CBSE > Class 08 > Science | CBSE Board | Homework Help

Teflon is polytetrafluoroethylene, or PTFE. The molecular structure of Teflon is based on a chain of carbon atoms, the same as all polymers. ... The bond between carbon and fluorine is very strong, and the fluorine atoms shield the vulnerable carbon chain. This unusual structure gives Teflon its unique properties.

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Sri Bhava Pragalyaa 5 years, 3 months ago

Actually Teflon is an thermoplastic. The monomer unit present in Teflon is Tetra Fluro Ethene. It's highly resistance to chemicals and heat. Tolerates high heat and chemicals. Tolerates high heat. An special plastics. It's antisticking. Used as lubricant ( reduces friction). Used for making antisticking pans.

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What will happen if a farmer skip telling the soil before sowing the seed

Posted by Abhay Yadav 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

It's a very important task to plough the soil before sowing seeds. If someone prevents to do so, the seed would lack healthy growth for the process of tilling helps to mix the nutrients well and also helps the seed to be in contact with air. This in turns, provides the water go penetrate through the soil and reach the roots. Thus we can say that sowing should be done after tilling the soil completely.

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What do you mean by magnitude

Posted by Laki Swain 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Shivani Sharma😋🧟🙈 5 years, 3 months ago

The magnitude is a number that characterizes the relative size of an earthquake .Magnitude is based on measurement of the maximum motion recorded by a seismograph.(May this answer help you)thanks.

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What is solar panel

Posted by Saif Malek 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Shivani Sharma😋🧟🙈 5 years, 3 months ago

Solar panel are devices that convert light into electricity .They are called "solar "panels because most of the time ,the most powerful source of light available is the Sun , called Sol by astronomers.Some scientists call them photovoltaics which means ,basically "light - electricity." (May this answer help you)thanks.

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What is seed germination

Posted by Abhay Yadav 5 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Shivani Sharma😋🧟🙈 5 years, 3 months ago

Seed germination may be defined as the fundamental process by which different plant species grow from a single seed into a plant .this process influences both crop yield and quality .A common example of seed germination is the sprouting of a seedling from a seed of an angiosperm or gymnosperm.(may this answer help you) thanks.

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Saif Malek 5 years, 3 months ago

Garena free fire

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What is Agricultur ?

Posted by Abhay Yadav 5 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Akanksha Verma 5 years, 3 months ago

The science that deals with the production of growing crops and rearing animals for food and human use is reffered to as agriculture

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Shivani Sharma😋🧟🙈 5 years, 3 months ago

Agriculture is the cultivation of animals , plants ,and other living things in order to produce food and other products used to sustain human life. In simple word :The process of growing crops on a large scale is called agriculture.(may this answer help you ) thanks.

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Gaurav Seth 5 years, 3 months ago

Agriculture is a primary activity that includes growing crops, vegetables, fruits, flowers and rearing livestock. Agriculture is a primary activity, as it is connected with the extraction and production of natural resources.

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I have a doubt

Posted by Samyuktha Prabhu 5 years, 3 months ago

CBSE > Class 08 > Science

4 answers

Muskan Taparwal 5 years, 3 months ago

What is doubt tell?

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Sri Bhava Pragalyaa 5 years, 3 months ago

What the question is?

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Shivani Sharma😋🧟🙈 5 years, 3 months ago

But what is your question?

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Samyuktha Prabhu 5 years, 3 months ago

Can u please answer it

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Give any two uses of coal

Posted by Harlongbi Killing 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 5 years, 3 months ago

Uses of coal

It is used as a fuel in homes and industry.
It is used as a fuel at thermal power plants for generating electricity.
It is used to make coal gas which is an important industrial fuel.
It is used to make coke.
It is used as a source of organic chemicals.

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ANSWER

Which virus causes tobacco mosaic disease ?

Posted by Seema Agrawal 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Sri Bhava Pragalyaa 5 years, 3 months ago

Tabbaco Mosaic Virus (TMV) is a positive sense single standard RNA Virus species in genus Tobamovirus that infects a wide range of plants, especially Tabbaco & other members of solanaceae family ( A family of flowering plants. Also called as nightshades). May this helpful.

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What is matalloid

Posted by G.Sri Charan 5 years, 3 months ago

CBSE > Class 08 > Science

4 answers

G.Sri Charan 5 years, 2 months ago

Thanks for giving answer to me

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Shivani Sharma😋🧟🙈 5 years, 3 months ago

A metalloid is an element that has properties that are intermediate between those of metals and nonmetals.Metalloids can also be called semimetals.On the periodic table ,the elements colored yellow,which generally border the stair - step line,are considered to be metalloids. (May this answer help you ) thanks.

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Sri Bhava Pragalyaa 5 years, 3 months ago

Metalloids include the properties of both metal and non metals.

