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What is the valency of carbon?
The valency of carbon is 4. The valency of an element measures its ability to combine with other elements. The valency is determined by the number of electrons in the outer shell of each atom of an element.
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What are the methods used by plants to get rid of excretory products
Plants use the following ways to get rid of excretory products: (1) Plants get rid of gaseous wasts products through stomata on leaves and lenticels in stems. (2) Plants get rid or wastes by secreting them in the form of gums and resins. (3) Plants excrete some waste substances into the soil around them. (4) Plants get rid of stored solid and liquid waste by shedding of leaves, peeling of bark and felling of fruits. (5) Plants get rid of excess water by transpiration.
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Describe the structure and functioning of nephrons
Nephrons are the filtration units of kidney. Each kidney has a large no. of nephrons. The process starts with filtration of urine. 
Cup-shaped structure associated with capillaries is called Bowmans capsule. This collects filtered urine. As this urine flows through the tubular part of nephron, reabsorption of glucose, amino acids, salts and water take place. The amount of water and other substances reabsorbed depends upon how in excess they are present in the body.The urine formed enters into a long tube called ureter through the collecting ducts of kidney. Then urine is collected in urinary bladder.
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two circular coils A and B are placed close to each other.If the current in col A is changed will some current be induced in the coil B? give reason
If the current in the coil A is changed then some current will definitely be induced in the coil B. When the current in coil A is changed, the magnetic field associated with it also changes. As a result, the magnetic field around coil B also changes. This change in magnetic field lines around coil B induces an electric current in it. This process is known electromagnetic induction.
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Who invented the first coin , when and why?
Coins were introduced as a method of payment around the 6th or 5th century BCE. The invention of coins is still shrouded in mystery. According to Herdotous, coins were first minted by the Lydians, while Aristotle claims that the first coins were minted by Demodike of Kyrme, the wife of King Midas of Phrygia. Numismatists consider that the first coins were minted on the Greek island of Aegina, either by the local rulers or by king Pheidon of Argos. Aegina, Samos, and Miletus all minted coins for the Egyptians, through the Greek trading post of Naucratis in the Nile Delta. ...
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why can't we sneeze with our eyes open?
The eyes close just before a sneeze due to a reflex action as the eyes and the nose are connected by cranial nerves. The sneeze sends a stimulation that travels to a nerve in the brain and a nerve in the eyelids triggering the eyes to close.
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Tips for attending grammar section in question paper
General Tips:
1. Give importance to the exercises given at the back of every lesson.
2. Revise grammar exercises before the exams & go through repeatedly the learnt grammar items. For your reference, page number is given for all the questions.
3. Workout all the public question papers and PTA model question papers. Write the answers repeatedly. Check the answers & check where the mistake lies.
4. Regarding poem comprehension, prepare as many questions as possible on your own. Be short in answering.
5. Write answers in correct order given in the question paper. Don’t write answers here and there. ...
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What is a biosphere reserve ?
A biosphere reserve is an area of land or water that is protected by law in order to support the conservation of ecosystems, as well as the sustainability of mankind’s impact on the environment. This means that each reserve aims to help scientists and the environmental community figure out how to protect the world’s plant and animal species while dealing with a growing population and its resource needs. These areas were created by the United Nations Educational, Scientific, and Cultural Organization (UNESCO) under a program called Man and the Biosphere (MAB) in 1968. Since its creation, MAB has helped dozens ...
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State of India having lowest population
Sikkim is the state in India having least population (610,577).
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Which planet has more satellites ? Is Jupiter or Saturn
The planet with the most satellites in the Solar System is Jupiter, with a total of 63 confirmed satellites. Eight of Jupiter’s satellites are regular satellites, with four large spherical moons and four smaller moons that orbit closer to Jupiter. Jupiter has an additional 55 tiny irregular satellites. The planet with the second highest number of satellites is Saturn, with 61 satellites.
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Solved Questions
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Why are oceans are blue in colour?
May 9, 2015, 1:59 p.m. Ratings : 5.0 -
Name the principle on which a rocket works.
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ABCD is a square and ABE is an equilateral triangle outside the square. Prove that angle ACE =half of angle ...
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