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    • Posted by Varun Tyagi 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 4 answers

    Payal Kasana 4 years, 1 month ago

    Organism that are made up of single cell is called unicellular cell Organism that are made up of more than one cell is called multicellular organisms

    0Thank You

    Arohi Chakote 4 years, 1 month ago

    Singled cell orgnisms are unicellular and multi celled organisms are multicellular organisms

    0Thank You

    Nishant Paliwal 4 years, 1 month ago

    Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. ... Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions.

    0Thank You

    Yogita Ingle 4 years, 1 month ago

    <th>
    Unicellular organisms are composed of a single cell Multicellular organisms are composed of more than one cell
    Irregular in shape Has a definite shape
    Simple body organization Complex body organization
    A single cell carries out all necessary life processes Multiple cells perform different functions
    The total cell body is exposed to the environment Only the outer cells are exposed to the environment
    Division of labour is at the organelle level Division of labour is at cellular, tissue, organs and organ system level
    Includes both eukaryotes and prokaryotes Includes only eukaryotes
    A lifespan of a unicellular organism is usually short Multicellular organisms have a comparatively longer lifespan
    Injury to the cell leads to the death of the organism Injury to a cell does not cause the death of the multicellular organism
    Asexual reproduction is predominant, however, sexual reproduction is also seen (conjugation) Reproduction happens sexually as well as asexually

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    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 4 years ago

    When ionic compounds dissolve in water they go through a process called dissociation, splitting into the ions that make them up. However, when you place covalent compounds in water, they typically do not dissolve but form a layer on top of the water. Electrovalent compounds are formed by complete rtransfer of electrons while covalent compounds are formed by sharing of electrons between 2 atoms. Electrovalent compounds are more soluble in polar solvents like water while covalent compounds are more soluble in non polar solvents like methane.

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    • Posted by Siya Ram 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 5 answers

    👌Aditya 👌 👌Kumar👌 4 years, 1 month ago

    Nervous tissue

    0Thank You

    Laxmi Narayan Sahoo 4 years, 1 month ago

    Yes,nerves are present which means nervous tissue is present

    0Thank You

    Dsouza Frewin 4 years, 1 month ago

    Tissues present in our brain is nerve tissue

    1Thank You

    Arohi Chakote 4 years, 1 month ago

    Nervous tissue

    0Thank You

    Yogita Ingle 4 years, 1 month ago

    The brain, spinal cord and nerves are all composed of the nervous tissue.

    0Thank You

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    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years, 1 month ago

    Because elements of group  1 does not have stable electronic configuration and elements of group 18 have stable electronic configuration

    1Thank You

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    • Posted by Ashutosh Jadhav 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 3 answers

    Arohi Chakote 4 years, 1 month ago

    Dispersed phase and dispersing medium

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    Nishant Paliwal 4 years, 1 month ago

    Classifying Colloids Sol is a colloidal suspension with solid particles in a liquid. Emulsion is between two liquids. Foam is formed when many gas particles are trapped in a liquid or solid. Aerosol contains small particles of liquid or solid dispersed in a gas.

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    Yogita Ingle 4 years, 1 month ago

    Colloids can be classified according to different properties of the dispersed phase and medium.

    Firstly, based on the types of particles of the dispersed phase, colloids can be classified as:

    • Multimolecular colloids
    • Macromolecular colloids
    • Associated colloids

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    • Posted by Janvi Tiwari 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years, 1 month ago

    Dry ice is solid carbon dioxide which is generally used in packing frozen items is an example of molecular solid.

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    • Posted by Deepanshu Dash 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 4 answers

    Nishant Paliwal 4 years, 1 month ago

    Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g/mol respectively, 100 g of NaCl contains 39.34 g Na and 60.66 g Cl.

    1Thank You

    Kashish Chauhan 4 years, 1 month ago

    NaCl

    0Thank You

    Sarthak Gupta 4 years, 1 month ago

    Sodium Chloride is an ionic compound with the chemical formula NaCl. Sodium Chloride is also known as salt.

    0Thank You

    Yogita Ingle 4 years, 1 month ago

    Sodium Chloride is an ionic compound with the chemical formula NaCl. Sodium Chloride is also known as salt.

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    • Posted by Hanshika Shina 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 4 years, 1 month ago

    Carl Wilhelm von Nägeli coined the term “meristem.” Meristematic tissue contains undifferentiated cells, which are the building blocks of the specialized plant structures.

    Meristematic tissues contain living cells with varied shapes. They possess a large nucleus devoid of the vacuole. The cells have no intercellular space. The zone where these cells exist is known as meristem.

