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    • Posted by Om Choubisa 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Aarti Anand 5 years, 7 months ago

    Bryophyta

    0Thank You

    Rohan Rathour 5 years, 7 months ago

    Bryophyta

    0Thank You

    Ashwani Verma 5 years, 7 months ago

    What is macronutrient

    1Thank You

    ANSWER

    • Posted by ? Ishika ?? 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Mili Kaushik 5 years, 7 months ago

    Pisces ,mammalia ,aves and amphia

    0Thank You

    Jyoti Raghuwanshi 5 years, 7 months ago

    Two subphylum of vertebrata are Agnatha and Gnathostomata.

    1Thank You

    ANSWER

    • Posted by Armaan Thakur 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Dev Raut 5 years, 7 months ago

    Wave is a type of disturbance in medium.there are three types of wave 1.longitudinal wave 2.transverse wave 3.surface wave

    2Thank You

    ANSWER

    • Posted by Molly Arora 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Vishal Rajput 5 years, 7 months ago

    9:1

    1Thank You

    The Unknown Indian 5 years, 7 months ago

    V=velocity ,when we is tripled that means v ka cube . K.E= 1/2 m v2 . ratio will be (1/2 m v2)/(1/2 m v2) . so 1/2 and m will be cancel led . [(v3)2] /[(v,3)2]. So. 2 will be cancelled by 2 .we get ratio v3:v,3

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    • Posted by Prashant Jinwal 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Mili Kaushik 5 years, 7 months ago

    Power are the rate of doing work.SI unit watt.

    0Thank You

    Yogita Ingle 5 years, 7 months ago

    Power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines are given in terms of Horsepower (hp), which is approximately equal to 745.7 watts.

    1Thank You

    ANSWER

    • Posted by P P 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 7 months ago

    Crystallisationis a process that separates a pure solid in the form of its crystals from a solution. The crystallisation method is used to purify solids.

    For example, the salt we get from sea water can have many impurities in it. To remove these impurities, the process of crystallisation is used

    1Thank You

    ANSWER

    • Posted by Suresh Bhai 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Vishal Rajput 5 years, 7 months ago

    it will not carry any charge because one electron balances one proton so the atom as a whole will be electrically neutral

    1Thank You

    The Unknown Indian 5 years, 7 months ago

    Yes , it will because he has to complete his octate so he will take 1 electron to complete as it is in first shell K . 2 n2 = 2×1×2 = 2 . so there must be one more electron to complete .So it take it from another atom .so the charge will be -

    0Thank You

    Namra Rajodiya 5 years, 7 months ago

    It will not carry any charge

    0Thank You

    P P 5 years, 7 months ago

    no

    1Thank You

    ANSWER

    • Posted by Rakesh Pal Pal 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Mili Kaushik 5 years, 7 months ago

    Sound

    0Thank You

    .... ...... 5 years, 7 months ago

    We are able to hear with the help of an extremely sensitive device called the ear.It allows us to convert pressure variations in air with audible frequencies into electric signals that travel to the brain via the auditory nerve.

    0Thank You

    Rakesh Pal Pal 5 years, 7 months ago

    How can we hear sound

    1Thank You

    ANSWER

    • Posted by Yunus Saleem 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Mili Kaushik 5 years, 7 months ago

    Pollution and Acid rain,affects monuments,plants etc

    0Thank You

    Prashant Jinwal 5 years, 7 months ago

    a) acid rain they are effect to soil, crop and skin b) asthma and many disease caused by air

    1Thank You

    Yogita Ingle 5 years, 7 months ago

      Two harmful effects of air pollution are
    (a) Results in respiratory problems, such as asthma, bronchitis, etc.
    (b) Acid rain, affects monuments, plants and animals adversely.

    1Thank You

    ANSWER

    • Posted by Vansh Kukreja 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 7 months ago

    When two similar substances or molecules face force of attraction this force is known as cohesion force. Cohesion force is rampant among water molecules. Surface tension, meniscus and capillary action are the effects of cohesion.

