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What agricuter

Posted by Mohit Kumar 7 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 7 months ago

The growing of crops in the fields for obtaining food is called agriculture. The people who have no permanent homes and continuously move from one place to another are called nomads. Till about 10000 B.C., people were nomadic and ate fruits and vegetables found in nature and started hunting animals for food. Later, they settled near sources of water and cultivated land to produce wheat, paddy and other food crops. This is how agriculture originated.

ANSWER

Define vaccine

Posted by Sarthak Surale 7 years, 5 months ago

CBSE > Class 08 > Science

4 answers

Riya Priyadarshini 7 years, 5 months ago

Dilute strains of dead or weak microbs introduced to our body in the form of injections or oral drops is called as vaccine.

Nutan Raj 7 years, 5 months ago

A vaccines is a prepration of killing or weakend disease - causing microbes. When a vaccines introduces in our body of healthy person the body produce antibiotics

Aryan Khandelwal 7 years, 5 months ago

a vaccine is used to protect the child from diseases

Gaura Agarwal 7 years, 5 months ago

A vaccine is a preparation of killed or weakened disease-causing microbes.

ANSWER

Nature of non metal and metal oxide

Posted by Chiranjeev Parker 7 years, 5 months ago

CBSE > Class 08 > Science

3 answers

Vishal Singh 7 years, 5 months ago

No, these answers are wrong. Metal oxide- basic in nature. Non-metal oxide-acidic.

Royal Girl 7 years, 5 months ago

basic

Aman Sharma 7 years, 5 months ago

Yes

ANSWER

What is fermentatin

Posted by Abhishek Kumar 7 years, 5 months ago

CBSE > Class 08 > Science

4 answers

Nutan Raj 7 years, 5 months ago

Conversion of sugar into alcohol or acid by action of micro-organism is known as fermentation

Kanishka Dodwal 7 years, 5 months ago

Conversion of sugar into alcohol or acid by the action of microorganisms

Sonali Aggarwal 7 years, 5 months ago

Fermentation is a metabolic process that consumes sugar in the absence of oxygen and presence of yeast .

Akshay Tara 7 years, 5 months ago

Convertion of sugar into alcohol by the yeast this process is called fermentation

ANSWER

Rana want to buy shirt for summer should he buy cotton shirt or shirt made from synthetic material advise Rana giving your reason

Posted by Shruti Rai 7 years, 5 months ago

CBSE > Class 08 > Science

6 answers

Akp P 7 years, 5 months ago

Rana should by cotton shirts because- 1-cotton absorbs the sweat. 2-the pores in the cotton allows easy evaporation and keeps the body cool. 3-on the other hand ,synthetic shirts do not absorb sweat hence are very uncomfortable in summer.

Darsh Sharma 7 years, 5 months ago

Rana should buy the shirt made from cotton because cotton is a good absorber.Thus,when he sweat in summer the cotton absorb the sweat and give him cooling

Anirudh Dabas 7 years, 5 months ago

he should order online so that he will get to know that which type of shirts are on sale.

Ab Cd 7 years, 5 months ago

Rana should buy cotton shirt because :) it is lighter in wieght . :) it absorbs sweat coming from our body and expose it into the environment . :) Helps to evaporate sweat that cool our body.

Ali Kutty 7 years, 5 months ago

rana buys cotton in summer because it absorbs air

Vishal Singh 7 years, 5 months ago

Rana should buy a cotton shirt for summer because the cotton absorb the sweat coming out of our body .

ANSWER

Can you help me by giving some science First chapter questions for examination.. pls

Posted by Neha Nishal 7 years, 5 months ago

CBSE > Class 08 > Science

6 answers

Neha Nishal 7 years, 5 months ago

Thank u very much you help me to write exam easily

Nutan Raj 7 years, 5 months ago

Discuss how soil is prepared for sowing seeds

Kanishka Dodwal 7 years, 5 months ago

What are Rabi and Kharif crops?

Kanishka Dodwal 7 years, 5 months ago

What are the modern and traditional methods of irrigation?

Kanishka Dodwal 7 years, 5 months ago

What are agricultural practices? List them in sequence.

Khushi Nain 7 years, 5 months ago

What is crop rotation?

ANSWER

Who discovered fermantation and in which year ?

Posted by Sumit Singh 7 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Radhika Parwal 7 years, 5 months ago

Louis Pasteur in 1857

ANSWER

Which material is called black gold and why

Posted by Shivam Agarwal 7 years, 5 months ago

CBSE > Class 08 > Science

4 answers

Khushi Nain 7 years, 5 months ago

Petroleum is called black gold because it is black in colour and as precious as gold.?

