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

There is an organisation IUCN that maintain the red book data . In that book they write the names of the animals which are in the diminishing level of extintion .

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Rahul Phani 7 years, 4 months ago

The book in which all endangered animals are written.Many kinds of red data books are written they are= species ed data book eg.birds red data book, a states red data book eg.kerala red data book,a country red data book eg.India red data book

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Sreemayi Ronanki 7 years, 4 months ago

The book in which the endangered animals are recorded

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Mehak Pardhan 5 years, 9 months ago

A red data book contain all endangered animals and species in a record

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ANSWER

Karif crop

Posted by Prachi Bansal 7 years, 4 months ago

CBSE > Class 08 > Science

4 answers

Jayesh Chaudhari 7 years, 4 months ago

Kharif crops are grown from July to October during the monsoon .these crops needs more water.ex wheats,oats,barely etc

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Rahul Phani 7 years, 4 months ago

The crops which are grown in rainy season are called kharif crops

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Sreemayi Ronanki 7 years, 4 months ago

The crops which are grown in the rainy season for june to september is known as kharif crops

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Vinayak Pal 7 years, 4 months ago

Those crops which are sown in rainy season

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ANSWER

Defination of extinct

Posted by Khushi Garg 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Sakshi Gupta 7 years, 4 months ago

A species of a plants and animals are not found in any part of the world.

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Khushi Garg 7 years, 4 months ago

A species of animals or plants that extinct no longer as any living member either in the world or in a particular place

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ANSWER

Bat have very poor eyesight But bat fly in the dark

Posted by Avi Jain 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Roshan Raj 7 years, 4 months ago

Because of ultrasonic rays and by ultrasonic rays only they are able to find their prey also.

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Tiksha Gupta 7 years, 4 months ago

Because of ultraviolet rays

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ANSWER

Define cell membrane

Posted by 24 Šhůvå 08 7 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Akanksha Sandhu 7 years, 4 months ago

It is a thin membrane that enclosed the content of the cell

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Savneet Kaur 7 years, 4 months ago

In plants that is cell wall

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Legend _Paul 7 years, 4 months ago

The outer boundary of each cell is called plasma membrane or cell membrane

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ANSWER

What are common similarities between all organisms

Posted by Tisha Verma 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Charul Malik 7 years, 4 months ago

Made up from cells

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Soumya Pandey 7 years, 4 months ago

They are made up of cells

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ANSWER

What is the full form of VIRUS

Posted by Aashu Kumar 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Md Kaif 7 years, 4 months ago

Vital Information Resource Under Seize, in computer

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ANSWER

Do distilled water conduct electricity

Posted by Aswin Manu 7 years, 4 months ago

CBSE > Class 08 > Science

4 answers

Roshan Raj 7 years, 4 months ago

No,because distilled water (pure water)is an insulator of electricity. That is why it does not conduct electricity.

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Charul Malik 7 years, 4 months ago

No distilled water does not conduct electricity

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Legend _Paul 7 years, 4 months ago

No distilled water doesn't conduct electricity because distilled water is not the mixture of acid Base and salt

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Ankur Tiwari 7 years, 4 months ago

Clear your question

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ANSWER

May I know history of matchstick in short?

Posted by Ankur Tiwari 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Ankur Tiwari 7 years, 4 months ago

Means how was matchstick created

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Pari Kasaudhan 7 years, 4 months ago

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ANSWER

Wath is terylene

Posted by Mayank Yadav 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Terylene is a popular polyester which is used in dress materials. Terylene is an artificial textile fibre made from polyester, it is used to make light, crease-resistant clothing, bed linen, and sails.

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ANSWER

Define protected areas

Posted by Tisha Verma 7 years, 4 months ago

CBSE > Class 08 > Science

7 answers

Sakshi Gupta 7 years, 4 months ago

Those area where the animals and plants are safe and survive easily.

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Roshan Raj 7 years, 4 months ago

Those area are built to keep safe the endangered species from extintion.

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Charul Malik 7 years, 4 months ago

Wildlife sanctuaries

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Ankur Tiwari 7 years, 4 months ago

Those places are Sanctuaries,National parks, etc

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Ankur Tiwari 7 years, 4 months ago

Tina I think Those places which are suitable for surviving of endangered species and they are separated from any disturbance,may called protected areas

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Tisha Verma 7 years, 4 months ago

Tell me the answer

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Tisha Verma 7 years, 4 months ago

Tell me the areas

3Thank You

ANSWER

What I friction

Posted by Arun Madas 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Sakshi Gupta 7 years, 4 months ago

The force which opposes the relative motion and the two surfaces are in a contact.

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Aashu Kumar 7 years, 4 months ago

The force which opposes the relative motion between two surfaces in contact is called friction

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ANSWER

Who invented vaccine on small pox

Posted by Pavithra Kumaran 7 years, 4 months ago

CBSE > Class 08 > Science

5 answers

Sakshi Gupta 7 years, 4 months ago

Edward jeener

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Vaishnavi. M Vaishnavi. M 7 years, 4 months ago

Edward Jenner

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Beenay Kumar 11989 Prasad 7 years, 4 months ago

1789 Answer

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Aashu Kumar 7 years, 4 months ago

Sir Edward Jenner in 1789

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Sonali Aggarwal 7 years, 4 months ago

Edward Jenner discovered the vaccine for small pox in 1798.

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ANSWER

Why are viruses considered to be on the borderline between the living and the non-living?

Posted by Madhu Mohana 7 years, 4 months ago

CBSE > Class 08 > Science

4 answers

Sakshi Gupta 7 years, 4 months ago

Because they are crystilaized and stored in a jar for a millions of a years. And then comes to contact in any living beings or non living they multiply it.

