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    • Posted by Krish Krish 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    .. ... 6 years, 4 months ago

    Sonar (sound navigation and ranging) it is a device that uses ultrasonic waves to measure distance,direction and speed of underwater objects. The transmitter produces and transmit ultrasonic waves.These waves travel through water and after striking the objects on seabed,get reflected back and are sensed by the detector.The detector converts ultrasonic waves into electrical signals which are interpreted. The time taken for the echo to return to ship is measured by sonar apparatus.The distance of underwater object is then calculated from time taken by echo to return.The time it takes for an echo to return is used to find out how far away something is. 2d=v*t d=distance from ship to the bed of the sea v=speed of sound through seawater t=time interval between transmission and reception of ultrasound signal.

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    • Posted by Sparshika Singh 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Avengers Endgame Koppula 6 years, 4 months ago

    The zygote develops into an embryo

    0Thank You

    Ramakant Sharma 6 years, 4 months ago

    Form of zygote is known as embryo

    1Thank You

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    • Posted by Parul Sharma 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Nishant Sharma 6 years, 4 months ago

    4 chambers

    1Thank You

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    • Posted by Soul Hritik 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Naman Ahden 6 years, 4 months ago

    Acids are corrosive in nature, they turn blue litmus red eg-: hydrochloric acid. Ph value is less than 7 Bases feels slippery to touch, they turn red litmus blue example-: magnesium hydroxide. Ph value is more than 7

    0Thank You

    Pragya Gupta 6 years, 4 months ago

    * Acids are the substrances which are sour in taste. * Base are the substrances which feel slippery. * Acid + base = salt and water

    1Thank You

    Shameem Shammi 6 years, 4 months ago

    Acids are sour in taste It turn litmus paper

    1Thank You

    L.Nagaraj L.Nagaraj 6 years, 4 months ago

    Acids are substance which are sour. Bases are substance which are slippery eg: soap

    1Thank You

    Shivdeep Dharme 6 years, 4 months ago

    Acid are salty and base are sofay

    1Thank You

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    • Posted by Simarpreet Kaur 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Aaradhya Baghla 6 years, 4 months ago

    Arteries carry oxygenated blood and veins carry deoxygenated blood

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    • Posted by Tanisha Singh 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    .. ... 6 years, 4 months ago

    The respiratory system also called respiratory apparatus is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. Through breathing, inhalation and exhalation, the respiratory system facilitates the exchange of gases between the air and the blood and between the blood and the body’s cells. The respiratory system also helps us to smell and create sound.

    1Thank You

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    • Posted by Ananya Nahar 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Any Khan 6 years, 4 months ago

    Yes of course

    3Thank You

    Aaditya Agrawal 6 years, 4 months ago

    Yes capillaries are very thin tubes which carry oxgen to every cell of human body

    2Thank You

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    • Posted by Palak Kinger 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Any Khan 6 years, 4 months ago

    Electric fuse

    1Thank You

    Palak Kinger 6 years, 4 months ago

    A safety device which prevents damage to electrical circuit and fires

    2Thank You

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    • Posted by Gurjass Sandhu 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Gurjass Sandhu 6 years, 4 months ago

    Chapter 6,7,8 complete home work

    2Thank You

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    • Posted by Subhash Chand 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    .. ... 6 years, 4 months ago

    The flow of energy in food chains is unidirectional. The energy which passes to the herbivores does not come back to the autotrophs. The energy that is captured by the autotrophs does not revert back to the Sun. Therefore, in the food chain, the energy moves progressively through various trophic levels. This energy is no longer available to the previous trophic level. Thus, the flow of energy in a food chain is unidirectional. The pesticides enter a food chain and subsequently get into our body by the following way: Pesticides are sprayed on the crop plants to protect them from the attack of pests. These pesticides when washed away into the soil or water bodies get absorbed by the plants. When plants are consumed as food by man or other animals, the pesticides enter the food chain. Since the pesticides are non-biodegradable, these chemicals get accumulated progressively and enter our body.

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    • Posted by Manasa M Manasa M 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 3 answers

    .. ... 6 years, 4 months ago

    Blood carries(transports)oxygen from the lungs to different parts of body. It also carries digested food molecules from the small intestine to different parts of the body.It also transports hormones to the target organs,waste materials from various parts of the body (excretion organs like lungs,skin,kidney etc.) It regulates various function in the body. It helps to fight against disease germs.Blood helps to maintain our body temperature.

