Why this chapter matters for UPSC: Science and technology is a core GS3 topic. This chapter introduces the scientific method (basis of evidence-based policy), India's ancient scientific contributions (GS1 heritage angle), and modern institutional frameworks — ISRO, NRF Act 2023, Atal Innovation Mission, and India's rise in the Global Innovation Index. Prelims regularly feature ISRO missions and S&T policy; Mains demands analytical depth on India's innovation ecosystem.

PART 1 — Quick Reference Tables

Table 1: Ancient Indian Scientists and Contributions

ScientistPeriodKey ContributionSignificance
Pingala~3rd century BCEBinary number system (chandas-shastra)Preceded Leibniz by ~1,900 years
Charaka~2nd century BCECharaka Samhita — systematic medicine, ethicsFoundation of Ayurveda; drug trials concept
Sushruta~600 BCESushruta Samhita — 300+ surgical procedures, rhinoplastyWorld's earliest recorded surgery
Aryabhata476–550 CEZero, place value, Earth's rotation, solar year = 365.25 daysHeliocentric concept predated Copernicus
Brahmagupta628 CERules for zero and negative numbers, gravity conceptFoundation of modern algebra
Bhaskaracharya12th centuryConcepts of calculus (derivatives, infinitesimals)Preceded Newton and Leibniz by ~500 years

Table 2: Key Modern S&T Institutions and Bodies

InstitutionFull NameFunctionKey Fact
ISROIndian Space Research OrganisationSpace missions, satellite techFounded 1969; HQ Bengaluru
DRDODefence Research and Development OrganisationDefence technology52 labs; ~30,000 scientists
CSIRCouncil of Scientific and Industrial ResearchCivilian R&D37 national labs across India
ICARIndian Council of Agricultural ResearchAgricultural science113 institutes; Green Revolution link
ICMRIndian Council of Medical ResearchBiomedical researchIndia's COVID-19 vaccine oversight
DSTDepartment of Science and TechnologyPolicy + fundingUnder Ministry of S&T
NRFAnusandhan National Research FoundationCompetitive research fundingNRF Act 2023; ₹50,000 cr over 5 yrs

Table 3: Recent ISRO Milestones (UPSC Prelims Targets)

MissionDateAchievement
Chandrayaan-3Aug 23, 2023First soft landing near Moon's South Pole (Shiv Shakti Point); first nation to achieve this
Aditya-L1Sep 2, 2023 (launch); Jan 6, 2024 (L1 insertion)India's first solar observatory; studies solar corona, solar wind
PSLV-C57Launched Aditya-L1PSLV's 59th mission
OneWeb India-22023ISRO launched 36 LEO broadband satellites for OneWeb

PART 2 — Detailed Notes

1. What Is Science?

Key Term

Science is the systematic study of the natural world through observation, hypothesis, experimentation, data analysis, and conclusion. Science is a process — a method of inquiry — not merely a fixed body of facts. Scientific knowledge is always provisional: it is revised when better evidence emerges (e.g., Newtonian mechanics revised by Einstein's relativity).

Science distinguishes itself from belief or tradition by demanding:

  • Empirical evidence — based on observation and measurement
  • Falsifiability — a claim must be testable and potentially disprovable (Karl Popper's criterion)
  • Reproducibility — results must be independently replicable
  • Peer review — findings scrutinised by the scientific community before acceptance

2. The Scientific Method

Explainer

Steps of the Scientific Method:

  1. Observation — notice a phenomenon (e.g., plants near windows grow faster)
  2. Question — frame a testable question (Does light affect plant growth?)
  3. Hypothesis — propose a testable explanation (Plants grow faster with more light)
  4. Experiment — design a controlled test; change one variable (independent), measure another (dependent), keep all else constant (controlled)
  5. Data Collection — record measurements systematically (qualitative + quantitative)
  6. Analysis — look for patterns; use statistics
  7. Conclusion — support or reject hypothesis
  8. Publication / Peer Review — share results for community scrutiny

Controlled variable is the most testable concept in Prelims MCQs on scientific method.