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Sreemayi Ronanki 7 years, 4 months ago

It is becouae the only act or reproduce in a host bodY

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Roshan Raj 7 years, 4 months ago

Virus are considered as the borderline of living and non living because when they are outside the human body they react like non living but as they enter inside the human body they react like living

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Yogita Ingle 7 years, 4 months ago

Viruses are considered at the borderline of living and non-livingbecause they show both the characteristics of a living and a non-living. As they reacts like non-living in the free atmosphere but when they enter in the body of a living organism then they shows the features of a living organism and starts reproduction. Some special features of being a living are that DNA and RNA codesare present in them.
special features of being a non-living are that they do some functions like excreation and can't multiply by own.

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ANSWER

Name the contact forces and explain with one example

Posted by Sahij Buttar 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

A contact force is a force between two objects that are in contact with each other directly or indirectly. Examples of contact forces are muscular force and frictional force . The force resulting from the action of muscles is called the muscular force. We make use of muscular force of animals like bullocks, horses and camels to get our activities done. The point where the force is applied on an object is called the point of application of force (or point of contact). Friction is another type of contact force that always acts opposite to the direction of motion of the objects.

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ANSWER

Chemicals added to food to prevent growth of microorganisms

Posted by Sreesanth Panda 7 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Sakshi Gupta 7 years, 4 months ago

Sodium banzoate and meta bisulphite

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Sreemayi Ronanki 7 years, 4 months ago

Sodium benzoate Sodium metabisulphite

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Soumya Pandey 7 years, 4 months ago

Preservatives.Ex- sodium benzoate

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ANSWER

Aluminium is used in making cooking utensils. Give reason

Posted by Raghav Bichali 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Aluminium is highly reactive metal. When aluminium is exposed to air it reacts with oxygen and forms a white thin layer of aluminium oxide on its surface. This layer forms protective coating on aluminium and prevents the reaction of aluminium with oxygen. Aluminium metal with this protective layer is used for making cooking utensils.

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ANSWER

Copper is used in making electric wires. Give reason

Posted by Raghav Bichali 7 years, 4 months ago

CBSE > Class 08 > Science

4 answers

Sakshi Gupta 7 years, 4 months ago

Because copper is a good conductor of electricity

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Roshan Raj 7 years, 4 months ago

Because copper is a good conductor of electricity and it is cheaper than gold and silver.

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Khushi Nain 7 years, 4 months ago

Because copper is good conductor of electricity.?

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Khushi Nain 5 years, 9 months ago

Because copper is a good conductor of heat. ?

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ANSWER

Why humans not have a cell wall

Posted by Shreya Anthal 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Ritendra Sharma 7 years, 4 months ago

Because for example if natural calamities like cyclone we are suddenly go inside but plant didnot move so plant have and extra protection

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ANSWER

Explain the story of coal

Posted by Tarmeem Khanam 7 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Sakshi Gupta 7 years, 4 months ago

Coal is found deep inside the surface of a earth. Coal is mainly used for cooking and generating electricity. The world wide coal is a produce a lot of smoke in the atmosphere

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Roshan Raj 7 years, 4 months ago

Million of years ago the remain of plants and animals that buried under molten lava is cooled of for many years and finally archaeologists find coal from the earth interior

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Yogita Ingle 7 years, 4 months ago

During the carboniferous age, the earth had large amounts of plant life and dense forests in swampy and low-lying wetland areas. Plants and other life forms, after their death, drifted down to the bottom of the swamps, where they were compressed and decomposed to form peat.
Coal was formed due to the compression of the peat at high temperature and pressure. As coal was formed from the remains of vegetation, it is also called a fossil fuel.

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ANSWER

What are the types of combustion

Posted by Ananya Mahajan 7 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Charul Malik 7 years, 4 months ago

Rapid ,slow , spontaneous , explosive

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Sagar Sachdeva 7 years, 4 months ago

Rapid combustion, slow combustion and spontaneous combustion

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Raghav Bichali 7 years, 4 months ago

Rapid combustion , spontaneus combustion , explosion

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ANSWER

What is crop? Give examples

Posted by Diya Bhati 7 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Sakshi Gupta 7 years, 4 months ago

Crop fulfil our needs in a various ways

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Sagar Sachdeva 7 years, 4 months ago

When plants of the same type are grown in an area on large scale. Ex maize, rice, wheat

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Soumya Pandey 7 years, 4 months ago

Same type of crop grown on piece of land at a same time. Ex- maize rice wheat paddy etc

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ANSWER

What will happen if a rubber sucker press on a rough surface

Posted by Legend _Paul 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Arushi Chandurkar 7 years, 4 months ago

The sucker would make the area prone to it,in vaccum

1Thank You

Legend _Paul 7 years, 4 months ago

1Thank You

ANSWER

How does flat and broad feet of camel help him

Posted by Legend _Paul 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Roshan Raj 7 years, 4 months ago

Broad feet of a camel exert less pressure on sand because as we know that large area exert small pressure and small area exert great pressure .In this way their feet help them to walk easily on sand

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Yogita Ingle 7 years, 4 months ago

To spread their weight out over the sand, which helps to prevent them from sinking in to it. Camels are adapted to walk long distances in deserts, hence, they have evolved to form large, broad, flat feet. More surface area means less pressure exerted on that surface, and vice-versa as the pressure is distributed on a large area.

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ANSWER

What is resaultant force

Posted by Legend _Paul 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

The Resultant force is defined as the total force acting on a body along with their directions. When the object is at rest or travelling with the same velocity, the resultant force has to be zero. Since all the forces are acting towards the same direction, the resultant force should be same for all the forces.

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ANSWER

Agriculture

Posted by Sonu # Jaat # 7 years, 4 months ago

CBSE > Class 08 > Science