JEEMAIN.GURU| JEE materials download

2021-08-07 18:00:09 Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi
Milenge PDFs , Latest News , Previous Year Papers , Free Live Classes & aur bhi bhot kuch.

Abhi join karein Doubtnut , Official Telegram Channel ko!! -

Doubnut Official Channel
https://t.me/Doubtnut

Doubtnut IIT-JEE
https://t.me/DoubtnutIITJEE ओपन / कमेंट

2021-08-07 13:57:25 NEET 2021 is NEAR Be NEET Ready
with Snapsolve Doubt Genie

Hurry Solve all Your NEET PCB
Doubts with Snapsolve Doubt Genie
on Telegram https://t.me/snapsolve_bot?start=source_bot100
https://t.me/snapsolve_bot?start=source_bot100


Get a Top Rank in NEET 2021 ओपन / कमेंट

2021-08-07 08:38:41 TOPIC -Chemical Kinetics

Handwritten notes
━━━━━━━━━━━━━━━━━━━━ QUICK REVISION ओपन / कमेंट

2021-08-06 19:03:23 Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi
Milenge PDFs , Latest News , Previous Year Papers , Free Live Classes & aur bhi bhot kuch.

Abhi join karein Doubtnut , Official Telegram Channel ko!! -

Doubnut Official Channel
https://t.me/Doubtnut

Doubtnut NEET
https://t.me/Doubtnut_NEET ओपन / कमेंट

2021-08-06 16:01:27 𝚂𝚘𝚖𝚎 𝙸𝚖𝚙𝚘𝚛𝚝𝚊𝚗𝚝 𝙲𝚘𝚗𝚗𝚎𝚌𝚝𝚒𝚗𝚐 𝚕𝚒𝚗𝚔𝚜 𝚋𝚎𝚝𝚠𝚎𝚎𝚗 𝙶𝚛𝚘𝚞𝚙𝚜 : ---


1. Bacteria & Fungi
Actinomycetes

2. Reptiles & Birds
Archaeopteryx

3. Chordates & Non-chordates
Balanoglossus

4. Cartilaginous & Bony fishes
Chimera (Rabbit fish/Ratfish)

5. Bryophytes & Pteridophytes
Club moss

6. Coelenterates & Platyhelminthes
Ctenophora

7. Pteridophytes & Gymnosperms
Cycas

8. Reptiles & Mammals
Echidna (Spiny ant eater)

9. Animals & Plants
Euglena

10. Gymnosperms & Angiosperms
Gnetum

11. Protista & Bryophytes
Hornworts

12. Pisces & Amphibia
Latimeria

13. Protista & Fungi
Myxomycetes

14. Annelida & Mollusca
Neopilina

15. Reptiles & Mammals
Ornithorhynchus (Duck billed platypus)

16. Annelida & Arthropoda
Peripatus (walking worm)

17. Protozoa & Porifera
Proterospongia

18. Bony fishes & Amphibia
Protopterus (Lung fishes)

19. Virus & Bacteria
Rickettsia

20. Amphibia & Reptiles
Seymouria

21. Amphibia & Reptilia
Sphenodon (Living fossil lizard)

22. Echinodermata & Chordata
Tornaria larva

23. Annelida & Mollusca
Trochophore larva

24. Living & non-living
Virus

25. Protozoa & Metazoa
Xenoturbella ओपन / कमेंट

2021-08-06 15:57:30 Doubtnut par abhi Cash On Delivery mai bhi course le sakte ho

Abhi try kare

Jyada jaankari ke liye :

https://doubtnut.app.link/VErGRIT2rhb ओपन / कमेंट

2021-07-29 13:54:16 Algebra - Revision Notes on Permutations

The concept of permutation is used for the arrangement of objects in a specific order i.e. whenever the order is important, permutation is used.

The total number of permutations on a set of n objects is given by n! and is denoted as nPn = n!

The total number of permutations on a set of n objects taken r at a time is given by nPr = n!/ (n-r)!

The number of ways of arranging n objects of which r are the same is given by n!/ r!

If we wish to arrange a total of n objects, out of which ‘p’ are of one type, q of second type are alike, and r of a third kind are same, then such a computation is done as n!/p!q!r!

Al most all permutation questions involve putting things in order from a line where the order matters. For example ABC is a different permutation to ACB.

The number of permutations of n distinct objects when a particular object is not to be considered in the arrangement is given by n-1Pr

The number of permutations of n distinct objects when a specific object is to be always included in the arrangement is given by r.n-1Pr-1.

If we need to compute the number of permutations of n different objects, out of which r have to be selected and each object has the probability of occurring once, twice or thrice… up to r times in any arrangement is given by (n)r.

Circular permutation is used when some arrangement is to be made in the form of a ring or circle.

When ‘n’ different or unlike objects are to be arranged in a ring in such a way that the clockwise and anticlockwise arrangements are different, then the number of such arrangements is given by (n – 1)!

If n persons are to be seated around a round table in such a way that no person has similar neighbor then it is given as ½ (n – 1)!

The number of necklaces formed with n beads of different colors = ½ (n – 1)!

nP0 =1

nP1 = n

nPn = n!/(n-n)! = n! /0! = n! /1= n! ओपन / कमेंट

2021-07-29 12:21:26 NEET & JEE ke most important videos
अभी इन्हे देखो और करलो अपनी तैयारी पक्की |

NEET 2021 - Parth Sir -



JEE 2021 - Most important questions -



NCERT - Dimensional Analysis -



DOUBTNUT Youtube Channel - https://youtube.com/c/Doubtnut ओपन / कमेंट

2021-07-28 16:52:53 Important Points For NEET

Evidences from comparative morphology and anatomy :-

Examples of homologous organs:

(i) Forelimbs of mammals
(ii) Thorn of Bougainvillea and tendril of Cucurbita both are modification of axillary bud.
(iii)Vertebrate hearts or brains
(iv)Mouth parts of insects :
Cockroach Honey bee Mosquito
(Biting & chewing) (Chewing & lapping) (Piercing & Sucking)
(v) Testes in male and ovaries in female
(vi) Potato and Ginger - both are modified shoot
(vii) Radish and Carrot - both are modified roots

Examples of Analogous organs :

(i) Wings of butterfly and birds
(ii) Eye of the octopus and of mammals
(iii) Flippers of Penguins and Dolphins
(iv) Sweet potato (root modification) and potato (stem modification)
(v) Sting of bee and scorpion
(vi) Chloragogen cells of earthworm and liver of vertebrates ओपन / कमेंट

2021-07-27 13:45:06 Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi
Milenge PDFs , Latest News , Previous Year Papers , Free Live Classes & aur bhi bhot kuch.

Abhi join karein Doubtnut , Official Telegram Channel ko!! -

Doubnut Official Channel
https://t.me/Doubtnut

Doubtnut IIT-JEE
https://t.me/DoubtnutIITJEE ओपन / कमेंट