Vishal Singh 7 years, 5 months ago

Coal because we get it in deep of the earth and is of black colour

Ab Cd 7 years, 5 months ago

PETROLEUM . Because of its great commercial importance

Akanksha Raj 7 years, 5 months ago

coal

ANSWER

define efficiency of fuel

Posted by Ayush Gautam 7 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Ab Cd 7 years, 5 months ago

It is expressed in term of a its calorific value which is expressed in units of kilojoule per kg

ANSWER

Why aeroplane can fly in presence of huge ?gravitational force

Posted by Vaishnavi Singh 7 years, 5 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

What is the properties of coke?

Posted by Saumya Singh 7 years, 5 months ago

CBSE > Class 08 > Science

2 answers

Vishal Singh 7 years, 5 months ago

Coke is tough, spongy, porous , have a bad smell and black . It is also the pure form of carbon

Ab Cd 7 years, 5 months ago

It is tough , spongy,and black sustance. It is almost the pure form of carbon .

ANSWER

What is friction?

Posted by Sujal Bora 7 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Khushi Raj 7 years, 5 months ago

Fristion is a external agent which causes to change position of an object it always act in opposite direction of motion

ANSWER

You use apencil and a eraser . With repeated use this shape and size change can we reverse this change what is such changes called

Posted by Tripat Jeet 7 years, 5 months ago

CBSE > Class 08 > Science

2 answers

Khushi Raj 7 years, 5 months ago

We cannot reverse the shape and size of eraser and pencil so i think it is chemical change

Sujal Bora 7 years, 5 months ago

No it cant be reversed it ia a physical change because in this case only physical properties are changed

ANSWER

What are bacteria

Posted by # Singh 7 years, 5 months ago

CBSE > Class 08 > Science

4 answers

Nutan Raj 7 years, 5 months ago

Bacteria are unicellural and exist everwhere; air,water,soil and in the bodies of other living organisms

Ab Cd 7 years, 5 months ago

It is a microscopic single -celled organisms.

Shivam Agarwal 7 years, 5 months ago

Bacteria is a group of unicellular which have cell wall

Khushi Raj 7 years, 5 months ago

Bacteria is a group of unicellular which have cell wall but not cell organelles

ANSWER

while preparing chapatis Paheli found that the flour to be used was mixed with wheat grains.

Posted by Tripat Jeet 7 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Anamika Kumari 7 years, 5 months ago

Vhvv

ANSWER

How do you proof the nature of metallic oxide

Posted by Ridhima Rana 7 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Sonali Aggarwal 7 years, 5 months ago

Metal oxides are basic in nature because they react with water to form strong bases while non metallic oxides react with water to form acids which means they are acidic in nature.

ANSWER

What is agriculture practices

Posted by Adarsh Tripathi 7 years, 5 months ago

CBSE > Class 08 > Science

5 answers

Adarsh Tripathi 7 years, 5 months ago

Cultivation of crops involves several activities undertaken by farmers over a period of time these activities or tasks are referred to as agricultural practices.these activities are listed below 1- preparation of soil 2- sowing 3- adding manure and fertilisers 4- irrigation 5- protecting from weeds 6- harvesting 7- storage

Vishal Singh 7 years, 5 months ago

In order to give food to our growing population we need to adopt some agricultural practices

Sonali Aggarwal 7 years, 5 months ago

Various activities performed by the farmer from sowing of crop till harvesting of crop are called agricultural practices.

Kanishka Dodwal 7 years, 5 months ago

For growing crops farmer performs a series of activities over a period of time in a particular series these are called agriculture practices.

Adarsh Tripathi 5 years, 9 months ago

When plants of the same kind are grown and cultivated at one place on a large scale, it is called a crop

ANSWER

What is nitrogen

Posted by Saurav Yadav 7 years, 5 months ago

CBSE > Class 08 > Science

2 answers

Nash Hydrews 7 years, 5 months ago

It is a type of gas which covers 71% in the atmosphere

Apoorvi Bhatiya 7 years, 5 months ago

Nitrogen is a type of gas

ANSWER

How red phosphorus converted into white???????

Posted by Saumya Kumari 7 years, 5 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

What is the definition of vaccine?

Posted by Nikitha Nair 7 years, 5 months ago

CBSE > Class 08 > Science

3 answers

Nash Hydrews 7 years, 5 months ago

Vaccine is a antibody which protects from diseases

Sudeshna Sahoo 7 years, 5 months ago

Vaccines are the substances used to produce immunity to diseases in the living body.

Kanishka Dodwal 7 years, 5 months ago

Vaccine is a preparation of dead and weekend disease causing bacteria. When a vaccine is introduced in the body of a healthy person it produce antibodies which produces antibiotics which protect our body for future posibble infections from the same disease.

ANSWER

What is thermosetting plastic?

Posted by Himanshu Kashyap 7 years, 5 months ago

CBSE > Class 08 > Science

3 answers

Kanishka Dodwal 7 years, 5 months ago

Plastic which do not soften on heating and cannot remoulded are Thermosetting plastic

Shah Khushi A 7 years, 5 months ago

тнere are ѕoмe plaѕтιcѕ wнιcн wнen мoυlded once, can noт вe ѕoғтend вy нeaтιng .тнeѕe are called тнerмoѕeтιng plaѕтιcѕ. eхaмple: вacĸelιт and мelaмιne.

