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    • Posted by Priya Graak 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Rajani Naik 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Satyam Chaubey 5 years, 3 months ago

    The intermixing of particles of different states of matter with each other is known as diffusion Examples ; salt inter mix with water .Thos process is known as diffusion

    1Thank You

    Kanav Dumra 5 years, 3 months ago

    Diffusion is the process in which molecules of high concentration move to the direction of lower concentration to make uniform solution. Example :- dye moves to water to make uniform solution.

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    Diffusion is the process wherein the molecules merge as a result of their kinetic energy of random motion. It occurs in liquids and gases because their molecules move randomly. The molecules move from a region of higher concentration to a region of lower concentration, down the concentration gradient, until the concentration equalizes throughout the medium.

    Examples of Diffusion

    • A teabag immersed in a cup of hot water will diffuse into the water and change its colour.
    • A spray of perfume or room freshener will get diffused into the air by which we can sense the odour.
    • Sugar gets dissolved evenly and sweetens the water without having to stir it.

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    • Posted by Sudama Ram 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Pushprajsinh Rathod 5 years, 3 months ago

    Ice floats on water because it is less dense than water.

    0Thank You

    Kanav Dumra 5 years, 3 months ago

    Ice has an open structure. Ice have more intermolecular space between particles than water. Thus, Ice floats on the water ?

    0Thank You

    Gaurav Seth 5 years, 3 months ago

    The mass per unit volume of a substance is called density (density = mass/volume). As the volume of a substance increases, its density decreases.

    Liquids have lower density than that of solids. Water is also a liquid so it should also have less density than that of solid that is ice.

    Though ice is a solid, but it has a cage like structure hence there are large number of empty spaces between its particles. These spaces are larger as compared to the spaces present between the particles of water. Thus for a given mass of water, volume of ice is greater than that of water. Hence, the density of ice is less than that of water. A substance with lower density than water can float on water. Therefore, ice floats on water.

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    • Posted by Rajni Rana 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Shreya .. 5 years, 3 months ago

    There is centripetal acceleration towards centre of the merry go round...which changes its velocity every moment...so answer should be (c)

    0Thank You

    Gaurav Seth 5 years, 3 months ago

    (c) In merry-go-round, the speed is constant but velocity is not constant, because its direction goes on changing i.e., there is acceleration in the motion. So, we can say that the boy is in accelerated motion. 

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 5 years, 3 months ago

    Plastids and MITOCHONDRIA are the two organelles who are known as semi-autonomous organelles because they make some of their own proteins and has their own genetic material. They are present in plant cell as well.

    •Function of Mitochondria= They are the powerhouse of a cell, which provides energy to cell in form of ATP ( Adenosine Tri Phosphate) , its the energy currency of cell.


    •Plastids=They store important chemical substances. It is of three types- Chromoplasts, Leucoplasts, Chloroplasts. Chloroplasts help in photosynthesis. Leucoplasts store starch, oils, protein granules

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Kanav Dumra 5 years, 3 months ago

    I can't draw the structure here but I can name some organelles of plant cell. They are :- 1. Mitochondria , 2. Golgi apparatus , 3. Chloroplasts (plastid) , 4. Lysosomes , 5. Ribosomes , 6. Endoplasmic reticulum (SER, RER) , 7. Vacule.

    1Thank You

    Shreya .. 5 years, 3 months ago

    How to draw here??

    1Thank You

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    • Posted by Anjali Kumari 4 years, 4 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 4 years, 4 months ago

    Endosmosis

    When a cell is kept in a hypertonic solution, the water starts moving into the cell from a region of higher concerntration to the region of lower concerntration is called endosmosis. As a result the cell swells up.

    Activity -

    Buy some raisens
    Put them into a hypertonic solution (eg. water)
    Now wait for some time and observe the raisens.
    The raisens starts swelling up.
    Observation - Through this activity we observe that after putting raisens in hypotonic solution the raisens swells up. Their is also an increase in thier weight.

    Exosmosis

    When a cell is kept in a hypotonic solution, the inner content of cell shrinks as the water moves from the region of higher concerntraion to the region of lower concerntration. This is called exosmosis.

    Activity -

    Buy some raisens
    Put them in a hypotonic solution (eg. A sports drink with a lot of salts in it)
    Wait for a while and observe that the cell starts shrinking
    Observation - Through this actvity we observe that after putting raisens in a hypotonic solution the raisens starts losing water content and gets shrinked.

     

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    • Posted by Narender Arora 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 3 months ago

    Zero relative velocity means the two objects are either stationary (both), or they are separated by the same displacement all the time. That also means that they both have the same speed, velocity and acceleration. They move in the same direction. So the acceleration - time graph will be exactly same for both.

