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ANSWER

Cheek cells are

Posted by Er Dhruv Kumar Gupta 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

The cells of the basal mucosa which are composed of squamous epithelial cells are cheek cells.
They are eukaryotic cells which contain a nucleus and other organelles within enclosed in a membrane.

ANSWER

What is antibodies?

Posted by Ajay Kumar Aggarwal 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 4 months ago

An antibody is a protein produced by the body's immune systemin response to the disease carrying microbe entering our body. Antibody fights against the disease causing microbe and protect our body from infectious diseases.

ANSWER

What is phosphorus ?

Posted by Ujala Pandey 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Zainab Shaikh 6 years, 4 months ago

It is a non metal which react with atmospheric nitrogen vigorously. So it is stored in Water.

ANSWER

why should crumbs be broken

Posted by Anita Gusain 6 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Ayesha Khatua 6 years, 4 months ago

If crumbs are present in the soil ,trees cannot grow properly because root cannot strech the root and it disturb the flow of water and nutrients . crumbs can be removed from the soil by tilling the land which broke the crumbs into fine particles of soil.

Ujala Pandey 6 years, 4 months ago

What is Atom

Ujala Pandey 6 years, 4 months ago

What is phosphorus ?

ANSWER

What is nitrogen fixation?

Posted by Soumaditya Das 6 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Ayesha Khatua 6 years, 4 months ago

There are some organisms like Blue Algae and rhizobium which fix nitrogen from the atmosphere and convert it into nitrogenous compound and fix it in the soil that plants can use it directly

Suhani Singh 6 years, 4 months ago

Fixing fixing of nitrogen from atmosphere by microorganism is called nitrogen fixation

ANSWER

What is carbonisation process

Posted by Mahak Khurdia 6 years, 4 months ago

CBSE > Class 08 > Science

6 answers

Parneet Kaur 6 years, 3 months ago

Process of conversion of fossil fuels into coal is called CARBONISATION

Zainab Shaikh 6 years, 4 months ago

The process of conversion of fossil fuels into coal is known as carbonosation.... And it is known as carbonosation because it is the pure form of carbon

Ayesha Khatua 6 years, 4 months ago

About 300 millions years ago the earth had dence forest in low lying wetland areas .Due to natural processes like flood in this forest buried under the soil ,as more soil deposit over them they were compressed ,the temperature also Rose as this and deeper and deeper, under high pressure and high temperature that plants got slowly converted to coal. As coal contains mainly carbon ,the slow process of conversation of dead vegetation into coal is known as carbonisation.so,coal is also a fossil fuel. It Is one of the fuel used to cook food in earlier it was used in railway engine to produce steam to run the engine. It is also used in thermal power plants to produce electricity.

Dharmendra Kushwaha 6 years, 4 months ago

The process of conversion of fossil fuels into coal is called carbonisation.

Jahanvi Gupta 6 years, 4 months ago

Carbonization The carbonization process is very important in the preparation of AC as this process will determine the imprint effect on the final product. This is the reason why it is important to select the carbonization parameters in order to produce the required quality of the final AC. In the carbonization process, there are several parameters that would affect the structure, and one of these is carbonization temperature. Researchers usually carbonized samples in temperature range of 500–900°C. The samples will release greater amounts of volatiles when carbonized at high temperatures and eventually influence the product yield and porosity [36]. On the other hand, it is still depending on the properties of the starting raw material to react with the wide range of carbonization temperatures. Carbonization consists of two main steps: oxidative and nonoxidative pyrolysis

3Thank You

Yogita Ingle 6 years, 4 months ago

Carbonisation is the term for the conversion of an organic substance into carbon or a carbon-containing residue through pyrolysis or destructive distillation. It is often used in organic chemistry with reference to the generation of coal gas and coal tar from raw coal . Fossil fuels in general are the products of the carbonization of vegetable matter.

ANSWER

Who is father of antibiotics?

Posted by Ameeralam Shaikh 6 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Parneet Kaur 6 years, 3 months ago

Selman Waksman

Yogita Ingle 6 years, 4 months ago

Selman Waksman was the Father of Antibiotics.
Antibiotics are antimicrobial drugs obtained from other organisms (such as moulds, fungus and some soil bacteria) to combat harmful microorganisms. However, they are not very useful against certain microbes such as viruses.