    Characteristics of meristematic tissues:

    1. They are made up of immature cells.

    2. They have the capability to differentiate into any cell.

    3. They are living and thin walled.

    4. They are diploid in nature and show mitotic division.

    5. The cells of meristematic tissues are rich in cytoplasm.

    6. They do not contain reserve food materials, ER and plastids.

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    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Pramodsingh Rathore 4 years, 1 month ago

    Because neon consist only 10 ectrons which estable its orbit so its valency is 0 But sodium consits 2 electrons in k orbit than 8 in L orbit than 1 in M orbit so it take away the 1 elctron in other metal so its valency is 1

    0Thank You

    Kashish Chauhan 4 years, 1 month ago

    because neon has all 8 electrons in the outermost shell which is balance So neon element doesn't need to share or take any electron from any other one so its valency is zero. whereas sodium has one an electron in outermost shell which is not properly balance by which sodium has to loose 1 electron from the outer most shell that's why the sodium has valency 1..... I hope it will benefit you buddy...

    1Thank You

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    • Posted by Soumya Shrivas 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Sarthak Gupta 4 years, 1 month ago

    (a) Roots of plant → contain leucoplast which are colourless plastids and act as storage of food. (b) Leaves of plant → contain green coloured chlorophyll for photosynthesis (c) Flowers and fruits →  contain multicoloured chromoplast to attract pollinators

    1Thank You

    Gaurav Seth 4 years, 1 month ago

    Answer :

    (a) Roots of plant → contain leucoplast which are colourless plastids and act as storage of food.
    (b) Leaves of plant → contain green coloured chlorophyll for photosynthesis
    (c) Flowers and fruits →  contain multicoloured chromoplast to attract pollinators

    1Thank You

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    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 4 years, 1 month ago

    sodium chloride has strong force of attraction between its molecules are stable

    ammonia has force of attraction between its molecules and are stable
    sodium chloride is called electrovalent compound because it is formed by transfer of electrons between atoms but ammonia is called covalent compound because it is form by sharing of electron theory between atom

    1Thank You

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    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 4 years, 1 month ago

    Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion. If it gains one or more electrons, it now carries a net negative charge, and is thus "anionic.

    1Thank You

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    • Posted by Arun Kumar 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Bhumija Bajpai 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Nishant Paliwal 4 years, 1 month ago

    Meristematic tissue or meristems, as they are also called are tissues that have the ability to enlarge, stretch and differentiate into other types of cells as they mature. The cells of this tissue are generally young and immature, with the power of continuous division. Meristematic cells are all living cells.

    1Thank You

    Kunal Singh 4 years, 1 month ago

    Meristmatic tissues can growth. It have 3 types :- 1.) Apical tissue 2. Lateral tissue 3. Intercallary tissue 1. Apical tissue is responsible for the growth of top of plants and roots. 2. Lateral tissue is responsible for the growth of thickness (Lateral parts of plants) 3. Intercallary tissue is responsible for the growth b/w two nodes. Meristmatic tissue can be permanent tissue when it lost its capability to growth.

    1Thank You

    ANSWER

    • Posted by Ankit Chauhan 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Nishant Paliwal 4 years, 1 month ago

    dispersed medium consists of two media that do not mix. More specifically, it contains discrete elements of one medium which are dispersed in a continuous second medium. The two media can be of very different nature. In particular, they can be a gas, a liquid or a solid.

    0Thank You

    Ash Greninja 4 years, 1 month ago

    Dispersion Medium: The component in which the dispersed phase is suspended is known as the dispersing medium.

    1Thank You

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    • Posted by Sayantika Malobika 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    M D Vishaal Narayanan 4 years, 1 month ago

    Shows tindall effect

    0Thank You

    Gaurav Seth 4 years, 1 month ago

    Colloids

    • A colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions.
    • For Example: - Soap solution, Milk, Ink, Blood and solutions of synthetic detergents.
    • In a true solution, the solute particles are so small that they cannot scatter or reflect light rays falling on them.
    • In a colloidal solution (or colloid), the particles are big enough to scatter light.
      • If a beam of light is put on a colloidal solution kept in a beaker in a dark room, the path of light beam is illuminated and becomes visible when seen from the side.
      • The path of light beam becomes visible because colloidal particles are big enough to scatter light falling on them in all directions.

    5Thank You

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    • Posted by Shine Rai 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Disha Patil 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Mufeedha S 4 years, 1 month ago

    solution is a homogeneous mixture whereas suspension is a heterogeneous mixture

    1Thank You

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    • Posted by Roshan Chand 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Ash Greninja 4 years, 1 month ago

    It is a method of separating the suspended particles of a substance from a liquid in which the mixture is rotated at high speed in a centrifuge. This method is useful in case the suspended particles in a liquid are too small too be retained by filter paper. Principle of Centrifugation: When a mixture is rotated very fast, the denser particles are forced to go to the bottom of the centrifuge and the lighter particles stay at the top. Applications of Centrifugation: Used in dairies to separate cream from milk. Used in washing machines to squeeze out water from wet clothes.