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    • Posted by Yug Kumar 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    The main function of bones are:

    1. Serve as storage of minerals.
    2. Provide structural support.
    3. Protect the internal organs of the body.


    Cartilage: It serves as a shock absorber and allows the smooth movement of the bones at joints. They are mainly found in the nose, respiratory tract, and joints Fibrocartilage is found in the knee, and it is tough and inflexible. Elastic cartilage is found in-ear, epiglottis, and larynx. It is the most flexible cartilage.

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    Lysosomes are the organelles which eliminate the old worn out cells.They are small bag-like structures spread in the cytoplasm.They have digestive enzymes filled inside by which they diges the old or worn out organelles of the cell.Lysosomes are also known as suiside bags. Because, during the disturbance in the cellular metabolism the lysosomes may burst and the digestive enzymes digest their on cell

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Chirag Dahiya 5 years, 3 months ago

    Yes

    1Thank You

    ANSWER

    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Smriti Garg 5 years, 3 months ago

    48 hrs

    3Thank You

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Kanav Dumra 5 years, 3 months ago

    No

    1Thank You

    Mishty Panchal 5 years, 3 months ago

    If a man has covid 19 and he is sneaking without applying a mask, then his droplets will spread in the air. So the answer is yes.

    1Thank You

    Satyam Chaubey 5 years, 3 months ago

    No

    1Thank You

    Faiza Tanvir 5 years, 3 months ago

    Yes

    1Thank You

    Ranjan Satpathy 5 years, 3 months ago

    Yes we can get infected by COVID-19 through the air

    1Thank You

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    • Posted by Ekta Ekta 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Mishty Panchal 5 years, 3 months ago

    We should sanitise them

    1Thank You

    Smriti Garg 5 years, 3 months ago

    Sanitise them before use

    1Thank You

    ANSWER

    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yashi ?? 5 years, 3 months ago

    Precautions are as follows-- 1.) We wash the fruits with warm water and soda. 2.) Then we put them in a basket and put them outside so that because of the sun light they absorb the water.

    1Thank You

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shivam Shekhar 5 years, 3 months ago

    Yes we can able yo protect ourselves from the infection of COVID 19 by taking some small precautions like 1-We should always wear masks when we are going out 2-Never wear the same mask again and again 3-Always maintain the social distance 4-If we feel like cough , breathing problems , fever etc. Go hospital and give the blood samples for the test of Corona virus or anything else 5-If we come from red zone we will Quarantine ourself at least for 7 days By following these steps we can able to protect our self from the infection of covid 19

    1Thank You

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Shivam Shekhar 5 years, 3 months ago

    Self Quarantine are to refrain from any contact with other individual for a period of time such as two weeks during the outbreak of contagious disease usually by remaining it once home Om and limiting contact with family members to reduce transmission of a contagious disease during outbreak individuals are typically ask by health officials to self for an following known contact with an infectious person or after returning from a region where case of the disease are widely reported as the coronavirus spreads across the country thousands of people who may have been exposed to the virus through travel abroad or contact with an infected person has been asked to self foreign time for two weeks to help contain the outbreak

    1Thank You

    Shivam Shekhar 5 years, 3 months ago

    in healthcare facilities isolation represent one of several measures that can be taken to implement infection control the prevention of contagious disease from being spread from a patient to other patient health care workers and visitors aur from outsider to a particular patient

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Kanav Dumra 5 years, 3 months ago

    Development of the vaccine takes a lot of time and when there is virus, it takes more time than to make vaccine of other microbes

    1Thank You

    Raj Vishwakarma 5 years, 3 months ago

    Because covi 19 cause due to the virus and we have no antibiotic of viruse even we not hai antibiotic of dengue flu common cold because they arw viruses

    1Thank You

    Mishty Panchal 5 years, 3 months ago

    Development of a vaccine is a long process that can falter at any step. There is also the issue of effectiveness — how the vaccine performs in real-life conditions against efficacy, which is performance in ideal conditions during trials.Once a candidate is identified, its safety and efficacy have to be tested over three phases, as per protocols. A fourth stage involves collection and analysis of post-marketing data.For Covid-19, there are over 100 vaccines being developed across the world now, some from scratch, some from existing molecules developed for other diseases.

    2Thank You

    ANSWER

    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Mishty Panchal 5 years, 3 months ago

    No, antibiotics do not work against viruses, only bacteria. The new coronavirus (COVID19) is a virus and, therefore, antibiotics should not be used as a means of prevention or treatment.

