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Yogita Ingle 6 years, 1 month ago
Efflorescence is the loss of water (or a solvent) of crystallization from a hydrated or solvated salt to the atmosphere on exposure to air.
Efflorescence means "to flower out" in French is the migration of a salt to the surface of a porous material, where it forms a coating. The essential process comprises the dissolving of an internally held salt in water, or occasionally in another solvent. The water, with the salt now held in solution, migrates to the surface, then evaporates, leaving a coating of the salt.
Example is Gypsum (CaSO4.2H2O) is a hydrate solid that, in a sufficiently dry environment, will give up its water to the gas phase and forms anhydrite (CaSO4).
Posted by Nisha Singh 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
In amoeba, splitting of the cell into two during cell divison can take place in any plane. Leishmania has a whip like structure at one end of the cell, hence binary fission occurs in a definite orientation in relation to this structure.
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| Displacement reaction | Double displacement reaction |
| In a displacement reaction, a more reactive element replaces a less reactive element from a compound. | In a double displacement reaction, two atoms or a group of atoms switch places form new compounds. |
| In a displacement reaction, one displacement takes place.
A + BX → AX + B |
In a double displacement reaction, two displacements take place to complete the reaction.
AB + CD → AC + BD |
| Change in colour takes place with no precipitate forms. | Precipitate is formed. |
| Metals react with the salt solution of another metal. | Salt solutions of two different metals react with each other. |
| Examples:
2KI + Cl2 → 2KCl + I2 is a displacement reaction. CuSO4 + Zn → ZnSO4 + Cu is also a displacement reaction. |
Examples:
Na2SO4 + BaCl2 → BaSO4 + 2NaCl is a double displacement reaction. 2KBr + BaCl2 → 2KCl + BaBr2 is also a double displacement reaction. |
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Posted by Class 12 6 years, 1 month ago
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♛ ❝Ѕυнαɴα❞ ♛ 6 years, 1 month ago
Nath →Na
Ka →Ca
Mali→ Mg
Aalu →Al
Zra→ Zn
Fike→Fe
Pkata →Pb
Hai→ H
Natasha Bhadoriya 6 years, 1 month ago
♛ ❝Ѕυнαɴα❞ ♛ 6 years, 1 month ago
K Na Ca Mg Al Zn Fe Pb H
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Yogita Ingle 6 years, 1 month ago
Molecular phylogeny is how the molecular structures are used for gaining data or information about the evolutionary relationship of an organism.
One of the most common approaches, in this case, is how homologous genetic sequences are compared by using a sequence alignment process.
It helps to identify a similarity which will cover T-Coffee and Clustal W. Mitochondrial DNA data is used by molecular phylogeny for building a “relationship tree” which shows the entire evolution of different organisms.
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The refracted ray, incident ray and normal all lie in the same plane.
The ratio of sine of angle of incidence and angle of refraction is constant.
Absolute refractive index is defined as the ratio of the velocity of light in vaccuum to the velocity of light in medium.
Expression to relate speed of light in vacuum=
n=c/v
Posted by Mandeep Kaur 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Metal compound A is CaCO3
Gas evolved is CO2
Balanced equation:
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)
Posted by Natasha Bhadoriya 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Molecular phylogeny is how the molecular structures are used for gaining data or information about the evolutionary relationship of an organism.
One of the most common approaches, in this case, is how homologous genetic sequences are compared by using a sequence alignment process.
It helps to identify a similarity which will cover T-Coffee and Clustal W. Mitochondrial DNA data is used by molecular phylogeny for building a “relationship tree” which shows the entire evolution of different organisms.
Posted by Harsh Bansal 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Excretion
- The biological process of removal of harmful nitrogenous metabolic waste from the body is called excretion.
- Unicellular organisms excrete by diffusion and multicellular organisms use specialized organ to perform same function.
Excretion in human beings
- A pair of kidneys, a pair of ureters, a urinary bladder and a urethra constitutes the human excretory system.
- Kidneys are present on either side of the backbone in the abdomen.
- Kidneys produce urine and urine from kidney passes through the ureters into the urinary bladder and remains stored their until it is released through the urethra.
- Urine is produced to filter out waste products from the blood.
- Nephrons are basic structural and functional unit of kidney.
- Cluster of thin walled blood capillaries called glomerulus in the nephron filtrate the urine and each cluster is associated with cup shaped end of a tube called Bowman’s capsule.
- Substances like glucose, amino acids, salts and a major amount of water is selectively reabsorbed from the initial filtrate as the urine flows along the tube.
- Reabsorption depends on the amount of excess water in the body and dissolved waste to be excreted.
- The urine from kidney enters the long tube called ureter.
- Ureter connects the kidney with the urinary bladder and urine from the kidney is passed to urinary bladder and stored in the bladder.
- When the pressure in the expanded bladder leads to the urge to urinate, the urine is passed out through urethra.
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Simmi Yadav 6 years, 1 month ago
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