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    .. ... 6 years, 4 months ago

    Blood :-55% liqiud (plasma)-------->92%water and 8%dissolved plasma proteins:-Serum albumin,Serum globulin,serum fibrinogen and Lipoproteins------------------------------------------ 45%solid--------->Red blood cells (Erythrocytes),White blood cells(Leueoytes)Blood platelets(Thrombocytes)

    0Thank You

    Pratiksha Chaudhary 6 years, 4 months ago

    Of three types were used first platelets second RBC third BC IV plasma

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    • Posted by Satyam Mane 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    .. ... 6 years, 4 months ago

    1] By doing afforestation ( Plantation down of trees ) 2] By planting crops with deep roots that will draw nutrients from deep in the earth and also bind the soil together. 3] Drain rain water run off properly. 4] By reducing tillage. 5] Allow grass to grow in plenty fields. 6] By avoiding overgrazing. Read more on Brainly.in - https://brainly.in/question/2414457#readmore

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    • Posted by Harish Thiyagarajan 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Prakaash Prakaash 6 years, 4 months ago

    Heat and light

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    • Posted by Alok Ral 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 4 months ago

    The two effects of electric current are; heating effect and magnetic effect.

    1Thank You

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    • Posted by Alok Ral 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Any Khan 6 years, 4 months ago

    The features or characteristics of an organism which enable it to survive in its habitat are called adaptations ...??

    1Thank You

    Home Stay 6 years, 4 months ago

    The action or process of adapting or being adapted

    0Thank You

    Yogita Ingle 6 years, 4 months ago

    Animals and plants; living in such places; develop certain features which help them survive the harsh climate. To develop certain features in order to survive the given climate is called adaptation.

    1Thank You

    Alok Ral 6 years, 4 months ago

    1 ) Heatng effect 2) Magnetic effect

    1Thank You

    Riya Sheemar 6 years, 4 months ago

    A habbitat or area which has suitable conditions for animals to adapt

    1Thank You

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    • Posted by .. ... 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Yogita Ingle 6 years, 4 months ago

    Black holes are one of the most mysterious and powerful forces in the universe. A black hole is where gravity has become so strong that nothing around it can escape, not even light. The mass of a black hole is so compact, or dense, that the force of gravity is too strong for even light to escape.

    Black holes are truly invisible. We can't actually see black holes because they don't reflect light. Scientists know they exist by observing light and objects around black holes. Strange things happen around black holes to do with quantum physics and space time. This makes them a popular subject of science fiction stories even though they are very real.

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    .. ... 6 years, 4 months ago

    Sorry I by mistake change the subject. Actually I want it in hindi

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    • Posted by Akram Ahamad 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Pratiksha Chaudhary 6 years, 4 months ago

    Yahi Mata Bata wali Kumawat Rahe

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    • Posted by Archana Chandrakar 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 4 months ago

    Having black and white skin is a type of adaptation known as camouflaging. It is called counter-shading and makes it harder for both the predators and the prey to see penguins from all sorts of angles. The white chest of penguin protects them in the water by camouflaging them from being seen from below against the lighter sky coming through the waters surface. Their black backs help them blend in with the darker, deeper ocean waters below them, thus protecting them from their predators. They have thick layer of fat because it keeps them warm under such extreme cold conditions.

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    • Posted by Satyam Mane 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 4 months ago

    Soil contains humus, water, clay, sand and gravel.

    The decaying dead matters in soil are called humus. Humus makes the soil fertile and provides nutrients to the plants.

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    • Posted by Aman Vats 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Home Stay 6 years, 4 months ago

    The power of apparently influencing the course of events by using mysterious or supernatural forces

    1Thank You

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    • Posted by Aman Vats 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    .. ... 6 years, 4 months ago

    In physics, chemistry and materials science, percolation (from Latin percōlāre, "to filter" or "trickle through") refers to the movement and filtering of fluids through porous materials.

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    • Posted by Satyark Kumar 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Aman Vats 6 years, 4 months ago

    A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). Concave mirrors reflect light inward to one focal point. They are used to focus light

    0Thank You

    Aman Vats 6 years, 4 months ago

    Along with water, plasma carries salts and enzymes. The primary purpose of plasma is to transport nutrients, hormones, and proteins to the parts of the body that need it. Cells also deposit their waste products into the plasma, and the plasma in turn helps remove this waste from the body.

