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Yogita Ingle 5 years, 11 months ago
Soap and detergents help insoluble particles to become soluble in water. It makes the cleaning easy. Oil or fats are insoluble in water. Soap molecules has two parts- the polar head and the long hydrocarbon tail. The insoluble oil/fat molecules become associated inside the micelle formed by soap molecules with polar hydrophilic (water-loving) groups on the outside and encasing a hydrophobic (water-hating) pocket, which shields the oil/fat molecules from the water making it soluble. Once the dirt or fat molecules are dissolved in water, it can be rinsed away easily.
Posted by Prayas Yadav 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Liver secretes bile. Bile passes from the liver into the gall bladder via a bile duct.
Posted by Aadya Singh ? 5 years, 11 months ago
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Posted by Samit Das 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Urine formation is carried out by the excretory system. The nephrons play a major role in this. They carry out urine formation in various steps like glomerular filtration, selective reabsorption and tubular secretion.
1. Each nephron has a glomerulus, the site of blood filtration. The glomerulus is a network of capillaries surrounded by a cuplike structure, the glomerular capsule (or Bowman’s capsule). As blood flows through the glomerulus, blood pressure pushes water and solutes from the capillaries into the capsule through a filtration membrane. This glomerular filtration begins the urine formation process.
2. Inside the glomerulus, blood pressure pushes fluid from capillaries into the glomerular capsule through a specialized layer of cells. This layer, the filtration membrane, allows water and small solutes to pass but blocks blood cells and large proteins. Those components remain in the bloodstream. The filtrate flows from the glomerular capsule further into the nephron.
3. The resulting filtrate contains waste, but also other substances the body needs: essential ions, glucose, amino acids, and smaller proteins. When the filtrate exits the glomerulus, it flows into a duct in the nephron called the renal tubule
4. Waste ions and hydrogen ions pass from the capillaries into the renal tubule. This process is called secretion. The secreted ions combine with the remaining filtrate and become urine. The urine flows out of the nephron tubule into a collecting duct. It passes out of the kidney and down to the bladder.
Urine is a liquid or water waste product that passes through your urinarytract and is expelled from your body through your urethra. It contains 90-95% water.
Chitresh Khandal 5 years, 11 months ago
Posted by Manirul Islam 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The three limitations of Mendeleev’s Classification are:
(i) The position of hydrogen was a big issue, he put hydrogen in the group of alkali metals.
(ii) He did not explain the wrong order of atomic masses of some elements.
(iii) The position of the isotopes of some elements could not be explained by him.
Posted by Nitika Chaudhary 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The process of igniting Aluminium and Ferric oxide is called thermite reaction. This is an exothermic reaction. Iron obtained in this process is in molten state.
Fe₂O₃ (s) + Al (s) →Al₂O₃ + 2 Fe(l) + Heat
Thermite reaction used for the welding of rails (joining metals) called as thermite welding.
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Meghna Thapar 5 years, 10 months ago
The 'Chipko Andolan' (Hug the Trees Movement) originated from an incident in a remote village called 'Reni' in Garhwal in the early 1970's. A logging contractor had been allowed to cut down trees in a forest close to a village. One day, when the men folk of the village were out for work, the contractor's workers came in the forest to cut down the trees. In the absence of the men, the women of the village reached the forest quickly and clasped the tree trunks with their arms, preventing the workers from cutting down the trees. The forest trees were thus saved. The Chipko Movement quickly spread across all the communities and helped in the conservation of forests.
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Meghna Thapar 5 years, 10 months ago
An AC generator can be changed into a DC generator by replacing the slip-ring arrangement with the split-ring (commutator) arrangement.
In an electric generator, mechanical energy is used to rotate a conductor in a magnetic field to produce electricity. An electric generator consists of a rotating rectangular coil ABCD placed between the two poles of a permanent magnet. The two ends of this coil are connected to the two rings R1 and R2. The inner side of these rings are made insulated. The two conducting stationary brushes B1 and B2 are kept pressed separately on the rings R1 and R2, respectively. The two rings R1 and R2 are internally attached to an axle. The axle may be mechanically rotated from outside to rotate the coil inside the magnetic field.
Outer ends of the two brushes are connected to the galvanometer to show the flow of current in the given external circuit. When the axle attached to the two rings is rotated such that the arm AB moves up (and the arm CD moves down) in the magnetic field produced by the permanent magnet. Let us say the coil ABCD is rotated clockwise. By applying Fleming’s right-hand rule, the induced currents are set up in these arms along the directions AB and CD. Thus an induced current flows in the direction ABCD. If there are larger numbers of turns in the coil, the current generated in each turn adds up to give a large current through the coil.
This means that the current in the external circuit flows from B2 to B1. After half a rotation, arm CD starts moving up and AB moving down. As a result, the directions of the induced currents in both the arms change, giving rise to the net induced current in the direction DCBA. The current in the external circuit now flows from B1 to B2. Thus after every half rotation the polarity of the current in the respective arms changes. Such a current, which changes direction after equal intervals of time, is called an alternating current (abbreviated as AC). This device is called an AC generator.
Posted by Rahul Tiwari Rahul Tiwari 5 years, 11 months ago
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Rani Mishra ??? 5 years, 11 months ago
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