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    • Posted by Sandhya Saini 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 7 years, 1 month ago

    Cells are the basic unit bounded by the membrane that consists of the fundamental molecules of life of which all living organisms are made up of. Cell Biology encompasses everything about cells from its basic structure to the functions of every cell organelle.

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    • Posted by Sandhya Saini 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 7 years, 1 month ago

    Meaning Pinocytosis is called cell drinking, substance is directly ingested as it is in dissolved form and ready for cellular absorption. Phagocytosis is called cell eating, in which particles are broken down into simpler substance with the help of enzymes for absorption.

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    • Posted by Safia Nadirsha 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Virendra Singh 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Akanksha Kumari 7 years, 1 month ago

    The movement of water from heigher concentration to lower concentration is called osmosis

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    Saurav Kumar 7 years, 1 month ago

    Osmosis is the passage of water from a reason of high water concentration through a selectively permeable membrane to a reason of low concentration

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    • Posted by Sanskriti Tripathi 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Gajraj Singh Rao 7 years, 1 month ago

    In this experiment , fast moving alpha particles were made to fall on a thin gold foil: 1. he selected a gold foil because he wanted as thin a layer as possible. this gold foil was about 1000 atoms thick. 2.alpha particles are doubly charged helium ions. there mass is 4 u. 3. it was expected that alpha particles would be deflected by the sub atomic particles in the gold atoms. since the alpha particles were much heavier than the protons, he did not expect to aee large diflections

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    • Posted by Sandhya Saini 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Nishant Lamba 7 years, 1 month ago

    Role of atmosphere Carbon dioxide and oxygen are being continuously consumed and generated by the organisms Green plants use carbon dioxide during photosynthesis and produce Oxygen and carbohydrates during respiration of organisms Oxygen and carbohydrates are consumed and carbon dioxide and water are formed Thus a balance of carbon dioxide and oxygen is maintained in the biosphere but in recent years man is indiscriminately using fossil fuels in this process is using more Oxygen and producing carbon dioxide this has resulted in increase of carbon dioxide in the atmosphere

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    • Posted by Uma Shankar Patnaik 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 4 answers

    Priya Singh 7 years, 1 month ago

    Ion means positively and negatively charged particles in an atom

    0Thank You

    Itika Singhal 7 years, 1 month ago

    When atoms get charged then they are called ions.

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    Anshika Kholiya 7 years, 1 month ago

    The positively and negatively charged particles is known as ion

    1Thank You

    Vk Pk 7 years, 1 month ago

    The charged particle is called ion

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    • Posted by Manav Soni 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Anshika Kholiya 7 years, 1 month ago

    Because buyount force act on it and its density is also less than water

    1Thank You

    Sandhya Saini 7 years, 1 month ago

    Because the density of plastic is less than the density of water .So, it came upto the surface of water

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    • Posted by Vaibhav M 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Piyush Sureka 7 years, 1 month ago

    Mole can be defined as a unit which represents 6.023 x10 to the power 23 particles of same matter. A mole (symbol mol) is defined as the amount of substance that contains as many atoms, molecules, ions, electrons or any other elementary entities as there are carbon atoms in exactly 12 gm of .

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    • Posted by Samarth Saurav 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 7 years, 1 month ago

    Liquid drops are spherical in shape because liquids have the tendency to have minimum surface area due to surface tension and out of all possible shapes, sphere has minimum surface area.

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    • Posted by Neha Panwar 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Anshika Kholiya 7 years, 1 month ago

    Triatomic Ozone O^3 Polyatomic Phosphate P^3 Hydroxide OH

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    • Posted by Lily Roy 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Pradeep Sangannanavar 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Tejaswini Chhetri 7 years, 1 month ago

    It's because of its wave length... But not sure. Just confirm it ...guy

    1Thank You

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    • Posted by Gautam Dave 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Sandhya Saini 7 years, 1 month ago

    Those waves in which the particles of medium vibrate back and forth ro the the direction of wave called longitudnal wave and those waves in which the particles of medium vibrate perpendicularly to the direction of wave called transverse waves

    1Thank You

    Neha.G Neha 7 years, 1 month ago

    Transverse waves means compression and rarefaction. Longitudinal waves means crest and trough

    2Thank You

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    • Posted by Titu Yadav 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Prithvi S 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Sandhya Saini 7 years, 1 month ago

    The first letter or first and second letter of english or latin name of elements

    0Thank You

    Tejaswini Chhetri 7 years, 1 month ago

    Their first 2 letters ,first one letter ...or any two letters being found in its chemical name ..formula or first letter of its Latin name or so on

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    • Posted by Pranab Bhardwaj 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 4 answers

    Sandhya Saini 7 years, 1 month ago

    By using formula 2n square where n belongs to number of shell

    0Thank You

    Mallappa Mallappa 7 years, 1 month ago

    K=2 ,L=8,M=16,N=32 now electronic configuration = 2,8,16 ,32

    0Thank You

    Palak ?? 7 years, 1 month ago

    It depends on the atomic no. Of the element....u have to just see the atomic no.,calculate the no. Of electrons by 2nsquare rule....and just arrange the electrons in duplet and octact in all shells until the no. Of electrons is equal to atomic no.

