.

2021-08-28 10:55:51 Very Important Points, Must read once

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.

Trick and Mnemonics
Biology Open / Comment

2021-08-27 15:30:46 Preparation kasi chal rha bachoo..!!! Open / Comment

2021-08-26 12:27:13 Periodic Table Chemistry Tricks -

Group 1 - Lina Kare Rab Se Fariyad
Elements - Li, Na, K, Rb, Cs, Fr

Group 2 - Beta Mange Cars Saari Baap Roye
Elements - Be, Mg, Ca, Sr, Ba, Ra

Group 13 - Bengan, Aaloo, Gazar In Thella
Elements - B, Al, Ga, In, Tl

Group 14 - Chemistry Sir Gives Sanki Problems.
Elements - C, Si, Ge, Sn, Pb

Group 15 - Nepal Pakistan Australia Sab Bikhari (No offence!!)
Elements - N, P, As, Sb, Bi

Group 16 - Old Style Se Tepo
Elements - O, S, Se, Te, Po

Group 17 - Fir Call kar Bahaar AayI Aunty
Elements - F, Cl, Br, I, At

Group 18 - Heena Neena Aur Kareena Xenath Rangeen
Elements - He, Ne, Ar, Kr, Xe, Rn

D blocks elements -

Esi TV Corporation Mange Fir raha hein, Koi Ni Kuch nahi Janta
Elements - Sc, T, V, Cr, Mn, Fe, Co, Ni, Cu, Zn Open / Comment

2021-08-26 11:32:53

Open / Comment

2021-08-25 17:25:20   Ecological succession

 

(i) Xerarch succession/Terrestrial environment.

Large MAPS Collection.

  Explanation

Lichens, Mosses, Annual grasses, Perennial grasses, Shrubs
, Climax community.

 

(ii)Hydrarch succession/Aquatic environment.

Pretty Starlets Feel Shy of Males with Charisma.

 Explanation

Plankton, Submerged plants, Floating plants, Swamps, Marshy meadow, Climax community.

▬ ▬ ▬ ▬ ▬ ▬ ▬ ▬ ▬ ▬

Trick and Mnemonics
Biology Open / Comment

2021-08-25 17:25:01 :


Open / Comment

2021-08-20 12:29:47 Important NCERT Picks of the Chapter "The Living World"

Nomenclature
• Binomial nomenclature system given by Carolus Linnaeus. Each name has two components – the generic name and the specific epithet.

• We know the plants and animals in our own area by their local/ vernacular names but these local names would vary from place to place, even within a country that can create a lot of confusion. Thus, it is a need to standardize the naming of living organisms such that a particular organism is known by the same single name all over the world.

• Nomenclature or naming is only possible when the organism is described correctly and we know to
what organism the name is attached to. This is called identification.

• Tautonyms: If both generic and specific names are same,
these are called tautonyms. e.g., Rattus rattus

• Nomenclature: Standardize the naming of living organisms

For Naming of Plants
International Code for Botanical Nomenclature (ICBN).

For Naming of Animals
International Code of Zoological Nomenclature (ICZN). Open / Comment

2021-08-20 11:37:08 Itne Questions ki khatam he ni hote Tension Not

One Stop for your UNLIMITED Questions

Just find Snapsolve Doubt Genie on Telegram for and get Solutions to all your PCMB Doubts in an instant
https://t.me/snapsolve_bot?start=source_bot38 Open / Comment

2021-08-18 16:17:57 Some Gaseous Fuels :

(a) Water gas or syn gas = CO + H2

(b) Producer gas = CO + N2

(c) Semi water gas = CO + N2 + H2

(d) Natural gas = CH4

(e) Coal gas = CO2 + CO + H2 + CH4 Open / Comment