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Class 12th Cbse Boards

@CBSE_BOARDS_CLASS_12_2025
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Class 12th Cbse Boards

24 Oct, 16:36

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Forward from: PW LAKSHYA JEE 2025 BATCH
Organic Chemistry Handwritten Notes.pdf
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Organic Chemistry Full Chapter Notes

✨ Copyright ©️ Reserved to
JEE MAINS 2025
✨ Share with Credits

✈️ Telegram
 JEE MAINS 2025
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Class 12th Cbse Boards

24 Oct, 11:31

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🅰🅰🅰🅰🅰 🚨
~सुनो सुनो सुनो~, पढ़ो पढ़ो पढ़ो

CUET देना अच्छी बात है ❤️
लेकिन उसके लिए तैयारी नहीं करना ये तो अच्छी बात नहीं है 😭

Want to crack CUET-UG?
- You have the Key 🔐

Just fill the form given below and leave the rest to us.............

🟢Registration: https://forms.gle/gfdHzTMhpDQEkPzC9

🟢Group Link: https://chat.whatsapp.com/BjlcbUQNlgsFIcOVtusAEO

चेतावनी: आपके प्रयास यहाँ परास्त नहीं होंगे । ❤️
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Class 12th Cbse Boards

23 Oct, 18:03

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Class 12th Cbse Boards

18 Oct, 20:45

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Class 12th Cbse Boards

13 Oct, 18:45

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Class 12th Cbse Boards

12 Oct, 08:00

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Class 12th Cbse Boards

8 Oct, 15:56

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Class 12th Cbse Boards

6 Oct, 15:32

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Biomolecules Imp Q.pdf
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Biomolecules Important Questions❤️

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Class 12th Cbse Boards

3 Oct, 14:31

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Class 12th Cbse Boards

1 Oct, 14:31

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Aldehyde, Ketones & Carboxlyic Acid.pdf
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Aldehyde Ketone & Carboxylic Acid Important Questions❤️

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Class 12th Cbse Boards

29 Sep, 14:31

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Electromagnetic Waves.pdf
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Electromagnetic Waves Important Questions❤️

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Class 12th Cbse Boards

27 Sep, 10:17

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Chemistry Formula Booklet.pdf
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Chemistry Formula Booklet ❤️

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Class 12th Cbse Boards

25 Sep, 16:02

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Coordination Compounds.pdf
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Coordination Compounds Important Questions❤️

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24 Sep, 14:30

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22 Sep, 18:03

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25 Alternating current.pdf
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Alternating Current Handwritten Short Notes ❤️

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Class 12th Cbse Boards

21 Sep, 19:35

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Physics Derivations.pdf
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Physics Derivations ❤️

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Class 12th Cbse Boards

20 Sep, 15:30

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Modern Physics 2.pdf
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Modern Physics Handwritten Short Notes ❤️

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Class 12th Cbse Boards

19 Sep, 19:53

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Ray Optics.pdf
5.9Mb
Wave Optics.pdf
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Complete Optics Handwritten Short Notes ❤️

@Class12thCBSE_BOARDS_2025 💗
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Class 12th Cbse Boards

25 Aug, 13:46

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👍For session 2025-26 👍

➡️MATHS NOTES

➡️PHYSICS NOTES

➡️CHEMISTRY NOTES

▶️Biology Notes

Only 200 students will be allow to enter thn link will be revoke 📌
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Class 12th Cbse Boards

21 Aug, 20:00

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IMPORTANT Years In NCERT :-

1731 - Many people of Bishnoi community sacrifice their lives saving trees (Jodhpur)

1770 - Priestley's experiment by Bell Jar, Mice & Mint plant, Candle.

1774 - Discovery of oxygen by Joseph Priestley

1838 - Matthias Schleiden-Cell Theory                                                   

1829 - Theodore Schwann- Cell Theory

1850s -  Before industrialization => more white wing Moth

1854 - Julius von Sachs proved that glucose is formed in photosynthesis & stored as starch.

1855 - "Omnis cellula cellula" by Rudolf Virchow & complete the cell theory.

1856 - 1863 Mendel work on garden pea.

1860 - Hydroponics technique developed by Julie Von Sache

1865 - Mendel publishes his workon inheritance of character

1866 - Down's Syndrome discovered by Langdon Down.

1869 - DNA as a acidic substance was 1st identified by Friedrich Meischer & termed a "Nuclein"

1891 - Fossils of Java man discovered in Java
          - Henking discovered X-body (X-chromosome) in insect. (XO- type sex determination)

1892 - Discovery of TMV by D.J. Ivanowsky

1898 -  M.W. Beijerinck demonstrated infectious nature of TMV
          - Discovery of Golgi Body by Camillo Golgi.

1900 - Rediscovery of Mendel's work by ---> • Hugo de Vries
           • Karl Corrence
           • Tschemark

1902 - Chromosomal theory of inheritance given by Sutton & Bovery.

1905 - Law of limiting factors for plants given by Blackmann

1920 - After Industrialisation => more black moth

1928 - Frederick Griffith's Transformation  experiment on Streptococcus pneumonia bacteria

1933 – 1944 - Avery, Macleod McCarty used transformation principle of Griffith's experiment & concluded that DNA is genetic material.

1938 - Coelacanth/Lobe Fines caught in South Africa ---> Ancestor of amphibia.

1947 - At the time of our independence India's population, was approximately 350 million .

1950 -  Electron microscope invention
            -  Tissue culture started

1951 - Family planning was initiated

1952 - Hershey & Chase experiment more correctly proved that DNA ie genetic material [ unquivocal_proof ]

1953  - Discovery of ribosome by George Palade.
          - S.L Miller Experiment of evolution.
          - Double helical structure model of DNA given by Watson & Crick.

1958 - Matthew Meselson of Franklin Stahl experiment (E. coli in NH4CI medium) proved that DNA replication is semiconservative )
         -  Taylor study on vicia faba plant (used radioactive thymidind and proved  semiconservative nature of DNA)

1960 -  Green Revolution.

1963 - Restriction endonuclease isolated from E. coli.

1963 - Wheat varieties Sonalika f Kalyan Sona (High yield & Disease resistant ) introduced in INDIA

1966 - Derived semi dwarf varieties of rice introduced in India.

1969 - R.H. Whittaker proposed FIVE-KINGDOM Classification

1971 - Discovery of viroids by T.O. Diener
          -  Govt. of India legalised MTP.

1972 - Fluid Mosaic model of plasma membrane by Singer & Nicolson
          - 1st recombinant DNA developed by Stanley Cohen and Herbert Boyer
          - National committee for environmental planning and Coordination was established.
          - Wild life protection act in India.

1974 -  Water Act.  &  also Chipko movement

1980 -  Joint Forest movement

1981 - Air act.
           - AIDS was fired reported
           - Intrinsic growth rate of India (r= 0.0205) 

1983 - Eli Lilly American company human Insulin from E. coli.

1984 - Bhopal Tragedy
          - Ministry of Environment amd Forest.

1986 - Environment Act (NEPA)

1987 - Noise included in air pollution  
          - Montreal protocol (Canada)

1988 - National Forest Policy

1989 -  Montreal Protocol became effective.

1990 -  Delhi ranked 4th among 41 most polluted cities.

1990 - First clinical gene therapy was given to 14 yr old girl with ADA deficiency eye.
- Human Genome Project (HGP) launched.
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