    2Thank You

    Gaurav Seth 4 years, 1 month ago

     Centrifugation.
    Answer: Sometimes the solid particles in a liquid are very small and pass through a filter paper. For such particles the filtration technique cannot be used for separation. Such mixtures are separated by centrifugation. The principle is that the denser particles are forced to the bottom and the lighter particles stay at the top when spun rapidly.

    2Thank You

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    • Posted by Suba Shree 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Nishant Paliwal 4 years, 1 month ago

    dispersed medium consists of two media that do not mix. More specifically, it contains discrete elements of one medium which are dispersed in a continuous second medium. The two media can be of very different nature. In particular, they can be a gas, a liquid or a solid.

    0Thank You

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    • Posted by Komal Tank 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Gaurav Seth 4 years, 1 month ago

    A N S W E R
    A t o m s is electrically neutral as the number of protons is equal to the number of electrons. Therefore the negative and positive charge cancels out.

    1Thank You

    Kritika Saini Girn 4 years, 1 month ago

    Hgll

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    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 4 years, 1 month ago

    On looking on Argon we will see it has a stable configuration [Ne] 3s2 3p6 completely filled p orbital so it doesn't need to lose or gain electrons, it is a noble gas .

    on the other hand if we look at sodium configuration it is [Ne] 3s1 , there is a free electron in the outer shell so it lose it to become more stable so it always doesn't exist in free form , elements are searching for stability

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    • Posted by Sowparnika Ram 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Hisham Ichoo 4 years, 1 month ago

    I eont no

    1Thank You

    Sowparnika Ram 4 years, 1 month ago

    Answer

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    • Posted by Rengavadivelammal .C 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Nishant Paliwal 4 years, 1 month ago

    Meristematic tissue or meristems, as they are also called are tissues that have the ability to enlarge, stretch and differentiate into other types of cells as they mature. The cells of this tissue are generally young and immature, with the power of continuous division. Meristematic cells are all living cells.

    0Thank You

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    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 4 years, 1 month ago

    An element is regarded as pure because it is only composed of a single type of atom.

    e.g. Sodium is only composed of ‘Na’ atoms

    A compound contains two or more different types of atoms bonded together.

    e.g. Water has 'H' and 'O' in a fixed ratio (2:1)

    Sodium is monoatomic, and composed of a single element and is an element found on the periodic table of elements

    Water is triatomic, consist of more than one element making it a compound.

    1Thank You

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    • Posted by Sunita Sapkota 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Shehrebanu .... 4 years, 1 month ago

    An element is regarded as pure because it is only composed of a single type of atom. e.g. Sodium is only composed of ‘Na’ atoms A compound contains two or more different types of atoms bonded together. e.g. Water has 'H' and 'O' in a fixed ratio (2:1) Sodium is monoatomic, and composed of a single element and is an element found on the periodic table of elements Water is triatomic, consist of more than one element making it a compound

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    • Posted by Chandrika A G 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 3 answers

    Nishant Paliwal 4 years, 1 month ago

    Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them.

    0Thank You

    Devashish Kumar 4 years, 1 month ago

    The tendency of a body to oppose any change in its state of rest, or uniform motion is known as inertia Example--(1) When a bus suddenly start passengers fall in backward direction. (2) When a carpet is bitten with stick dust comes out.

    2Thank You

    Dolly Singh 4 years, 1 month ago

    If an object is in rest it tends to remain at rest and if an object is in motion it tends to be in motion .This property of an object is called it's inertia ...Example-- when we kick a football it flies away but when we kick a stone with equal force it hardly moves...

    2Thank You

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    • Posted by Kartavya Singh 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 2 answers

    Yogita Ingle 4 years, 1 month ago

    Sound waves

    Light waves

    1. They are longitudinal waves

    2. They cannot travel through vacuum

    3. Its speed in air is 330 m/s

    1. They are transverse waves

    2. They do not require medium to propagate

    3. Its speed in air or vacuum is 3x108 m/s
    <div> </div>

    1Thank You

    Amit Kumar 4 years, 1 month ago

    Sound waves travel with compression or rear faction but light wave travel perpendicularly

    3Thank You

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    • Posted by Rengavadivelammal .C 4 years, 1 month ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years, 1 month ago

    • It consists of cells which form membranes.
    • This membrane covers the body surface and the glands.
    • The covering or protective tissues in the animal body are epithelial tissues.
    • Epithelium covers most organs and cavities within the body.
    • It also forms a barrier to keep different body systems separate.
    • The skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue.
    • The cells are tightly packed and form a continuous sheet.

    1Thank You

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