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The latest Messages 19
2021-07-29 17:41:53
#MOSTimp Questions oriented points for neet 2021
Learn it #FROMNCERT
1.2K views14:41
2021-07-29 17:21:06
#TRICKS #FUNCTION OF #SERTOLIC_CELLS #NCERT
BIMA PENS
1) B- blood testis barrier .
2) I - inhibits hormone secretion (FSH).
3) M- mullerian inhibiting substance .
4) A - androgen binding protein synthesis .
.
5) P- phagocytosis of dead or abnormal sperm.
6) E - estrogen synthesis .
7) N- nourishment of sperm
8) S - spermiation
.
1.2K views14:21
2021-07-28 19:56:57
#COMPLETE #Chemical_Properties of #Alkali Earth Metals:
#FROMNCERT
1. Reaction with water :
Mg + H2O → MgO + H2
or, Mg + 2H2O → Mg (OH)2 + H2
Ca + 2H2O → Ca(OH)2 + H2
2. Formation of oxides and nitrides
Be + O2 (air) +Δ→ 2BeO
3Be + N2 (air) +Δ → Be3N2
Mg + air + Δ → MgO + Ng3N2
3. Formation of Nitrides
3M + N2 + Δ → M3N2
Be3N2 + Δ → 3Be + N2
Ba3N2 + 6H2O + Δ → 3Ba (OH)2 + 2NH3
Ca3N2 + 6H2O + Δ → 3Ca (OH)2 + 2NH3
4. Reaction with hydrogen:
M + H2 + Δ → MH2
Both BeH2 and MgH2 are covalent compounds having polymeric structures in which H – atoms between beryllium atoms are held together by three
centre – two electron (3C - 2e) bonds as shown below:
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5. Reaction with carbon – (Formation of carbides)
When BeO is heated with carbon at 2175 – 2275 K a brick red coloured carbide of the formula Be2C is formed
2BeO +2C \xrightarrow[]{2175 - 2275 K}Be_2C +2CO
It is a covalent compound and react water forming methane.
Be2C + 4H2O → 2Be (OH)2 + CH4
6. Reaction with Ammonia:
Like alkali metal, the alkaline earth metals dissolve in liquid ammonia to give deep blue black solution from which ammoniates [ M (NH3)6 ]2+ can be recovered.
Anamolous Behaviour of Beryllium:
Be is harder than other members of its group.
Be is lighter than Mg.
Its melting and boiling points are higher than those of Mg & other members.
Be does not react with water while Mg reacts with boiling water.
BeO is amphoteric while MgO is weakly basic.
Be forms covalent compounds whereas other members form ionic compounds.
Beryllium carbide reacts with water to give methane whereas carbides of other alkaline earth metals gives acetylene gas.
Be2C + 4H2O → 2Be (OH)2 + CH4
Mg2C2 + 2H2O → Mg (OH)2 + C2H2
CaC2 + 2H2O → Ca (OH)2 + C2H2
Beryllium does not exhibit coordination number more than four as it has four orbitals in the valence shell. The other members of this group has coordination number
Diagonal relationship of Be with Al:
Unlike groups – 2 elements but like aluminium, beryllium forms covalent compounds.
The hydroxides of Be, [Be(OH)2] and aluminium [Al(OH)3] are amphoteric in nature, whereas those of other elements of group – 2 are basic in nature.
The oxides of both Be and Al i.e. BeO and Al2O3 are high melting insoluble solids.
BeCl2 and AlCl3 have bridged chloride polymeric structure.
The salts of beryllium as well as aluminium are extensively hydrolysed.
Carbides of both the metal reacts with water liberating methane gas.
Be2C + 4H2O → 2Be (OH)2 + CH4
AI4C3 + 12H2O → 4Al (OH)3 + 3CH4
The oxides and hydroxides of both Be and Al are amphoteric and dissolve in sodium hydroxide as well as in hydrochloric acid.
