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Describe the threat to the beauty of Taj Mahal ?

Posted by ishraque Haider (Jan 16, 2017) (Question ID: 1412)

  • Answers:
  • Acid rain is a major threat to the beauty of the Taj Mahal. When acid rains fall on themonument (that is completely made of marble), they react with marble to form a powderlike substance that is then washed away by the rain. This phenomenon is known as marble cancer. Also, the soot particles emitted from the Mathura oil refinery located near Agra is leading to the yellowing of the marble.

    Answered by Payal Singh (Jan 17, 2017)
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  • Taj Mahal is made up of white marble. Marble is composed of calcium carbonate. Calcium carbonate reacts with acids and thus gets corroded. This is the reason; acid rain is damaging the Taj Mahal. This wonderful monument does not look white but is looking pale and dull. If corrective measures are not taken, the future generations may not be able to see the beauty of the Taj.

    Answered by Naveen Sharma (Jan 17, 2017)
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define water polluntant

Posted by ujwal singh (Jan 12, 2017) (Question ID: 1301)

  • Answers:
  • Water pollution is an appalling problem, powerful enough to lead the world on a path of destruction. Water is an easy solvent, enabling most pollutants to dissolve in it easily and contaminate it. The most basic effect of water pollution is directly suffered by the organisms and vegetation that survive in water, including amphibians. On a human level, several people die each day due to consumption of polluted and infected water.

    Water pollutant:

    1. Industrial waste
    2. Sewage and waste water
    3. Mining activities
    4. Marine dumping
    5. Accidental Oil leakage:
    6. Burning of fossil fuels
    7. Chemical fertilizers and pesticides
    8. Leakage from sewer lines
    9. Radioactive waste
    10. Animal waste
    Answered by Payal Singh (Jan 12, 2017)
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what are the diferent ways in which water gets contaminated

Posted by ujwal singh (Jan 12, 2017) (Question ID: 1300)

  • Answers:
  • Though water pollution may occur from a variety of sources, there are two terms used to describe how the water became polluted.

    When water is polluted from point sources, this is pollution from a discrete location. This discrete location could be a factory, a sewer pipe or a runoff from a single farm. The BP oil spill in 2010 is an example of point source pollution, because the massive amount of oil leaked from a single point of origin.

    Water pollution may also be from non-point source pollution, which is when several points of contamination over a large area contribute to the pollution of a water body. For example, one water body may be contaminated by multiple sources like agricultural runoff, city street runoff, construction sites and residential lawns. The Mississippi River is at great risk for non-point source pollution because it is so large and is exposed to a variety of possible pollution sources.

    Answered by Naveen Sharma (Jan 12, 2017)
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What is fertilization in human?

Posted by RUDRA PRATAP SINGH CHOTU (Jan 10, 2017) (Question ID: 1238)

  • Answers:
  • Human fertilization is the union of a human egg and sperm, usually occurring in the ampulla of the fallopian tube. The result of this union is the production of a zygote cell, or fertilized egg, initiating prenatal development.

    Answered by Manish Gandhi (Jan 10, 2017)
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what is the shape of our galxy the milkey way

 

Posted by anil pandey (Jan 08, 2017) (Question ID: 1193)

  • Answers:
  • The shape of our galaxy milky way is barred spiral galaxy in which the central elliptical buldge of closely packed starts lying in the direction of Sagittarius.

    Answered by shruti dadhwal (Jan 08, 2017)
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how are cells classified

 

Posted by madhumita reddy (Dec 28, 2016) (Question ID: 907)

  • Answers:
  • Mainly there are two types of cells which are Eukaryotic and Prokaryotic. 

    The Prokaryotic cells do not have a well defined nuclear membrane. Eg blue green algae and bacteria. 

    The Eukaryotic cells have a well defined nuclear membrane. Example human beings. 

     

    On the basis of shape we have round cells,  elongated cells and branched cells. 

    For example nerve cell is the longest and branched cell in a human body so that it can transmit the messages rapidly. 