ANSWER

Why we need to conserve the wildlife

Posted by Aastha Yadav 6 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Sia ? 6 years, 4 months ago

Conservation preserves the ecological diversity and our life support systems - water, air and soil.
It also preserves the genetic diversity of plants and animals for better growth of species and breeding.
We humans along with all living organisms form a complex web of ecological system in which we are only a part and very much dependent on this system for our own existence.

Aastha Yadav 6 years, 3 months ago

All the component of the environment are interdependent. Any change in one component may affect all the other component . So , we need to conserve biodiversity for our survival and to maintain the natural ecological balance.

Jahanvi Gupta 6 years, 4 months ago

Wildlife is a precious gift of God to this planet. The term ‘wildlife’ not only caters to wild animals but also takes into account all undomesticated lifeforms including birds, insects, plants, fungi and even microscopic organisms. For maintaining a healthy ecological balance on this earth, animals, plants and marine species are as important as humans. Each organism on this earth has a unique place in food chain that helps contribute to the ecosystem in its own special way. But, sadly today, many of the animals and birds are getting endangered. The natural habitats of animals and plants are being destroyed for land development and farming by humans. Poaching and hunting of animals for fur, jewellery, meat and leather are other great factors contributing to wildlife extinction. If soon, no stringent steps are taken to save wildlife, it would not be long when they will find a place only on the list of extinct species. And that would not be all! The extinction of wildlife species will certainly have a fatal impact on human race as well. So, for us as humans, it becomes a great responsibility to save the wildlife, our planet and most importantly, our own selves.

ANSWER

If an individual species gets extinct, how does it influence the biodiversity of the earth

Posted by Hariom Kumar 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Khushi Rani 6 years, 4 months ago

Explain the process of formetion of petroleum

ANSWER

What is opium

Posted by P Singhayush Foujdar 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Rozy Vaiphei 6 years, 4 months ago

An opium is a powerful drug that is made from the seeds of poppy

ANSWER

What is global warming??

Posted by Sagar Gautam 6 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Jigna Mehta 6 years, 4 months ago

The increase in the level of carbon dioxide which increase temperature of earth is known as global warming

Yogita Ingle 6 years, 4 months ago

Global warming is the increase of earth's average surface temperature due to effect of green houses gases such as carbon dioxide, emission from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from earth.

Hariomm Padhi 6 years, 4 months ago

The increase of the earth's temperature due to the increase in the level of carbon dioxide and other greenhouse effects is called global warming

ANSWER

A blacksmith hammers a hot piece of Iron Man making Atul how does the force due to hammering affect the piece of iron

Posted by Suman Chauhan 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Shyni George 6 years, 4 months ago

Metals are malleable i.e. it is the property of metals that they can be beaten into thin sheets. Therefore, when iron is hammered, the shape of the metal changes

ANSWER

Give me any four examples of microorganisms

Posted by Ashvin Desai 6 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Sriya? Ghosh 6 years, 4 months ago

Algae,protozoa,fungi,bacteria are some microorganisms

Small Girl K 6 years, 4 months ago

Bacteria, fungi,algea,protozoa

3Thank You

ANSWER

A blacksmith hammers of hot piece of iron while making a tool how does the force due to having affect the piece of iron

Posted by Suman Chauhan 6 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Sia ? 6 years, 4 months ago

The force brings about a change is the shape of hot iron piece.

Vikash Kumar 6 years, 4 months ago

Algae, protozoa,fungi, bacteria

ANSWER

How many microorganisms are there

Posted by Ashvin Desai 6 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Shyni George 6 years, 4 months ago

These are types. There are innumerable number of microorganisms

Small Girl K 6 years, 4 months ago

5 they are bacteria,funhi,algea,protozoa and remaining one is a harmful microorganism that is virus

ANSWER

What do you mean by nitrogen fixation??

Posted by Sagar Gautam 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Rishi Singh 6 years, 4 months ago

Nitrogen fixation is the process by which atmospheric nitrogen is converted into simpeller substances .

ANSWER

What is nitrogen cycle??

Posted by Sagar Gautam 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

The continuous process by which nitrogen is exchanged between organisms and the environment is called nitrogen cycle. Nitrogen is an essential nutrient, needed to make amino acids and other important organic compounds, but most organisms cannot use free nitrogen, which is abundant as a gas in the atmosphere.