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Yogita Ingle 5 years, 3 months ago

Metalloids are a very small group of elements found in the periodic table of elements along the zig-zag line that distinguishes metals from non-metals and is drawn from between boron and aluminum to the border between polonium and astatine.
Following are the elements that are considered to be metalloids:

Boron (B)
Silicon (Si)
Germanium (Ge)
Arsenic (As)
Antimony (Sb)
Tellurium (Te)
Polonium (Po)

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ANSWER

What is meant by 3A group of elements in periodic table? Guys plz anyone answer..

Posted by Sri Bhava Pragalyaa 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

Group 3A (or IIIA) of the periodic table includes the metalloid boron (B), as well as the metals aluminum (Al), gallium (Ga), indium (In), and thallium (Tl). Boron forms mostly covalent bonds, while the other elements in Group 3A form mostly ionic bonds.

The Group 3A metals have three valence electrons in their highest-energy orbitals (<i>ns</i>²<i>p</i>¹). They have higher ionization energies than the Group 1A and 2A elements, and are ionized to form a 3+ charges.

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What is aldehyde

Posted by Trayaksha Tripathi 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

In aldehydes, the carbonyl group has one hydrogen atom attached to it together with either a 2nd hydrogen atom or a hydrogen group which may be an alkyl group or one containing a benzene ring.

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A best timetable for study

Posted by Shubham Tiwari 5 years, 3 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Penicillin is antibiotic for which disease

Posted by Aditya Jangid 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Sri Bhava Pragalyaa 5 years, 3 months ago

Used to treat certain infection caused by bacteria such as pneumonia and other respiratory tract infections, scarlet fever, ear, skin, gum, mouth, throat infection.

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which these is not a viral disease common cold, transpiration,showing, none of these

Posted by Abhineet Goyal 5 years, 3 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

The right meal for adolescents consists of -

Posted by Sushil Sharma Attri 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 5 years, 3 months ago

The right meal for adolescents consists of (ii) chapati, dal, vegetables.

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ANSWER

Please give me answer please its a request

Posted by Shivani Sharma😋🧟🙈 5 years, 3 months ago

CBSE > Class 08 > Science

4 answers

Muskan Taparwal 5 years, 3 months ago

What is your questions

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Shivani Sharma😋🧟🙈 5 years, 3 months ago

Question is related to propane and butane gases

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Shivani Sharma😋🧟🙈 5 years, 3 months ago

Sabse niche dikho please I ask a question but uska answer nahi aaaya kya tum bta sakti ho please

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Sri Bhava Pragalyaa 5 years, 3 months ago

What is your question?

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What is the unit of light

Posted by Shudha Prajapati 5 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Shudha Prajapati 5 years, 3 months ago

I am ask about physics I want correct answer - understand ok

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Yogita Ingle 5 years, 3 months ago

When we talk about the unit of light it does not make much sense practically. It’s mainly because light is not a physical quantity and as a result, it cannot be measured. However, light does have various physical properties like wavelength, intensity, speed, etc and these all can be measured

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Definition of fauna

Posted by Jagatpati Singh 5 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Shivani Sharma😋🧟🙈 5 years, 3 months ago

Fauna is all of the animal life dongle in a particular region or time. Fauna is a term which refers to all of the animal life within a specified region ,time period ,or both.(may this answer help you)thanks.

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Gaurav Seth 5 years, 3 months ago

All the animals that live wild in a particular area are called as Fauna

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Definition of migratory birds

Posted by Jagatpati Singh 5 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Sri Bhava Pragalyaa 5 years, 3 months ago

Birds that migrates from a place to another place bcoz of certain conditions like change in temperature / climate, reproduction, an some more reasons. ( Even humans migrates from place to place in certain situations)....

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Shivani Sharma😋🧟🙈 5 years, 3 months ago

Avian migration is a natural process ,whereby different birds fly over distances of hundreds or thousands of kilometres in order to find the best ecological conditions and habitats for feeding ,breeding and raising their young.when the conditions at breeding sites become unfavourable due to low temperatures ,migratory birds fly to regions where conditions are better. Example=hazel hen ,black woodpecker. (May this answer help you ) thanks.

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What is a kinetic force?

Posted by Aditya Jangid 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 3 months ago

Kinetic friction is defined as a force that acts between moving surfaces. A body moving on the surface experiences a force in the opposite direction of its movement. The magnitude of the force will depend on the coefficient of kinetic friction between the two material. Kinetic energy is a scalar quantity; it does not have a direction. Unlike velocity, acceleration, force, and momentum, the kinetic energy of an object is completely described by magnitude alone. Like work and potential energy, the standard metric unit of measurement for kinetic energy is the Joule.

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How many types of endoplasmic reticulum are there

Posted by Jivitesh Sharma 5 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Nishtha Sharma 5 years, 2 months ago

Therea are two types of endoplasmic reticulam , namely RER(rough endoplasmic reticulam) and SER(smooth endoplasmic reticulam)

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Jivitesh Sharma 5 years, 3 months ago

Please answer

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What is meant by endoplasmic reticulum in an animal cell ?

