What is biotechnology and what are its applications?

Biotechnology is the use of living organisms, cells, or their components to develop products and processes for human benefit. Applications: Agricultural biotechnology (GM crops, Bt cotton), Medical biotechnology (insulin production, vaccines, gene therapy), Industrial biotechnology (enzymes, biofuels), Environmental biotechnology (bioremediation). India has Bt cotton as a major GM crop.

What is nanotechnology?

Nanotechnology deals with materials and devices at the nanometer scale (1–100 nm; 1 nm = 10⁻⁹ m). Richard Feynman first proposed the concept in 1959; Richard Smalley, Harry Kroto, and Robert Curl won Nobel Prize (1996) for buckminsterfullerene (C60). Applications: Electronics (smaller chips), Medicine (drug delivery, cancer treatment), Materials (stronger, lighter materials), Solar cells.

What are the major Indian contributions to science and technology?

India's major contributions: Aryabhata (5th century CE) — concept of zero, decimal system, value of pi; Brahmagupta — rules of zero and negative numbers; C.V. Raman — Raman Effect (Nobel Prize 1930); S.N. Bose — Bose-Einstein statistics (Bosons); Homi Bhabha — nuclear science; Vikram Sarabhai — space science; A.P.J. Abdul Kalam — missile technology.

Science, Technology and Inventions — TNPSC Group II/IIA Science

Overview

TNPSC Group 2/2A tests knowledge of important scientists, their discoveries, key inventions, and modern technologies. This chapter covers landmark inventions in science history, Indian scientists, and emerging technologies like biotechnology, nanotechnology, and IT.

Key Scientific Discoveries

Physics

Discovery/Invention	Scientist	Year
Laws of Motion	Isaac Newton	1687
Universal Gravitation	Isaac Newton	1687
Electromagnetic Induction	Michael Faraday	1831
Theory of Relativity	Albert Einstein	1905/1915
Discovery of Electron	J.J. Thomson	1897
Discovery of Proton	Ernest Rutherford	1919
Discovery of Neutron	James Chadwick	1932
Nuclear Fission	Otto Hahn, Fritz Strassmann	1938
Raman Effect	C.V. Raman	1928
Bose-Einstein Statistics	S.N. Bose, Einstein	1924
Quantum Mechanics	Heisenberg, Schrödinger	1920s

Chemistry

Discovery/Invention	Scientist	Year
Periodic Table	Dmitri Mendeleev	1869
Oxygen	Joseph Priestley	1774
Radioactivity	Henri Becquerel	1896
Polonium and Radium	Marie Curie	1898
Penicillin (Antibiotic)	Alexander Fleming	1928
Aspirin	Felix Hoffmann (Bayer)	1897

Biology

Discovery/Invention	Scientist	Year
Evolution by Natural Selection	Charles Darwin	1859
Cell Theory	Schleiden, Schwann	1838–39
Laws of Heredity	Gregor Mendel	1866
DNA Double Helix	Watson, Crick, Franklin	1953
Human Genome Project	International collaboration	2003
Discovery of Insulin	Frederick Banting, Charles Best	1921
Polio Vaccine	Jonas Salk	1955

Key Inventions

Invention	Inventor	Year	Country
Steam Engine	James Watt	1769	UK
Electric Bulb	Thomas Edison	1879	USA
Telephone	Alexander Graham Bell	1876	USA/Canada
Radio	Guglielmo Marconi	1895	Italy
Television	John Logie Baird	1926	UK
Aeroplane	Wright Brothers	1903	USA
Printing Press	Johannes Gutenberg	c.1440	Germany
World Wide Web	Tim Berners-Lee	1989	Switzerland (CERN)
Penicillin	Alexander Fleming	1928	UK
X-ray	Wilhelm Röntgen	1895	Germany
Radar	Robert Watson-Watt	1935	UK
Laser	Theodore Maiman	1960	USA
Transistor	Bardeen, Brattain, Shockley	1947	USA (Bell Labs)
Integrated Circuit (Chip)	Jack Kilby, Robert Noyce	1958–59	USA