ANSWER

Perform an activity to distinguish between combustible and non combustible

Posted by Rajeswari Ponnapalli 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

The substances which undergo combustion are called combustible substances.

When a magnesium ribbon burns, it combines with oxygen of air to form magnesium oxide, and liberates heat and light. During this process of combustion, magnesium is a combustible substance.

If we hold a piece of charcoal with a pair of tongs and heat it on the flame of a burner, it starts burning to form carbon dioxide. In this process a lot of heat is produced but only a little light is produced.

In both the examples oxygen is necessary for combustion to take place. Air is the supporter of combustion because it contains oxygen.

ANSWER

What is heart?

Posted by Pooja Singh 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Hariomm Padhi 6 years, 4 months ago

A muscular pump like organ which pumps blood throughout our body is called heart

ANSWER

If the speed of a ball moving in air increases will the air resistance increase or decrease?

Posted by Jagyaseni Behera 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

As the velocity increases, the force of air in resistance to the object increases. As newton's 3rd law states, for every action there is an equal and opposite reaction. Therefore, as the force of the object on the air increases, so does the force of the air on the object. When air resistance acts, acceleration during a fall will be less than g because air resistance affects the motion of the falling objects by slowing it down. Air resistance depends on two important factors - the speed of the object and its surface area. Increasing the surface area of an object decreases its speed.

ANSWER

Name one solid lubricants which is used to reduce frictiona.

Posted by Jagyaseni Behera 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Zainab Shaikh 6 years, 4 months ago

Greece, kerosene oil etc

ANSWER

Why do kabbadi players rub soil on their hand?

Posted by Jagyaseni Behera 6 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Mishthi Mehra 6 years, 4 months ago

They rub soil on their hands to increase friction.

Sriya? Ghosh 6 years, 4 months ago

Kabaddi players rub soil in their hands for better grip of their opponents.This increases friction

ANSWER

Who is the father of plastic?????

Posted by Jagyaseni Behera 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Small Girl K 6 years, 4 months ago

Leo hendrik baekeland

ANSWER

When the first plastic made? and name the first plastic.

Posted by Jagyaseni Behera 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Small Girl K 6 years, 4 months ago

The furst plastic made on 1907 based on the synthetic polymer

ANSWER

Who discovered microbe

Posted by Prashant Kunmawat 6 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Small Girl K 6 years, 4 months ago

Robert Hooke in the years between 1665 to 1683

Rajesh Potla 6 years, 4 months ago

Anton von Leeuwen Hoek

ANSWER

Name the smallest cell

Posted by Kalam Singh 6 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Jagyaseni Behera 6 years, 4 months ago

Mycoplasma

Kalam Singh 6 years, 4 months ago

Please name the smallest cell

ANSWER

A place where animals are protected in their natural habitat is called

Posted by Kamal Gusaiwal 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Kamal Gusaiwal 6 years, 4 months ago

(A) Species found only in a particular area is known as (B) migratory birds fly to far away places because of changes

ANSWER

Define forceis it necessary for the two bodies to be in direct contact for a force to exist between them ? Explain with examples

Posted by Aditya Choudhary 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

When we want to open a door, we have to push the door handle with our hand and while closing it we pull the handle of the door. This means to move an object, it has either to be pushed or pulled. A push or pull on an object is called force.

An interaction of one object with another object results in a force between the two objects. At least two objects must interact for a force to come into play. Suppose a man is standing behind a stationary car. Since there is no interaction between the man and the car, no force acts on the car and hence the car does not move. Now, suppose the man begins to push the car, that is, he applies a force on it. The car may begin to move in the direction of the applied force due to interaction between the man and the car. Note that the man has to push the car to make it move.

ANSWER

Explain how streamlined body helps the object to move faster

Posted by Mehak Grewal 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

The objects having streamlined shapes face less friction when moving through a fluid than the objects which do not have streamlined shapes.

The fluid friction can be reduced by giving special shape called streamlined shape to the objects which move through the fluids. Cars are built with streamlined shape to reduce air resistance caused by air. An aeroplane has a streamlined shape to reduce air friction that it encounters when flying at high speed through the sky. The rockets are also built with streamlined shapes so that they encounter the minimum air resistance.