BeO + 2HCI → BeCI2 + H2O
BeO + 2NaOH → Na2BeO2 + H2O
Al2O3 + 6HCI → 2AICI3 + H2O
AI2O3 + 2NaOH → 2NaAIO2 + H2O
Like Al, Be is not readily attacked by acids because of the presence of an oxide film.
Calcium Carbonate (CaCO3):
It occurs in nature as marble, limestone, chalk, coral, calcite, etc. It is prepared as a white powder, known as precipitated chalk, by dissolving marble or limestone in hydrochloric acid and removing iron and aluminium present by precipitating with NH3, and then adding ammonium carbonate to the solution; the precipitate is filtered, washed and dried.
CaCl2 + (NH4)2CO3 →CaCO3 + 2NH4Cl
It dissolves in water containing CO2, forming Ca(HCO3)2 but is precipitated from solution by boiling.
CaCO3 + H2O + CO2 Ca(HCO3)2
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1.5K viewsedited 16:56
2021-07-28 17:22:52
#MOSTImportant Points of the Chapter "Transport in Plants"
#NCERT #NEET2021
Most accepted theory of opening and closing of stomata:
Active Potassium transport theory, Proposed by” Levitt.
Maximum opening of stomata occurs in blue light followed by red light.
Cytokinin helps in stomata opening & ABA closing of stomata.
Antitranspiratants agents: Colourless plastic, Silicone oil, Phenymercuric acetate, ABA and CO2.
Field capacity: Maximum water holding capacity of soil. Clay soil has highest.
Holard: Amount of total water present in the soil.
DPD of pure Water is lowest and concentrated solution is highest DPD.
Root Pressure theory was given by Stephen hales (Father of Plant Physiology).
In girdling experiment, root die first.
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Guttation: it is the process of loss of water in the form of droplets through the hydathodes.
Hydathodes: Special opening of veins near the tip of grass blades, and leaves of many herbaceous parts.
Cohesion: Mutual attraction between water molecules.
1.2K viewsedited 14:22
2021-07-28 15:28:26
#MOSTimp Points For #NEET 2021 #FROMNCERT
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.
1.2K views12:28
2021-07-28 12:05:18
#MOSTimp functional components of the thalamus #NCERT
Sensory nuclei responsible for all sensory domains (olfaction is an exception)
Intralaminar and reticular nuclei handling arousal and pain sensation
Associative nuclei implying cognitive roles
Limbic nuclei comprehending motivation and mood
Effector nuclei administering motor language functions
1.1K views09:05
2021-07-26 16:52:30
#MOSTimp Some Points :#FROMNCERT
Rheumatoid factor is a type of immunoglobulin IgM.
Anaphylaxis is a generalized and severe form of allergy.
Hashimoto disease is also known as autoimmune thyroiditis.
Thalassemia is an autosome linked recessive disease.
Down's syndrome is the presence of an additional copy of the chromosome number 21 (21st Trisomy)
Turner's syndrome = 45 with XO
#STAY_TUNED UNMUTE_THIS_CHANNEL
589 viewsedited 13:52
2021-07-26 11:15:26
#imp #TRICK FUNCTION OF LARGE INTESTINE #FROMNCERT
TRICK: DEWS
1)D- defecation.
2)E- excretion of bivalent ions
like sulphate,
carbonate, phosphate
(NOTE- kidneys can't
excrete bivalent ions ).
3)W- water and drug absorption
4)S - synthesis of Vit-k & vit-
B12 by the microbes of
large intestine
748 views08:15
2021-07-26 09:42:44
#Mostimp Important Points For NEET #FROMNCERT
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
734 views06:42
2021-07-26 08:11:02
#MOSTimp points related to B2H6 (Diboron) :-
• Total no. Of Banana Bond = 2
• Hybrid state of Boron - SP³
• Electron deficient species
• No. Of 3C - 2e bonds = 2
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• Non planar (Tetrahedral)
• Maximum atoms in same plane = 6
• Replaceable H-atoms = 4 (Terminal H)
699 views05:11
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