3. Branches of Science

  • Physics — matter, energy, forces, motion, electricity, waves
  • Chemistry — composition, structure, properties and reactions of substances
  • Biology — living organisms: structure, function, evolution, ecology
  • Earth Science — geology (rocks/plates), meteorology (weather), oceanography
  • Astronomy — celestial bodies; cosmology; India's contribution via Aryabhata

4. India's Ancient Scientific Tradition

UPSC Connect

UPSC GS1 — Indian Heritage and Culture: India's scientific tradition is often underrepresented. Key points for Mains:

  • Pingala's binary system (~3rd century BCE) — the Chandahshastra encoded Sanskrit metre using a binary-like notation system; Leibniz is credited in Western science (1679 CE)
  • Aryabhata's heliocentric concepts — stated Earth rotates on its axis; calculated solar year as 365.25 days; worked in Kusumapura (modern Patna)
  • Sushruta performed rhinoplasty (nose reconstruction) — recognised by modern plastic surgeons as the world's first recorded surgical procedure
  • Charaka Samhita detailed clinical trials concept: test medicines on healthy individuals before sick — remarkably modern for 2nd century BCE
  • Zero — the concept of śūnya (void) formalised through Brahmagupta's Brahmasphutasiddhanta (628 CE) enabled modern mathematics, computing, and digital technology

5. Modern Indian Science — Institutions and Policy

ISRO (Indian Space Research Organisation)

  • Founded: 1969; Vikram Sarabhai is "Father of Indian Space Programme"
  • Chandrayaan-3 (Aug 23, 2023): landed Vikram lander and deployed Pragyan rover near Moon's South Pole — a global first; significance: polar region may hold water ice (resource for future missions)
  • Aditya-L1: stationed at Sun-Earth Lagrange Point 1 (~1.5 million km from Earth); uninterrupted view of Sun; studies solar corona (temperature paradox), solar flares (affect satellites, power grids)

Anusandhan NRF (National Research Foundation)

UPSC Connect

UPSC GS3 — Science and Technology Policy: The NRF Act 2023 established the Anusandhan National Research Foundation to seed, grow, and promote R&D across all disciplines — science, technology, and humanities. Key features:

  • Budget: ₹50,000 crore over 5 years (2023–28); mostly from private sector (government portion ~₹10,000 crore)
  • Modelled on US National Science Foundation (NSF)
  • Replaces SERB (Science and Engineering Research Board)
  • PM chairs the Governing Board
  • Aims to raise India's GERD (Gross Expenditure on R&D) from ~0.65% of GDP (one of lowest among emerging economies) to 2% of GDP
  • Critical link to UPSC Mains: India's low R&D intensity vs. China (2.4%), USA (3.5%), Israel (5.4%)

Atal Innovation Mission (AIM)

  • Under NITI Aayog; launched 2016
  • Atal Tinkering Labs (ATLs): 10,000+ labs in schools; promote STEM tinkering, problem-solving
  • Atal Incubation Centres (AICs): support startups
  • India: 3rd largest startup ecosystem globally; DPIIT recognises 1,97,692+ startups (as of October 2025; PIB)

Global Innovation Index (GII)

  • Published by WIPO annually
  • India's rank: 38th in GII 2025 (up from 39th in GII 2024 and 81st in 2015; WIPO); consistent improvement under government S&T push
  • India is top-ranked lower-middle-income economy and top in Central & Southern Asia; Bengaluru ranked 21st and Delhi 26th among global innovation clusters (GII 2025)

PM-STIAC: Prime Minister's Science, Technology and Innovation Advisory Council — apex advisory body; chaired by Principal Scientific Adviser to GoI.

Science, Technology and Innovation Policy (STIP 2020): India's current S&T policy framework — emphasis on decentralisation, open science, R&D investment, start-up ecosystem.

[Additional] 1a. Gaganyaan — India's Human Spaceflight Mission

The chapter covers ISRO milestones (Chandrayaan-3, Aditya-L1) but omits India's most consequential near-term space programme: Gaganyaan — India's first crewed spaceflight mission, which will make India the 4th nation to independently send humans to space. With the uncrewed mission now 90% complete and the crewed launch targeted for Q1 2027, Gaganyaan is a live science policy story directly relevant to science careers and national pride.

Key Term

Gaganyaan Mission Architecture:

MissionDescriptionTimeline
G1 (Gaganyaan-1)First uncrewed test flight carrying humanoid robot Vyommitra to verify life support, crew module, re-entry systemsH2 2026 target
G2 (Gaganyaan-2)Second uncrewed demonstration missionBefore crewed flight
H1 (Gaganyaan-H1)First crewed mission — 3 Indian astronauts to ~400 km orbit for 3 daysQ1 2027 target

Vyommitra: India's space-bound humanoid robot; mimics human body responses in microgravity; monitors cabin environment; tests systems before humans fly.

The four Gaganyaatri (astronauts-designate) — all IAF Group Captains/Wing Commanders:

  1. Group Captain Prasanth Balakrishnan Nair
  2. Group Captain Ajit Krishnan
  3. Group Captain Angad Pratap
  4. Wing Commander Shubhanshu Shukla

All four underwent 13 months of training in Russia (Gagarin Cosmonaut Training Centre) and are now in final phase at ISRO's Astronaut Training Facility, Bengaluru.