Aryan Kaushal 7 years, 5 months ago

Plastic which can melt in heating is known as thermosseting plastic

ANSWER

Define drag

Posted by Vedant More 7 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Sudeshna Sahoo 7 years, 5 months ago

Drag is the force exerted by fluids.

ANSWER

Which is the hottest part of flame dark zone OR luminous zone OR non luminous zone ? List it .

Posted by Ab Cd 7 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Kanishka Dodwal 7 years, 5 months ago

Non luminous zone

ANSWER

Describe the dark zone of candle flame?

Posted by Ab Cd 5 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Kanishka Dodwal 7 years, 5 months ago

Coolest

Umsalma Rifaya 7 years, 5 months ago

Black flame

ANSWER

Defination of algae

Posted by Aditi Shivhare 7 years, 5 months ago

CBSE > Class 08 > Science

8 answers

Sudeshna Sahoo 7 years, 5 months ago

The unicellular or multicellular (spirogyra,fucus etc)which are green in colour and vapable of making their own food is known as algae.They lives in water.

Kanishka Dodwal 7 years, 5 months ago

Algae are the group of some simple plants. They have chlorophyll and carry out photosynthesis.

Yash Gupta 7 years, 5 months ago

Its a type of bacteria in green colour mainly found in water

Samhan Rawoot 7 years, 5 months ago

Algae is a type of bacteria in green colour

Ab Cd 7 years, 5 months ago

A microorganism which is seen like a green stagnant paches and mostly find in group.

Bhumika Madan 7 years, 5 months ago

Algae is a type of bacteria which .it present in a huge group not ex. blue -green algae

Sonali Aggarwal 7 years, 5 months ago

A group of photosynthetic organisms that in general possess pigments such as chlorophyll but lack true roots, stems and leaves.

Royal Girl 7 years, 5 months ago

it is a type of bacteria

ANSWER

What is pasteurisation

Posted by Shiv Kumar 7 years, 5 months ago

CBSE > Class 08 > Science

5 answers

Sudeshna Sahoo 7 years, 5 months ago

Pasteurization method is used for preserving milk.In this method- 1.milk is heated to about 70 degree Celcius for about 15-30 sec. 2.then quickly cooled(chilled). 3.then store in sterilized bottles or pouches. Heating kills the bacteria present in milk.Quick cooling prevents the remaining bacteria from growing.

Khushi Nain 7 years, 5 months ago

Heating treatment of milk to kill bacteria.

Kanishka Dodwal 7 years, 5 months ago

Heating foodstuff to a high temperature and then cooling it rapidly to kill the harmful disease causing bacteria.

Aryan Kaushal 7 years, 5 months ago

It is a method to make milk bacteria free. This metgod is done by louis paster. A us chemist

Sonali Aggarwal 7 years, 5 months ago

Pasteurisation is the process used to preserve milk in big dairies.In this process first the milk is heated for 15 to 30 seconds to kill the bacteria and then it is cooled very quickly to a low temperature to prrvpre any remaining bacteria from growing further.The this milk is stored in refrigerators.

ANSWER

Difference between metals and non metals

Posted by U.V.S Revanth 7 years, 5 months ago

CBSE > Class 08 > Science

3 answers

Aryan Kaushal 7 years, 5 months ago

Metals are good cundoctor of heat. Is is sonorous. It is lusturous Non metal is a bad cunductor of heat. It is not sonorous. It is not lusturous

Sonali Aggarwal 7 years, 5 months ago

Metals are strong,have high tensile strength, sonorous,lustourous, malleable, ductile and good conductors of heat and electricity.

Non metals are brittle,poor conductors of heat and electricity,dull,have low tensile strength ,soft and are not sonorous.

Jahnvi Sharma 7 years, 5 months ago

metals are soft,lustrous,ductile melleable and can be beaten into thin sheets whereas non metals are hard non lustrous non ductile non melleable and cannot be beaten into thin sheets

ANSWER

Why is space dark?

Posted by Hiya Malhotra 7 years, 5 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Please help me Prove through an activity that the vapours of the wax cause candle burn with a flame

Posted by Riddhi Agarwal 7 years, 5 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

How are forest fires caused?

Posted by Riddhi Agarwal 7 years, 5 months ago

CBSE > Class 08 > Science

2 answers

Sudeshna Sahoo 7 years, 5 months ago

Due to lightning,with a very small percentage started by spontaneous combustionof dry fuel such as sawdustand leaves(reasons for naturally caused forest fires). Due to smoking ,recreation,equipments and miscellaneous(reasons for human caused forest fire).

Syed A. Nafeesa 7 years, 5 months ago

Becoz pf high tempture.

ANSWER

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