Nobel Prizes in Science (Key Indians)

Name	Prize	Year	Discovery/Work
C.V. Raman	Physics	1930	Raman Effect — scattering of light
Har Gobind Khorana	Medicine	1968	Genetic code; first synthetic gene
Subrahmanyan Chandrasekhar	Physics	1983	Chandrasekhar limit (white dwarfs)
Amartya Sen	Economics	1998	Welfare economics, development theory
Venkatraman Ramakrishnan	Chemistry	2009	Structure of ribosome
Abhijit Banerjee	Economics	2019	Experimental approach to poverty alleviation
Satya Nadella	Business leader	—	CEO of Microsoft

C.V. Raman — Tamil Nadu Connection

Born: Tiruchirapalli, Tamil Nadu (November 7, 1888)
Discovered the Raman Effect — when light scatters off molecules, some photons change frequency
Nobel Prize: 1930 (Physics) — first Asian and first Indian to win Nobel in science
National Science Day: February 28 (date of Raman Effect discovery, 1928)

Indian Scientists and Mathematicians

Scientist	Field	Contribution
Aryabhata (476–550 CE)	Mathematics/Astronomy	Decimal system, value of π (3.1416), Earth's rotation
Brahmagupta (598–668 CE)	Mathematics	Rules of zero, negative numbers
Ramanujan (1887–1920)	Mathematics	Prime numbers, infinite series; Cambridge; Hardy collaboration
C.V. Raman (1888–1970)	Physics	Raman Effect; Nobel Prize 1930
S.N. Bose (1894–1974)	Physics	Bose-Einstein statistics; Bosons named after him
Homi Bhabha (1909–1966)	Nuclear Physics	Father of Indian nuclear programme
Vikram Sarabhai (1919–1971)	Space Science	Father of Indian Space Programme; ISRO founder
A.P.J. Abdul Kalam (1931–2015)	Aerospace/Missiles	PSLV, AGNI, PRITHVI missiles; "Missile Man"; 11th President

Indian Mathematics — Ancient Contributions

Aryabhata (5th century CE)

Zero: Concept of zero and place value system
Decimal system: Positional notation
Value of π: 62832/20000 = 3.1416 (accurate to 4 decimal places)
Earth's rotation: Earth rotates on its axis (not Sun around Earth)
Solar/Lunar eclipses: Explained scientifically (not due to demons)
Aryabhata satellite: India's first satellite (1975) named after him

Srinivasa Ramanujan (1887–1920)

Born: Erode, Tamil Nadu (December 22, 1887)
Self-taught mathematical genius
Collaborator: G.H. Hardy (Cambridge)
Contributions: Number theory, partition functions, infinite series
Ramanujan's notebooks: Contained theorems still being proved today
Ramanujan Number: 1729 (smallest number expressible as sum of two cubes in two ways: 1³+12³ = 9³+10³)
National Mathematics Day: December 22 (his birthday)

Information Technology Revolution

History of Computing

Event	Year	Significance
First programmable computer	1936	Alan Turing's theoretical work
First electronic computer (ENIAC)	1945	USA; filled a room
Transistor invented	1947	Smaller electronic components
Integrated Circuit	1958–59	Multiple transistors on a chip
First microprocessor (Intel 4004)	1971	Computer-on-a-chip
Personal Computer (IBM PC)	1981	Computers for everyone
World Wide Web	1989	Tim Berners-Lee; CERN
Internet in India	1995	Videsh Sanchar Nigam Limited
UPI (India)	2016	Real-time digital payments

India's IT Industry

Feature	Details
IT capital	Bengaluru (Silicon Valley of India)
Other IT hubs	Hyderabad, Chennai, Pune, Noida, Mumbai
Key companies	TCS, Infosys, Wipro, HCL, Tech Mahindra
IT exports	~$250 billion (2023–24)
Employment	~5 million directly
Tamil Nadu's IT hub	Chennai; OMR (Old Mahabalipuram Road) = "IT Corridor"