UPSC Connect

[Additional] Gaganyaan — India's Human Spaceflight Programme (GS3 — Science & Technology / Space Policy):

Mission status (May 2026):

  • Progress: Over 8,000 ground tests completed; 97% success rate; G1 mission 90% complete (ISRO Chairman V. Narayanan, 2026)
  • IADT-01 (Integrated Air Drop Test): Conducted 24 August 2025 — a dummy crew capsule (~4.8 tonnes) was dropped from 3 km altitude from an IAF Chinook helicopter over Bay of Bengal; recovery teams retrieved the capsule successfully. This tested the parachute, flotation, and sea-recovery systems
  • Crew Escape System (CES): One of the critical systems ensuring crew can escape in case of launch failure; tested successfully in earlier phases
  • TV-D1 (Test Vehicle Abort Mission-1): Successfully conducted October 21, 2023 — tested crew escape system at Mach 1.2, 11.9 km altitude; capsule splashed down safely in Bay of Bengal

Why Gaganyaan is scientifically significant:

  1. India will be only the 4th nation to independently launch humans to space — after USSR/Russia (1961), USA (1961), and China (2003)
  2. Enables India to run its own microgravity experiments — reducing dependence on NASA/Roscosmos missions
  3. Leads directly to Bharatiya Antariksh Station (BAS) — India's own space station planned by 2035
  4. Provides technology base for deep-space missions (Moon, Mars, beyond)

Gaganyaan's technology cascade:

  • Crew module (CM) reuses Chandrayaan capsule design experience
  • SpaDeX (Space Docking Experiment, December 2024) proved the rendezvous-docking technology that will be needed for BAS construction
  • Chandrayaan-4 (2028) sample return architecture uses the same re-entry capsule technology

UPSC synthesis: Gaganyaan is a 3-mission science-technology narrative: (1) Gaganyaan → crewed orbit → 4th independent spacefaring nation; (2) Bharatiya Antariksh Station by 2035 → India's own microgravity lab; (3) Moon by 2040 → long-term vision. Key exam facts: Vyommitra = humanoid robot for G1; IADT-01 = August 24, 2025; TV-D1 abort test = October 21, 2023; 4 astronaut-designates (all IAF officers); G1 uncrewed H2 2026; H1 crewed Q1 2027; 4th nation to independently send humans to space. ISRO Chairman: V. Narayanan (since January 14, 2025, succeeding S. Somanath).

[Additional] 1b. National Quantum Mission — India's ₹6,003 Crore Quantum Technology Push

The chapter covers space (ISRO), general R&D (ANRF, GERD) but entirely omits India's dedicated quantum technology programme — the National Quantum Mission (NQM) — which is the largest single science-technology programme after ANRF and directly shapes India's future in computing, cryptography, and national security. In April 2026, India achieved a landmark 1,000 km quantum key distribution network milestone — one of the world's longest.

Key Term

Quantum Technology — Core Concepts:

ConceptWhat It Means (Simplified)Why It Matters
Quantum superpositionA quantum bit (qubit) can be 0 AND 1 simultaneously (unlike classical binary bits)Quantum computers can explore many solutions at once — exponentially faster for certain problems
Quantum entanglementTwo qubits become "linked" — measuring one instantly determines the state of the other, regardless of distanceEnables unhackable quantum communication
Quantum Key Distribution (QKD)Using quantum physics to distribute encryption keys — any eavesdropping physically disturbs the transmission and is detectedNational-security-grade unbreakable encryption for defence, banking, critical infrastructure
Post-Quantum Cryptography (PQC)Encryption algorithms designed to resist attacks from future quantum computersProtects today's digital systems against tomorrow's quantum hackers

NQM's four technology verticals:

  1. Quantum Computing — T-Hub at IISc Bengaluru
  2. Quantum Communication — T-Hub at IIT Madras (with C-DoT)
  3. Quantum Sensing & Metrology — T-Hub at IIT Bombay
  4. Quantum Materials & Devices — T-Hub at IIT Delhi
UPSC Connect

[Additional] National Quantum Mission (NQM) — Policy, Progress, and Strategic Importance (GS3 — Science & Technology):

Key facts:

  • Cabinet approval: April 2023 (Union Cabinet; PIB PRID: Ministry of S&T)
  • Budget: ₹6,003.65 crore over 8 years (FY 2023-24 to FY 2030-31) — the largest government investment in a single science-technology vertical after ANRF
  • Nodal ministry: Ministry of Science and Technology (DST)
  • Governing body: Mission Governing Board chaired by Principal Scientific Adviser (PSA) to the Government of India

Four Thematic Hubs (T-Hubs) — established FY 2024-25:

T-HubHostFocus
Quantum ComputingIISc Bengaluru50-qubit computer (target: 1,000 qubit by 2031)
Quantum CommunicationIIT Madras + C-DoTQKD networks; quantum internet
Quantum Sensing & MetrologyIIT BombayAtomic clocks; navigation; medical imaging
Quantum Materials & DevicesIIT DelhiTopological qubits; novel quantum materials

1,000 km QKD milestone — April 2026:

  • In April 2026, NQM achieved a 1,000 km quantum key distribution (QKD) network using indigenous technology developed by NQM-supported startup QNu Labs — one of the longest QKD deployments in the world at this scale
  • The 8-year NQM target is a 2,000 km secure quantum communication backbone linking major Indian cities and critical infrastructure
  • QKD implementation protects defence communications, banking networks, and power grid SCADA systems against quantum-era decryption

India's quantum ecosystem:

  • 8 startups inducted under NQM's rolling startup cohort call (as of 2025)
  • Post-Quantum Cryptographic (PQC) standards being adopted for government systems
  • NQM links to the broader India–USA Initiative on Critical and Emerging Technology (iCET, January 2023) which includes joint quantum research partnerships

Global quantum race context:

  • China: worlds most advanced QKD network (~4,600 km backbone); quantum supremacy demonstrations
  • USA: National Quantum Initiative Act (2018), IBM/Google leading quantum hardware
  • EU: Quantum Flagship programme (€1 billion)
  • India's NQM positions India among the top 5 quantum-capable nations by 2031

UPSC synthesis: NQM is ANRF's science-infrastructure parallel — while ANRF funds all research, NQM makes a focused bet on quantum as a strategic technology. The four T-Hubs at IISc/IIT system connect university research to national security application. The 1,000 km QKD milestone (April 2026) is the current-affairs anchor. Key exam facts: NQM approved April 2023; ₹6,003.65 crore over 8 years; 4 T-Hubs (IISc, IIT Madras, IIT Bombay, IIT Delhi); 1,000 km QKD milestone April 2026 via QNu Labs; 2,000 km backbone target by 2031; QKD = quantum encryption that is physically unhackable. GS3 links: R&D policy + cryptography + national security + iCET (US-India relations, GS2).

Exam Strategy

Prelims traps:

  • Chandrayaan-3's South Pole landing is frequently tested; the lander is "Vikram," rover is "Pragyan" (same as Chandrayaan-2 rover names)
  • Aditya-L1 orbits at L1 (Lagrange Point 1), not L2 — do not confuse with JWST which is at Sun-Earth L2
  • NRF Act 2023 established Anusandhan NRF — the full name matters; budget is ₹50,000 crore over 5 years
  • GII rank: India is 38th (GII 2025), NOT in top 10 — a common distractor
  • Aryabhata: satellite name AND mathematician name — context matters
  • GERD (India ~0.65% GDP) is significantly below the 2% target — policy gap questions

Mains angles:

  • "Discuss India's progress in space technology and its strategic implications" — Chandrayaan-3, Aditya-L1, NavIC, commercial launch market
  • "Critically examine the role of NRF in transforming India's R&D ecosystem"
  • "India's ancient scientific tradition — myth or reality? Examine critically"

Practice Questions

Prelims:

  1. With reference to Chandrayaan-3 mission, which of the following statements is/are correct?
    (a) It was India's first mission to the Moon.
    (b) The lander successfully landed near the Moon's South Pole.
    (c) The lander is named Vikram and the rover is named Pragyan.
    (d) It was launched by GSLV Mk III on August 23, 2023.

  2. The Anusandhan National Research Foundation was established by:
    (a) A gazette notification under the SERB Act
    (b) An Act of Parliament in 2023
    (c) An executive order of the Cabinet
    (d) A NITI Aayog resolution

Mains:

  1. India's Global Innovation Index ranking has improved dramatically over the past decade. Examine the factors responsible for this improvement and the challenges that remain in transforming India into a global innovation hub. (CSE Mains 2024, GS Paper 3, 15 marks)
  2. "Science is a method, not a body of facts." In the context of evidence-based policymaking in India, critically examine how the scientific temper enshrined in Article 51A(h) of the Constitution can be strengthened. (CSE Mains 2023, GS Paper 4, 10 marks)