic consumption in rural areas. Decomposition of organic matter yields gas, which has higher thermal efficiency in comparison to kerosene, dung cake and charcoal. Biogas plants are set up at municipal, cooperative and individual levels. The plants using cattle dung are known as 'Gobar gas plants' in rural India. These provide twin benefits to the farmer in the form of energy and improved quality of”
Why relevant

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.

How to extend

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.

Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 8: Energy Resources > Bio-Energy > p. 30
Strength: 4/5
“Bio-energy is a clean source of energy which improves sanitation, hygiene and the living style of the rural population. The technique is based on the decomposition of organic matter in the absence of air to produce gas. Bio-gas is used for cooking, and lighting fuel in specially designed stove and lamps respectively. According to one estimate, India has a capacity to produce biogas to the extent of 25,000 million cubic m. The left over digested slurry serves as manure. This can meet 50% of the rural domestic fuel requirements. Moreover, it can produce 7 million tonnes to nitrogen, 3 million tonnes phosphate, 5 million tonnes of potassium, and over 50 million tonnes of compost manure.”
Why relevant

Explains bio‑energy via decomposition/anaerobic digestion giving gas and digestate, highlighting alternative (non‑thermo‑chemical) biomass conversions.

How to extend

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.

Indian Economy, Nitin Singhania .(ed 2nd 2021-22) > Chapter 15: Infrastructure > Biomass > p. 453
Strength: 3/5
“• Obtained from plants and trees including coconut shell, straw, bagasse, rice husk, etc. • Main purpose is to encourage afforestation for energy. ø• Till now, 643 MW capacity has been installed. ۰• Biomass Power and Cogeneration Programme promotes technologies for efficient \utilisation of biomass resources for grid power generation.”
Why relevant

Lists typical biomass feedstocks (coconut shell, straw, bagasse, rice husk) used for energy production.

How to extend

One can compare common feedstocks for pyrolysis/biochar production with any feedstock claims about a Wolbachia method to see if they align.

Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 22: Renewable Energy > Renewabte energy comprises of > p. 287
Strength: 3/5
“• Solar energy – generated from the sun • Hydroelectric (hydel) energy – derived from water • Biomass energy – from firewood, animal dung, biodegradable waste and crop residues, when it is burnt. • Geothermal energy – energy from hot dry rocks, magma, hot water springs, natural geysers, etc. • Ocean thermal energy – from waves and also from tidal waves. • Co-generation – producing two forms of energy from one fuel. • Fuel cells are also being used as a cleaner energy source. Secondary source - non-renewable energy generated through the conversion of coal, oil, natural gas etc. The Government has up-scaled the target of renewable energy capacity to 75 GW by the year 2022, which includes 100 GW from solar, 60 GW from wind, 10 GW from bio-power and 5 GW from small hydro-power.”
Why relevant

Summarizes types of renewable energy and explicitly lists biomass energy as an established category for conversion to fuels/energy.

How to extend

Use this to situate 'biochar via thermo‑chemical conversion' within standard biomass energy pathways and then question whether Wolbachia fits into those pathways.

Pattern takeaway: UPSC Science & Tech is rarely about abstract theory; it is about 'Applied Science'. The pattern is consistent: A specific method name (Wolbachia, Miyawaki, CRISPR) is paired with the societal problem it solves. Focus on the utility of the tech.
How you should have studied
  1. [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).
  2. [THE CONCEPTUAL TRIGGER]: Public Health & Vector Control. The syllabus theme is 'Application of Biotechnology/Microbiology in Human Life'.
  3. [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).
  4. [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).
Concept hooks from this question
📌 Adjacent topic to master
S1
👉 Mosquitoes as vectors of viral diseases
💡 The insight

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.

📚 Reading List :
  • 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
🔗 Anchor: "Is the Wolbachia method used to control viral diseases transmitted by mosquitoes..."
📌 Adjacent topic to master
S1
👉 Integrated vector control and prevention measures
💡 The insight

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.

📚 Reading List :
  • 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
🔗 Anchor: "Is the Wolbachia method used to control viral diseases transmitted by mosquitoes..."
📌 Adjacent topic to master
S1
👉 Seasonality and environmental drivers of dengue
💡 The insight

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.

📚 Reading List :
  • 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
🔗 Anchor: "Is the Wolbachia method used to control viral diseases transmitted by mosquitoes..."
📌 Adjacent topic to master
S2
👉 Industrial uses of crop residues (bagasse)
💡 The insight

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.

📚 Reading List :
  • 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
🔗 Anchor: "Is the Wolbachia method used to convert crop residues into packing material?"
📌 Adjacent topic to master
S2
👉 Role of crop residues in conservation and organic farming
💡 The insight

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.

📚 Reading List :
  • 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
🔗 Anchor: "Is the Wolbachia method used to convert crop residues into packing material?"
📌 Adjacent topic to master
S2
👉 Biological conversion and bioremediation using microbes
💡 The insight

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.

📚 Reading List :
  • 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
🔗 Anchor: "Is the Wolbachia method used to convert crop residues into packing material?"
📌 Adjacent topic to master
S3
👉 Biodegradable vs non-biodegradable materials
💡 The insight

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.

📚 Reading List :
  • 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
🔗 Anchor: "Is the Wolbachia method used to produce biodegradable plastics?"
🌑 The Hidden Trap

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).

⚡ Elimination Cheat Code

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 Connection

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.

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