Class 10th 11 12th Science Notes

Padhai toh karte hain yaar 😩 Videos dekhte hain, notes revise karte hain, questions bhi solve karte hain… Phir test aate hi marks expected se kam kyun? Kya hum padhne mein galti kar rahe hain, ya padhne ka tareeka hi galat hai?👀

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🌟 Important Points of NCERT 🌟 1. 1770 : Joseph Priestley - Essential role of air in growth of green plant. 2. 1774 : Joseph Priestley - Discovered O2. 3. 1831 : Robert Brown - Ist discovered and described nucleus. 4. 1838 : Schleiden (German Botanist) - Work on plants. 5. 1839 : Schwann(British Zoologist) - Work on both plants & animals. 6. 1855 : Rudolf Virchow - Omnis cellula-e-cellula (cells arises from pre-existing cells). 7. Life originate from pre-existing life : Pasteur (Yeast). 8. Life originate from non-living (decaying & rotting matter) : Spontaneous generation. 9. Life originate from pre-existing non-living organic molecules (RNA, Protein)- Oparin (Russia) & Haldane (England)- Chemical Evolution. 10. : Mendal experiment on garden pea. (7 years) 11. 1860 : Julius von Sachs - Developed hydroponics. 12. 1865 : Mendal published his work. 13. 1866 : Langdon Down - Down’s syndrome. 14. 1869 : Friedrich Meischer - Ist identified DNA and named it nuclein. 15. 1891 : Henking - Discovered X-body. 16. 1891 : Fossil discovered in Java - Homo erectus. 17. 1892 : Ivanowsky - Discovered virus. 18. 1898 : Beijerinek - Contagium vivum fluidum (infectious living fluid). 19. 1898 : Camillo Golgi - Discovered (observed) G.B. 20. 1900 : de Vries, Corre ns and von Tsche rmak inde pende ntly rediscovered Mendel’s results. 21. 1902 : Chromosome movement during meiosis has been worked out. 22. 1905 : Law of limiting factor (Blackmann). 23. 1928 : Fredrick Griffith - Transforming experiment with Streptococcus pneumoniae (Diplococcus). 24. 1935 : Stanley - Crystallised viruses. 25. 1937 : Ramde o Misra obtained Ph.D. in Ecology from Lee ds university (U.K.). 26. 1938 : Coelocanth fish caught in South Africa. 27. 1945 : Fleming, Chain & Florey - Awarded Nobel prize. 28. 1950 : Watson obtained Ph.D. on a study of the effect of hard X-rays on bacteriophage multiplication. 29. 1951 : Family planning programme started in India. 30. 1952 : Hershey & Chase-experiment on bacteriophage or Bacterial virus gives unequivocal proof that DNA is the genetic material. 31. 1953 : Miller experiment - Methane, ammonia, hydrogen & water vapour. 32. 1953 : Watson & Crick - Double helical structure of B-DNA & replication scheme. 33. 1953 : Palade : Discovered ribosome. 34. 1954 : Ramachandran - Triple helical model of collagen, published in Nature. 35. 1954 : Crick complete d Ph.D. on a thesis “X-rays diffraction : polypeptides and proteins. 36. 1958 : Meselson & Stahl - Work on E.coli proves semiconservative replication of DNA in prokaryotes. 37. 1958 : Taylor - Work on Vicia faba proves semiconservative replication of DNA in eukaryotes. 38. 1960 : Katherine Esau - Published “Anatomy of Seed Plants.” 39. 1961 : Melvin Calvin - Nobel Prize. 40. 1962 : Watson, Crick and Wilikins - Nobel Prize. 41. 1963 : Wheat varieties (Sonalika & Kalyan sona) introduced. 42. 1963 : Two enzyme responsible for restricting growth of bacteriophage in E.coli were isolated. 43. 1966 : Derivative of IR-8 & Taichung native-I introduced. 44. 1969 : Whittaker - Five kingdom classification. 45. 1971 : Govt. of India legalized MTP. 46. 1971 : Diener- Discovered Viroid(free RNA without capsid). 47. 1972 : Singer & Nicolson - Fluid mosaic model. 48. 1972 : Stanley Cohen & Herbert Boyer - Formed Ist recombinant DNA. 49. 1972 : Establishme nt of NCEPC - National Committe e for Environmental Planning & Coordination. 50. 1974 : Water act. 51. 1980 : Joint forest management, (JFM). 52. 1981 : AIDS was Ist reported. 53. 1981 : Air act. 54. 1983 : Eli Lily (An American company) produces insulin in E.coli by recombinant DNA technology. 55. 1984 : Establishment of MOEF : Ministry of Environment & Forest. 56. 1986 : Environment Protection Act. 57. 1987 : Montreal protocol. Held in Montreal, Canada. 💐 Share & React ❤️ below. Join For More *https://whatsapp.com/channel/0029Va9492L3QxRv5MtNFF0Y*

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