    0Thank You

    Aman Vats 6 years, 4 months ago

    Plas

    0Thank You

    Sunil Yadav 6 years, 4 months ago

    What is the concave mirror

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    • Posted by Ayushi Chaudhary 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Aman Vats 6 years, 4 months ago

    Soil is useful for crops, because it gives nitrogen and water to crops for there groth.?

    1Thank You

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    • Posted by Hareesha Bs 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Aman Vats 6 years, 4 months ago

    Cells Use Bleach to Battle Bacteria. Scientists at the University of Otago, Christchurch have discovered that bleach is one of the key factors used by white blood cells to control bacterial infections in the body

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    • Posted by Anuja Lanjewar 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Akriti Mishra 6 years, 4 months ago

    The the respiration in held the presence of oxygen is called aerobic respiration

    2Thank You

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    • Posted by Hari Tk 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Aman Vats 6 years, 4 months ago

    Blood will overflow.

    0Thank You

    Anuja Lanjewar 6 years, 4 months ago

    The blood will be clot.

    0Thank You

    Mayank Tiwari 6 years, 4 months ago

    We will dead?????☠️☠️

    0Thank You

    Vaishuu Choudhary 6 years, 4 months ago

    Platelets is used in blood to clotting but if there are no platelets in blood the blood is not clotting and there are loss of blood

    1Thank You

    Sharanyaa Mandal 6 years, 4 months ago

    The blood will not be able to clot .

    1Thank You

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    • Posted by Preeti Rajput 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Sharanyaa Mandal 6 years, 4 months ago

    34cm

    0Thank You

    Yogita Ingle 6 years, 4 months ago

    The relation between radius of curvature and focal length is given by
    R = 2f
    f = 15cm
    R = 2(17) = 34cm

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    • Posted by Dhan Kumari Subba 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Awanish Kumar 6 years, 4 months ago

    Chemical change

    0Thank You

    Vaishuu Choudhary 6 years, 4 months ago

    Because of the carbondioxide and it's a chemical change because bubble are the new substance and chemical change means a change that form a new substance

    0Thank You

    Yogita Ingle 6 years, 4 months ago

    When baking soda is mixed with lemon juice, bubbles formed because of evolution of carbon dioxide gas. This is a chemical change, because in this reaction new substances are formed.

    0Thank You

    Omm Night Hunter 6 years, 4 months ago

    Chemical change

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    • Posted by Mohit Raj 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 6 years, 4 months ago

    Carl Landsteiner (1900) discovered that there are two types of antigens present on the plasma membrane of the RBC. These are antigen A and antigen B. These are also called corpuscle factors. There are also two types of antibodies present in the plasma. These are antibody A (Anti-A) and antibody B (Anti-B). These are also called plasma factors. The blood is classified into four groups on the basis of the presence or absence of these antigens. These groups are A, B, AB and O. This system of classification of blood is called: ‘ABO’ system.

     

    The following table shows the types of blood groups and their antigens and antibodies:


    Along with the A and B antigens or antibodies many people have another factor called the Rh factor. This is an antigen first found in Rhesus monkey (hence, called the Rh factor). People whose red blood cells contain the Rh antigen are said to be Rh positive (Rh+). People who lack it are called Rh negative (Rh-). A person with Rh blood does not have Rh antibody (which destroys Rh antigen) naturally. But, as and when an Rh antigen enters the blood, it develops and destroys the antigen.

     

    If a person with blood group A has Rh antigen, his/her blood is said to be A+ (A positive). Similarly, if a person’s blood group is B and he/she do not have Rh antigen, then his/her blood group is B-(B negative). So, we have eight blood groups:

     

    A+,B+,AB+,O+,A-,B-,AB- and O-

     

    The following table gives a complete list of blood group matching:


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    • Posted by Awanish Kumar 6 years, 4 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Aman Vats 6 years, 4 months ago

    Sub soil

    1Thank You

    Awanish Kumar 6 years, 4 months ago

    All are wrong

    1Thank You

    Dhruva A 6 years, 4 months ago

    C herizon or bedrock layer

    3Thank You

    Madhu Singh Singh Tomar 6 years, 4 months ago

    Occoding to soil profile -c horizon

    3Thank You

    Mr Ansh Yadav 6 years, 4 months ago

    Mantel

    2Thank You

    ANSWER

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