Biotechnology

Definition and Types

Use of living organisms/biological systems for practical purposes

Branch	Applications
Agricultural biotech	Bt cotton (insect resistant), GM crops, biofertilizers
Medical biotech	Recombinant insulin, vaccines, monoclonal antibodies, CRISPR
Industrial biotech	Enzymes, biofuels, biodegradable plastics
Environmental biotech	Bioremediation (oil spill cleanup using bacteria)

Bt Cotton in India

First GM crop approved in India (2002)
Contains Bacillus thuringiensis (Bt) gene — produces protein toxic to bollworm
India's cotton production doubled after Bt cotton adoption
Controversies: Impact on non-target insects, farmer debt

Nanotechnology

Aspect	Details
Scale	1–100 nanometers (1 nm = 10⁻⁹ m)
Coined by	Norio Taniguchi (1974)
Key pioneer	Richard Feynman proposed concept in 1959
Nobel Prize	Smalley, Kroto, Curl (1996) for Buckminsterfullerene (C60)

Applications

Electronics: Nanochips; faster, smaller devices
Medicine: Targeted drug delivery (nanoparticles to cancer cells); nanosensors
Materials: Carbon nanotubes (stronger than steel, lighter)
Energy: Better solar cells, batteries
Environment: Nanofiltration for water purification

Key Facts for TNPSC Group II/IIA

C.V. Raman: Born in Tiruchirapalli, TN; Nobel Prize 1930 (Physics); Raman Effect; National Science Day: February 28
Ramanujan: Born in Erode, TN (December 22, 1887); National Mathematics Day: December 22
Aryabhata: Decimal system, zero concept, value of π (5th century CE); India's first satellite named after him
A.P.J. Abdul Kalam: Born in Rameswaram, Tamil Nadu; "Missile Man"; 11th President
Alexander Fleming: Penicillin (1928); first antibiotic; Nobel Prize 1945
Watson and Crick: DNA double helix (1953); Nobel Prize 1962
WWW (World Wide Web): Tim Berners-Lee, 1989, CERN, Switzerland
India's IT: Bengaluru is Silicon Valley; TCS, Infosys, Wipro — top companies
Bt cotton: India's first and only approved GM crop; since 2002
Nanotechnology: 1–100 nm scale; applications in medicine, electronics, energy

Previous Year MCQ Patterns

Q: National Science Day in India is celebrated on: a) November 7 b) February 28 c) October 15 d) December 22

Answerb) February 28 — National Science Day is celebrated on February 28, the anniversary of C.V. Raman's discovery of the Raman Effect in 1928. Raman won the Nobel Prize in Physics in 1930 for this discovery. He was the first Indian and first Asian to win a Nobel Prize in science.

Q: The first Indian to win the Nobel Prize in Science was: a) Homi Bhabha b) Vikram Sarabhai c) C.V. Raman d) S.N. Bose

Answerc) C.V. Raman — C.V. Raman (Sir Chandrasekhara Venkata Raman) won the Nobel Prize in Physics in 1930 for discovering the Raman Effect (inelastic scattering of light). He was born in Tiruchirapalli, Tamil Nadu. National Science Day (February 28) is celebrated on the day he announced his discovery in 1928.

Q: India's first genetic modification (GM) crop approved for commercial cultivation is: a) Golden Rice b) Bt Brinjal c) Bt Cotton d) GM Wheat

Answerc) Bt Cotton — Bt Cotton was India's first GM crop approved for commercial cultivation in 2002 by the Genetic Engineering Appraisal Committee (GEAC). It contains a gene from the bacterium Bacillus thuringiensis (Bt) that produces a protein toxic to bollworm pests, reducing pesticide use.

Frequently Asked Questions

Alexander Graham Bell invented the telephone in 1876. He received the patent on March 7, 1876. The first words spoken on telephone were 'Mr. Watson, come here, I want to see you' (to his assistant Thomas Watson). Elisha Gray had simultaneously developed a similar device but Bell filed the patent first.