🌟 IMPORTANT YEARS IN NCERT 🌟
1731 – Bishnoi community sacrifices lives to save trees 🌳 (Jodhpur)
1770 – Priestley’s experiment (Bell Jar, Mice 🐭, Mint 🌱, Candle 🕯)
1774 – Joseph Priestley discovers Oxygen (O₂)
1838 – Matthias Schleiden: Cell Theory 📜
1829 – Theodore Schwann: Cell Theory 📜
1850s – Pre-industrialization: White-wing moth dominant
1854 – Julius von Sachs: Glucose formation during photosynthesis 🍃
1855 – Virchow: “Omnis cellula e cellula” completes Cell Theory
1856–1863 – Mendel’s work on Garden Pea 🌿
1860 – Hydroponics developed by Julie Von Sache 🌱
1865 – Mendel publishes work on Inheritance 🧬
1866 – Down's Syndrome discovered
1869 – DNA first identified as ‘Nuclein’ by Friedrich Meischer
1891 – Java man fossils discovered 🦴
1892 – Discovery of TMV by D.J. Ivanowsky 🌿
1898 – Beijerinck demonstrates TMV infectious nature 🌱
Discovery of Golgi Body by Camillo Golgi 🧫
1900 – Rediscovery of Mendel’s work
1902 – Chromosomal theory of inheritance 🧬
1920 – Post-industrialization: Black moth dominant
1928 – Griffith’s Transformation experiment 🦠
1933–1944 – Avery, MacLeod, McCarty confirm DNA as genetic material
1938 – Coelacanth caught in South Africa 🐟
1947 – India’s population ~350 million 🌍
1950 – Electron microscope invented 🔬
1951 – Family planning initiated 👨👩👧
1952 – Hershey & Chase: DNA is genetic material 🧬
1953 – Watson & Crick: Double-helix DNA model 🧬
1958 – Meselson & Stahl: Semiconservative DNA replication 🧬
1960 – Green Revolution 🌾
1963 – High-yield wheat varieties introduced 🌾
1966 – Semi-dwarf rice varieties introduced 🌾
1969 – Whittaker proposes Five-Kingdom Classification
1971 – Viroids discovered 🦠
1972 – Fluid mosaic model of plasma membrane 🧬
1974 – Chipko Movement 🌳
1980 – Joint Forest Movement 🌳
1981 – Air Act 🚭
AIDS first reported
1983 – Human Insulin from E. coli by Eli Lilly
1984 – Bhopal Gas Tragedy 🏭
1986 – Environmental Protection Act 🌍
1987 – Montreal Protocol 🌍
1988 – National Forest Policy 🌳
1990 – Human Genome Project launched 🧬