    1Thank You

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    • Posted by Krish Mishra 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Kanav Dumra 5 years, 3 months ago

    Mitochondria is an organelle of the cell which is used in the production of ATP type of energy. And cytoplasm is a fluid like substance in which all organelles of cells float.

    0Thank You

    Shivam Shekhar 5 years, 3 months ago

    An organelle found in large number in most cells in which the biochemical process of respiration and energy production occurs it has a double membrane the inner part being folded in words to form layers

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shivam Shekhar 5 years, 3 months ago

    Covid-19 affects different people in different ways most infected peoples will develop mild to moderate illness and recover without hospitalization most common symptoms are fever dry cough and tiredness less common symptoms are aches and pains , sore throat, diarrhoea , conjunctivitis, headache, loss of taste or smell, Harsh on skin or discoloration of fingers or toes serious symptoms are difficulty in breathing or shortness of breath second chest pain or pressure 3 loss of speech or movement seek immediate medical attention if you have serious symptoms always call before visiting your doctor for health facilities people with mild symptoms who are otherwise healthy should manage their symptoms at home on average it takes 5 to 6days from when someone is infected with the virus for symptoms to show however it can take up to 14 days

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    • Posted by Anjali Kumari 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shivam Shekhar 5 years, 3 months ago

    CO means corona , VI means virus , D disease. Formally this disease was referred tu as 2019 novel coronavirus or 2019- nCoV the covid-19 virus is a new virus linked to the same family of viruses as severe acute respiratory syndrome s a r s and some type of common cold

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    • Posted by Shagufta Zehra 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    To convert m/sec into km/hr, multiply the number by 18 and then divide it by 5.

    Step 1:

    Multiply 110 by 18

    We have 110 * 18 = 1980

    Step 2:

    Divide 1980 by 5

    1980 = 396 km/he

    Final Answer:

    110 m/sec = 396 km/hr

    0Thank You

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    • Posted by Shagufta Zehra 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    To convert m/sec into km/hr, multiply the number by 18 and then divide it by 5.

    Step 1:

    Multiply 120 by 18

    We have 120 * 18 = 2160

    Step 2:

    Divide 2160 by 5

    2160 = 432 km/he

    Final Answer:

    120 m/sec = 432 km/hr

    1Thank You

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    • Posted by Shagufta Zehra 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Ujjal Das 5 years, 3 months ago

    Yeah yeah yeah

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    Sorry 

    final answer= 129.6 km/hr

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    To convert m/sec into km/hr, multiply the number by 18 and then divide it by 5.

    Step 1:

    Multiply 36 by 18

    We have 36 * 18 = 648

    Step 2:

    Divide 648 by 5

    648/5 = 129.6 km/he

    Final Answer:

    20 m/sec = 72 km/hr

    1Thank You

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    • Posted by Shagufta Zehra 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    To convert m/sec into km/hr, multiply the number by 18 and then divide it by 5.

    Step 1:

    Multiply 18 by 18

    We have 18 * 18 = 324

    Step 2:

    Divide 324 by 5

    324/5 = 64.8 km/he

    Final Answer:

    18 m/sec = 64.8 km/hr

    0Thank You

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    • Posted by Aditya Sharma 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 3 months ago

    In sexual reproduction, the *** cells of one parent fuses with the *** cell of the other parent to form a new cell called zygote which develops into a new organism. The production of a new organism from two parents by making use of their *** cells is called sexual reproduction. Fertilization is the first step in sexual reproduction. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization. During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus which results in the formation of a fertilized egg or zygote. It is due to fertilization that the new individual inherits some characteristics from the mother and some from the father.

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    • Posted by Amay Gupta Gupta 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Kanav Dumra 5 years, 3 months ago

    Because virus when in our body they shows sign of living as they use the biochemical mechanism of different cells of our body. So, there can be harm to the cells of our body.

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    It is difficult to make antiviral medicines than making antibiotics because viruses have few biochemical mechanisms of their own. They enter the host cells and use their machinery for their life processes. So, antiviral medicines will work against the host body. Antibiotics block bacterial synthesis pathways without affecting the body because bacteria use its own metabolic pathway machinery so, it will not affect the host body.

    0Thank You

    Aditya Sharma 5 years, 3 months ago

    This is very easy

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    • Posted by Anunay Shreyas 5 years, 3 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 3 months ago

    A homogeneous mixture is a mixture of two or more chemical substances (elements or compounds), where the different components cannot be visually distinguished. The composition of homogeneous mixtures is constant. ... Some mixtures can be separated into their components by physical (mechanical or thermal) means. If some components are magnetic, they can be separated by using electromagnets, that is, a magnetic separation. Centrifugation can also be used to separate out components. Filtering the mixture through various filter layers (or sieves) can also separate out various components.

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