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    • Posted by Dj Jd 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 7 months ago

    Heat energy is needed to convert solid into a liquid because heat energy increases the kinetic energy of the particles. As the kinetic energy increases, the movement of the particles increases and eventually the bond or attraction between the particles gets broken and the particles start moving faster. Moving faster cause the state of the matter to change because the particles in solid are rigid but when heat is applied the particles are loosened and start moving freely. So it change into a liquid state. The heat energy that it used to change 1 kg of solid into liquid at atmospheric pressure and at its melting point is called the latent heat of fusion. In other words it is heat that is needed to melt 1kg of solid into liquid.

    1Thank You

    ANSWER

    • Posted by Sajal Jain 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Vansh Kukreja 5 years, 7 months ago

    20 electrons, 20 protons, 20 neutrons ,name calcium

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    ANSWER

    • Posted by Ankita Thapa 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    •Difference between Mass and Weight:
    Mass Weight
    1. The mass of an object is the quantity of matter contained in it.
    2. The SI unit of mass is kilogram.
    3. The mass of an object is constant.
    4. The mass of an object can never be zero.
    1. The weight of an object is the force with which it is attracted towards the centre of the earth.
    2. The SI unit of weight is newton.
    3. The weight of an object is not constant.
    4. The weight of an object can be zero.

    0Thank You

    ANSWER

    • Posted by Pryash Vardhan 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    The Unknown Indian 5 years, 7 months ago

    It will need one more hydrogen atom to make NH4

    0Thank You

    ANSWER

    • Posted by Lalita Verma 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    According to Bohr’s model, electrons occupy certain stable orbits or shells. Each shell has a definite energy. These orbits or shells are represented by the letters K, L, M, N... or the numbers 1, 2, 3, 4... The maximum number of electrons present in the shell is given by the formula (2n2), where n is the orbit number or shell number. The maximum number of electrons in different shells is as follows: i. The first orbit or K shell will have 2 × 12 = 2 electrons. ii. The second shell will have 2 × 22 = 8 electrons. iii. The third shell will have 2 × 32 = 18 electrons. iv. The fourth shell will have 2 × 42 = 32 electrons and so on. The maximum number of electrons which can be accommodated in the outermost orbit is 8. The orbits or shells are filled in a step-wise manner. Electrons are not accommodated in a given shell unless the inner shells are filled.

    1Thank You

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    • Posted by Waleed Habib 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Aarti Anand 5 years, 7 months ago

    50

    0Thank You

    Vansh Kukreja 5 years, 7 months ago

    concentration of solution = mass of solute/volume of solution 50%= mass of solute /100 (50/100)×100= mass of solute

    0Thank You

    ANSWER

    • Posted by Deepak Ray 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 7 months ago

    F1 = G M m / d1²
    F2 = G M m / d2²

    F1 / F2 = d2² / d1²

    100 / 50 = (d2/d1)²

    d2 = √2 d1

    Hence the distance should be  √2 times the previous.

    0Thank You

    ANSWER

    • Posted by Mansi Batla 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Rohan Rathour 5 years, 7 months ago

    A vector quantity is a quantity which contain both direction and magnitude.It can be positive,negative and zero

    0Thank You

    Meghna Thapar 5 years, 7 months ago

    A quantity that has both magnitude and direction is called vector quantity. Velocity and acceleration of a body is a vector quantity. It can be positive, negative or zero.

    0Thank You

    ANSWER

    • Posted by Anil Rajak 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    Tyndall effect can be defined as the scattering of a beam of light by colloidal particles present in a colloidal solution. This effect can be observed when a fine beam of light passes through a small hole in a dark room. This effect occurs due to the scattering of light by particles of dust or smoke present in the air.