    1Thank You

    Hemu Jain 7 years, 1 month ago

    It is write by the formula 2n² given by bohr and bury . they are K shell = 2, l

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    • Posted by King Azaan 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 6 years, 1 month ago

    Difference between prokaryotic cell and eukaryotic cell:

    Prokaryotic Cell

    Eukaryotic Cell

    i. Cell size is generally small.

    ii. Only a single chromosome is present

    iii. Nucleolus is absent

    iv. Cell division by fission or budding.

    i. Cell is generally large.

    ii. More than one chromosome is present.

     

    iii. Nucleolus is present

    iv. Cell division mitotic or meiotic.

     

     

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    • Posted by Ashir Uddin 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Ziyesha Sourav 7 years, 1 month ago

    The movement of the bob from the mean position to an extreme position and to the other xtreme position and back to its mean position is called an oscillation

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    • Posted by Sudhish Singh 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Beenu Verma 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    ☄️Josna ☄️ 7 years, 1 month ago

    AIDs is a syndrome that is caused by HIV virus.This virus attack to the WBCs of the person and makes the person prone to diseases

    3Thank You

    Arva Jain 7 years, 1 month ago

    AIDS is a virus which can transfer one person to another by sexual contact and it is weak our immune system

    3Thank You

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    • Posted by Sandhya Saini 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Akanksha Kumari? 7 years, 1 month ago

    By using carbon disulphide as solvent. We know that sulphur dissolves in CS2 but carbon will not. Now filter the solution to get carbon as residue.

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    • Posted by Sandhya Saini 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Palak ?? 7 years, 1 month ago

    Tere may be thousands of elements present in this world but till now only 118 elements are known to man kind.....

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    • Posted by Simran Das 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Akanksha Kumari? 7 years, 1 month ago

    We find suberin in cork cells . It makes the cells impermeable to water and gases and it thickens the cell wall.

    3Thank You

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    • Posted by Shivam Kumar 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Pranjali Sinha 7 years, 1 month ago

    Chromatography-it is a technique of separating two or more dissolved solids which are present in a solution in very small quantities.substances are dissolved in same solvent but their solubility may be different. Black or blue ink can be separated by chromatography

    1Thank You

    Pranjali Sinha 7 years, 1 month ago

    Centrifugation-it is a method for separarting the suspended particles of a substance from a liquid in which the mixture is rotated at high speed. Cream is separated from milk by centrifugation.

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    • Posted by Raj Raj 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 6 years, 1 month ago

    Rutherford’s Scattering Experiment:

     

    Rutherford selected a gold foil as he wanted a very thin layer. The gold foil used by Rutherford was 0.004 millimetres  in thickness.  That is, the foil  was about 1000 atoms thick. In his experiment, fast moving α-particles (alpha particles) were made to fall on a thin gold foil. The α-particles are helium ions with a+2 charge. Their atomic mass is  4  u.  Hence,  a  high  velocity beam of α-particles has a lot of energy.

    These  particles  were  studied  by  means  of  flashes  of  light  they  produced  on  striking  a zinc  sulphide screen. The α-particles are much heavier than the sub-atomic particles present in gold atoms.

     

    Hence, he expected the α-particles  to  pass  through  the  gold  foil  with  little  deflection  and  strike  the fluorescent screen. But the observations he made were quite unexpected.

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    • Posted by Sandhya Saini 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Akanksha Kumari? 7 years, 1 month ago

    By using alcohol as suitable solvent because sugar is soluble in alcohol but salt is not soluble in it. Now filter the salt with filter paper.

    2Thank You

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    • Posted by Sasangka Saikia 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Sandhya Saini 7 years, 1 month ago

    Plz chek your questionwhat do u want to say

    0Thank You

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    • Posted by Amit Maheshwari 7 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Meghna Thapar 6 years, 1 month ago

    Fish culture is sometimes done in combination with a rice crop, so that fish are grown in the water in the paddy field. More intensive fish farming can be done in composite fish culture systems. In such a system, a combination of five or six fish species is used in a single fishpond. These species are selected so that they do not compete for food among them having different types of food habits.

    0Thank You

    Meghna Thapar 6 years, 1 month ago

    Fish culture is sometimes done in combination with a rice crop, so that fish are grown in the water in the paddy field. More intensive fish farming can be done in composite fish culture systems. In such a system, a combination of five or six fish species is used in a single fishpond. These species are selected so that they do not compete for food among them having different types of food habits. Composite fish culture is advantageous and economical. It yields about 8-9 times more production than monoculture. All the species of fish live in distinct zone inside the pond and have distinct feeding habits.

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    • Posted by Rida Fatima Ansari 4 years, 9 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Sia ? 4 years, 9 months ago

    An element is a material that consists of a single type of atom. Each atom type contains the same number of protons. Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.

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