    Answered by Shweta Gulati (Dec 31, 2016)
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  • Cells are classified into two categories,

    1) prokaryotic cells

    2)Eukaryotic cells

     

    Answered by Leena Burman (Dec 29, 2016)
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what is eutrophication?

what is hydrophobic?

Posted by mothiswar balasankar (Dec 23, 2016) (Question ID: 811)

  • Answers:
  • Eutrophication is enrichment of ecosystem with chemical nutrients mostly by compounds of Nitrogen and Phosphorus is called Eutrophication.It results in growth of algae in water and deteriorates the water quality.

    Hydrophobic- hydro+phobic 

    Hydro means water and phobic means hating or repelling

    So it is the property of molecule which is water repelling in nature.They are non polar in nature and do not mix with water.for example oil,greese etc 

    Answered by shruti dadhwal (Dec 24, 2016)
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  1. When you fly in an aeroplane we say that every door or window should be closed as there is very less oxygen but when we fly in a helicopter we are opening the doors. Can you find the reason for it? How do we get oxygen to breath when we fly in a helicopter?
Posted by NAVABHAARATHI ASOKAN (Dec 20, 2016) (Question ID: 789)

  • Answers:
  • Aeroplane flys at much higher altitude than the helicopter. Therefore the decrese in air pressure in case of aeroplne is much more than helicopter at which they fly. Now we all know that inside the aeroplane we need to maintain the atmospheric pressure to keep all our biological systems properly. so an equillibrium of pressure is maintained there. if the doors and windows are opened that equillibrium will be disturbed and hence the situation can be fatal.

    Since Helicopter can rise only upto a certain level where the air density is lower but not fatal for us so no air pressure equillibrium is maintained. Therefore the doors and windows can be open

    Moreover drag caused by the air is much more in case of aeroplane than helicopter because the former runs in much faster speed than latter. This drag also hamper the functioning of the system of an aeroplane. so the windows are closed. Since the drag in case of helicopter is not much so it doesnot affect the working of a helicopter.

    Answered by Amrita Mukherjee (Jan 18, 2017)
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How is embryo different from a foetus?

Posted by Anant Kumar (Dec 19, 2016) (Question ID: 777)

  • Answers:
  • An embryo is multicellular diploid eukaryote in it earliest stage of development.At the end of 8 weeks in humans, the embryonic stage is over and the fetel stage begins.

    Answered by shruti dadhwal (Dec 19, 2016)
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  • Foetus is the last stage of baby's development while embryo is the first stage.

    Foetus is fully developed and clearly identical as a baby while embryo is just the division's start of a baby and not clearly identical.

    Foetus occurs after embryo and embryo before foetus.

    Embryo is the combination of just two cells while foetus is almost a complete baby.

    Answered by Devanshu Agarwal (Dec 19, 2016)
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microorganism

 

Posted by SHEETAL MALL (Dec 16, 2016) (Question ID: 765)

  • Answers:
  • A microorganism is an organism that is so small to be seen by nakrd eye and are visible by an instrument called microscope.They can be unicellular or multicellular organisms.

    Answered by shruti dadhwal (Dec 18, 2016)
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  • A microorganism or microbe is an organism which is too small to be seen by the unaided human eye. They are microscopic.

    The study of microorganisms is called microbiology.

    Microorganisms include bacteria, fungi, archaea or protists and viruses.

    Answered by Naveen Sharma (Dec 17, 2016)
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my question is why light get dispersed in a glass prism

Posted by Sarthak V Vats (Nov 26, 2016) (Question ID: 635)

  • Answers:
  • When a light ray enters into a denser medium from a rarer medium it bends away from the normal at the interface of the two medium because of the decrease in the velocity. Light rays with longer wavelenth bends the least and with sorter wavelength bends the most. Now we all know the white light has seven component light rays of different colours. All of them vary with respective to their wavelength. Red has the longest wavelenth whereas the violet has the shortest. Therefore when a white light enters into the prism all the component light rays bends away from the normal inversely proportional to their wavelength.e.g. red light bends the least and violet bends the most. Therefore we get a spectrum of seven different colours.  