    0Thank You

    ANSWER

    • Posted by ? Ishika ?? 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    The Unknown Indian 5 years, 7 months ago

    Av.speed=total distance ÷total time pay attention to the question you can see the car travel 100 km and return back to 100km .so,total distance = 100+100 Total distance will be 200 and total time will be 60+40=100. Then put formula and you will get . 200÷100=2km/h. Or you can change it into m/s

    2Thank You

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    • Posted by Rebel Tiger 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Mansi Batla 5 years, 7 months ago

    Loda

    0Thank You

    D K 5 years, 7 months ago

    Hello sun

    2Thank You

    ANSWER

    • Posted by Megha Thakur 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Udham Singh 5 years, 7 months ago

    VDg-mg

    0Thank You

    Yogita Ingle 5 years, 7 months ago

    Apparent weight of a body in a fluid means its weight when the object is immersed completely or partially in the fluid. If the object floats in a fluid the buoyant force acted on the object is equal to the actual weight of the object. So the apparent weight of a floating block of wood is zero.

    0Thank You

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    • Posted by Naina Choudhary. 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 7 months ago

    POINTS FOR COMPARISON

    PARENCHYMA

    COLLENCHYMA

    SCLERENCHYMA

    Type of cells

    Living plant cells which originate from ground and protoderm meristem.

    Living plant cells which originate from the pro-cambium.

    Dead plant cells which originate from ground meristem and protoderm procambium.

    Location

    Present in every soft part of the plant.

    Found in leaves, stems, and petioles.

    Found in mature parts of the plants or trees.

    Nature of cells

    Unspecialized and living cells.

    Specialized cells and living cells. 

    Specialized, matured and dead cells.

    Cell Shape 

    Generally isodiametric.

    Elongated

    Sclereids, elongated and fibre shape.

    Cell wall

    Thin cell wall present made up of cellulose.
     

    Uneven cell wall made up of pectin and hemicellulose.

    Hard and thick cell wall made up of lignin.

    Intercellular space between the cells

    Present
     

    Less space present

    Absent, so cells are tightly packed.

    Function

    Help in storage of foods, in gaseous exchange, and in photosynthesis.

    Provide mechanical support and elasticity to the plant.

    Provide mechanical support to the plant, help in transportation of water and nutrients to the plants.

    1Thank You

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    • Posted by Kanchan Choudhary 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Naina Choudhary. 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Anurag Anand 5 years, 7 months ago

    Electron-J.J Thompson Proton - E. Goldstein Neutron - James Chadwick

    2Thank You

    ANSWER

    • Posted by Mahak Khandelwal 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    The Unknown Indian 5 years, 7 months ago

    To put them into special group according to similarity b/w them or dissimilarity

    0Thank You

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    • Posted by Murtaza Cyclewala 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    Applications of ultrasound: i. Ultrasound is used in industry for detecting flaws in metal blocks without damaging them. ii. Ultrasound is used in industry to clean ‘hard to reach’ parts of objects such as spiral tubes, odd-shaped machines and electronic components, etc. iii. It is used to investigate the internal organs of the human body such as liver, gall bladder, pancreas, kidneys, etc. iv. Ultrasound scans are used to monitor the development of foetus inside the mother’s uterus. v. It is used to break kidney stones into fine grains which then get flushed out with urine. vi. It is used in ‘sonar’ apparatus to measure the depth of sea and to locate the under-sea objects like hidden ice bergs in the sea.

    0Thank You

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    • Posted by Muskan Kumari 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Elizabeth James 5 years, 7 months ago

    Hiii

    2Thank You

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    • Posted by Neha Raja 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Aayush Gautam 5 years, 7 months ago

    Lichens is a symbiotic relationship between algae and fungus

    1Thank You

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    • Posted by Naina Choudhary. 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Manjunath S Manju 5 years, 7 months ago

    The energy possessed by the body due to its motion is called Kinetic energy. The energy possessed by due to its position is known as potential energy.

    1Thank You

    Aarti Anand 5 years, 7 months ago

    Kinetic energy is the energy possessed by a body by virtue of its motion . Potential energy is the energy possessed by a body by virtue of its position.

    1Thank You

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