Posted by Jivitesh Sharma 5 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Jivitesh Sharma 5 years, 3 months ago

From which class you are

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Meghna Thapar 5 years, 3 months ago

An organelle consisting of a network of membranes within the cytoplasm of eukaryotic cells that is important in protein synthesis and folding and is involved in the transport of cellular materials. The endoplasmic reticulum can be continuous in places with the membrane of the cell nucleus. The endoplasmic reticulum (ER) is a type of organelle found in eukaryotic cells that forms an interconnected network of flattened, membrane-enclosed sacs or tube-like structures known as cisternae. Hence it forms exoskeleton.

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What is meant by peritalsis ?

Posted by Jivitesh Sharma 5 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Shivani Sharma😋🧟🙈 5 years, 3 months ago

The repeated movements made by the muscle walls in the digestive tract tightening and then relaxing that push food and waste through the body It is called peristalsis . (May this help you)thanks.

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Leprosy is caused by which microbe

Posted by Namrata Choithani 5 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Aditya Jangid 5 years, 3 months ago

Mycobacterium leprae

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Namrata Choithani 5 years, 3 months ago

Mycobacterium leprae

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What are viruses and how do they differ from bactera? Tell in respect to Covid-19

Posted by Aditya Jangid 5 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Namrata Choithani 5 years, 3 months ago

Iske answer mat do mam ne khud kar ne ke liye diya h

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Namrata Choithani 5 years, 3 months ago

Ye hamara holiday homework h

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Meghna Thapar 5 years, 3 months ago

Viruses are tinier than bacteria. In fact, the largest virus is smaller than the smallest bacterium. All viruses have is a protein coat and a core of genetic material, either RNA or DNA. Unlike bacteria, viruses can't survive without a host.

Bacteria are simple, single celled organisms, called prokaryotes, which means their DNA is contained within a certain area of the cell called the nucleoid, but not enclosed. Bacteria are one of the oldest living things on earth, having been in existence for at least 3.5 billion years. A microscope is needed to see them.

Bacteria and viruses differ in their structure and their response to medications.
Bacteria are single-celled, living organisms. They have a cell wall and all the components necessary to survive and reproduce, although some may derive energy from other sources.
Viruses are not considered to be “living” because they require a host cell to survive long-term, for energy, and to reproduce. Viruses consist of only one piece of genetic material and a protein shell called a capsid. They survive and reproduce by “hijacking” a host cell, and using its ribosomes to make new viral proteins.
Less than 1% of bacteria cause disease. Most are beneficial for our good health and the health of Earth’s ecosystems. Most viruses cause disease.
Antibiotics may be used to treat some bacterial infections, but they do not work against viruses. Some severe bacterial infections may be prevented by vaccination.
Vaccination is the primary way to prevent viral infections; however, antivirals have been engineered that can treat some viral infections, such as Hepatitis C or HIV. Antivirals are not effective against bacteria.

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What is meant by rhibosome and lysosome ?

Posted by Jivitesh Sharma 5 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Namrata Choithani 5 years, 3 months ago

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Namrata Choithani 5 years, 3 months ago

The rhizobium nitrogen fixing bacteria present in tools fixes atmospheric nitrogen into nitrate

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Aditya Jangid 5 years, 3 months ago

What is wrong in this can you tell me

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Jivitesh Sharma 5 years, 3 months ago

No , your answer is wrong . I appreciate you for your attempt . Keep trying . Let other answer

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Aditya Jangid 5 years, 3 months ago

Rhizobium nitrogen fixing bacteria that convert the atmospheric nitrogen into liquid form.

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ANSWER

List some common humans diseases caused by microorganism, their mode of their causative microorganisms, their mode of transmission and the preventive measures taken.

Posted by Prince Kumar 5 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Sri Bhava Pragalyaa 5 years, 3 months ago

It is in our ncert Science book ln-2. Please refer with it. We have details about ur que there. Kindly check.

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Namrata Choithani 5 years, 3 months ago

Cholera caused by vibro cholerae by rotten food and water .typhoid by salmonella typhi by rotten food and water

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Name the component by which plants make their food

Posted by Ishu Kumar 5 years, 3 months ago

CBSE > Class 08 > Science

4 answers

Shivani Sharma😋🧟🙈 5 years, 3 months ago

The components are sunlight ,chlorophyll,air ,and water .the process in which plant make their own food by the help of leaves it is called photosynthesis .(may this answer help you)thanks.

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Jivitesh Sharma 5 years, 3 months ago

Components are sunlight , chlorophyll ,water , minerals , air

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Sri Bhava Pragalyaa 5 years, 3 months ago

Chllorophyll. Mediums for food production in plants through Chllorophyll are water, minerals, sunlight. This process is named as photosynthesis.

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Ishu Kumar 5 years, 3 months ago

Carbon dioxide oxygen minerals

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