    Answered by Amrita Mukherjee (Dec 08, 2016)
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  • its simple because every colour of light have diffrent velocity and wavelength.So,when a white light enters the prism the light with large wavelength(red) bends the least and colour light with smallest wavelength(violet) bends the the most and similarly it happens for all the colour of light.and we can see all the diffreny colour of white light.

    Answered by anuranjan vatsalya (Nov 26, 2016)
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what is the common name for the formula N2

Posted by Rishabh Narayan (Nov 22, 2016) (Question ID: 620)

  • Answers:
  • The molecule N2 is called nitrogen molecule.

    Answered by shruti dadhwal (Dec 06, 2016)
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  • Common name for the formula N2 is Nitrogen molecule.

    Answered by RAJENDRA SINGH (Nov 22, 2016)
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How is cloning of dolly done

 

Posted by Abhishek Varma Mandapati (Nov 21, 2016) (Question ID: 613)

  • Answers:
  • Dolly sheep was the first mammal clone. It was created by a process called nuclear transfer from a somatic cell (body cell). In this process from the body of a healthy individual some somatic cells are collected. In case of Dolly the nucleus was collected from the mammary gland of a feamale sheep. Then this nucleus is placed inside an unfertilized oocyte whose nucleus ia already removed. After this hybridization completed successfully this hybrid cell is stimulated for cell division (by giving an electric shock) and once it has attain the blastocyst phase it is implanted in the surrogate mother sheep. In case of Dolly she had three mothers. One has given the genetic material (the nucleus), second on has given the oocyte and third one is the surrogate mother.

    Answered by Amrita Mukherjee (Dec 08, 2016)
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asiatic lions and tigers are endangered species. how do we justify this answer?

Posted by Chandini .V.Nair (Nov 12, 2016) (Question ID: 531)

  • Answers:
    • The Asiatic lion is endangered largely because of hunting by humans after firearms became widespread.  Its numbers are slowly recovering, having risen from merely 100 animals to about 200 today, according to Bristol Zoo Gardens.
    • Tigers are endangered because of climate change, loss of habitat and poaching. Most of the reasons tigers are on the endangered species list are tied to human interference. The overall combined population of all five tiger species is between 3,000 and 5,000, according to National Geographic.                                                                             due to population loss and several inhuman activities they are endangered
    • hope its helpful:)
    Answered by Avanthika Sriram (Nov 12, 2016)
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how does a red list differ from red data book?

Posted by Chandini .V.Nair (Nov 12, 2016) (Question ID: 530)

  • Answers:
  • Red List:

    • The IUCN (International union for conservation of nature) Red list is the most authentic study of the global conservation status for the threatened biological species.
    • The IUCN Red List is set upon criteria to evaluate the risk of being extinct of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world.

    Red Data Book:

    • The Red data bool is the state document maintained for documenting the details rare and endengered species of plant animal fungi upto the level of sub species exist within the area of the state or country.
    • This provides information about studies and monitoring programmes on rare and endengered species and their habitat. 
    Answered by Amrita Mukherjee (Dec 08, 2016)
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what is extinct

Posted by Jaiprakash Singh (Nov 06, 2016) (Question ID: 492)

  • Answers:
  • Extinct means the one which does not exist presently but they existed in the past.For example, Diana sores are extinct species.

    Answered by shruti dadhwal (Dec 06, 2016)
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  • anything which existed in a particular environment but now is not found or available.

    Answered by Radha Jittu (Nov 06, 2016)
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what is cultivation

Posted by rohit jatav (Nov 01, 2016) (Question ID: 472)

  • Answers:
  • Cultivation of crops involves several activities undertaken by a farmer over a period of time which are referred to as agricultural pratices. They are sequentially as follows:

    1. Preparation of soil
    2. Sowing
    3. Adding manure and fertilisers
    4. Irrigation
    5. Protecting from weeds
    6. Harvesting
    7. Storage
    Answered by Amrita Mukherjee (Dec 08, 2016)
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  • Cultivation is the process of production of plants giving them proper nutrients, environment, water etc and taking their care .

    Answered by shruti dadhwal (Dec 06, 2016)
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what is the difference between atmospheric  pressure and vaccum?

 

Posted by Pranjal Gupta (Oct 21, 2016) (Question ID: 437)

  • Answers:
  • The atmospheric pressure is the pressure that an area experiences due to the force exerted by the atmosphere.

    Vacuum is ideally an area which is devoid of any matter that means in vacuum the atmospheric pressure is zero. 

    vacuum pressure is measured as the difference between atmospheric pressure and absolute pressure. (Absolute pressuer : actual pressure at given position)

    Answered by Amrita Mukherjee (Dec 08, 2016)
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  • Vaccuum is the region where pressure is zero and even the sound cannot propagate in vaccuum .The atmospheric pressure is the pressure exerted by the air at sea level and it is taken as 1 atm as standard value.

    Answered by shruti dadhwal (Dec 06, 2016)
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  • Vacuum, is a region without any matter, or a region of zero pressure (perfect vacuum). It is practically impossible to create perfect vacuum. So real vacuum should actually be defined as a region <i>almost </i>devoid of matter, or of very low pressure.


    Vaccum is a non-existent word. It is just a spelling mistake of the former. Other common spelling mistakes made in writing vacuum are <i>vacume, vacum, vaacum, vaccuum</i>

    Answered by Pappu Choudhary (Oct 23, 2016)
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  • Absolute pressure : is zero-referenced against a perfect vacuum, so it is equal to gauge pressure plus atmospheric pressure. Gauge pressure : is zero-referenced against ambient air pressure, so it is equal to absolute pressure minusatmospheric pressure. Negative signs are usually omitted.

     

    Answered by Kashish Gupta (Oct 21, 2016)
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why friction is needed ?

Posted by Pranjal Gupta (Oct 20, 2016) (Question ID: 432)

  • Answers:
  • Friction is required for us to move.we cannot move if there is no friction.we cannot move in a frictionles surface. When we move forward , there is a force which opposes it an it is called friction.

    Answered by shruti dadhwal (Dec 06, 2016)
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  • Friction is a necessary evil . It is needed for the motion of any object over the other . 

    Answered by Meghan Wizard (Oct 23, 2016)
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  • Friction is essential for movement of vehicles, locomotion in our body and a number of other actitivies.

    Answered by RAJENDRA SINGH (Oct 21, 2016)
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Q.1 you are provided with two similar bars , one is a bar magnrt and the other is a soft iron bar . how will you distinguish between them without the use of any other magnet or bar? answer related to geographic north south direction.

Posted by vibhukumar01singh@gmail.com kumar (Oct 13, 2016) (Question ID: 378)

  • Answers:
  • When both the rods are suspended using a thread, the bar magnet always setttle in north- south direction as as itself  acts as huge magnet having north pole towards geographical south. the soft iron bar may settle in any direction,

    Answered by RAJENDRA SINGH (Oct 14, 2016)
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WHAT IS THE FUNCTION OF NUCLEOUS IN THE CELL ?

Posted by Manya Gupta (Sep 28, 2016) (Question ID: 315)

  • Answers:
  • The function of nucleus in the cell are :

    1. It carries genes and helps in inheritance of of character from parents to progeny.
    2. It also the metabolic activity of the cells
    3. it is refered as the brain of the cell
    Answered by Amrita Mukherjee (Dec 08, 2016)
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  • The nucleus is a membrane-enclosed organelle found in eukaryotic cells.

    The function of a nucleus is to control all activities of a cell. It controls gene expression and mediate the replication of DNA during the cell cycle.

    Answered by Rashmi Bajpayee (Sep 28, 2016)
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