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

It is the modern method of irrigation help us to use water economically. This system is very useful on uneven land where sufficient water is not available. The perpendicular pipes having rotating nozzles on the top, are joined to the main pipelines at regular intervals.

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Siddhi Gupta 7 years, 8 months ago

The modern method of irrigation in which the water is under pressure through nozzles spraying water over the field . This is done in areas having sandy soil and on uneven lands.

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Why Tools are meant for cutting and piercing of an object

Posted by Nidhi Gupta 7 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Siddhi Gupta 7 years, 8 months ago

Tools meant for cutting and piercing have sharp edges because they have less area of contact and therefore can apply more pressure while cutting and the cutting becomes easier as the surface area is less more pressure will be applied on the object

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What is light reaction

Posted by Abhishek Rathore 7 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Garvit Chandel 7 years, 8 months ago

In light reaction of photosynthesis only energy in the form of ATP and NADPH2 form while in dark reaction this energy is use to form carbohydrates.

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Why it is necessary to wash the fleece of sheeo

Posted by Priya Patel 7 years, 8 months ago

CBSE > Class 08 > Science

0 answers

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National park in India

Posted by Naresh Kumar 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Aditi Jain 7 years, 8 months ago

Jim Corbett in Uttrakhand

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Sonali Aggarwal 7 years, 8 months ago

Satpura National Park in Madhya Pradesh

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Is the following statement correct ? If it is wrong, correct the statement - - - - Statement :" Unicellular organism do not respite Only multi cellular organism Respite."

Posted by Kunal Pareek 7 years, 8 months ago

CBSE > Class 08 > Science

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Stock maintained to compensate for the shortage due to failure of monsoon is known as

Posted by Yelkapelli Adithya 7 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Sonali Aggarwal 7 years, 8 months ago

Buffer Stock

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What is combine which is used in agriculture? State it's function

Posted by Sinoy Sharma 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Aditi Jain 7 years, 8 months ago

It is a machine used in agriculture which is a harvester as well as a thresher.

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Sonali Aggarwal 7 years, 8 months ago

A combine is a huge machine which cuts the standing cereal crops like wheat in the fields,threshes it and seperates the chaff from grain in one operation.The combine is a combined harvester and thresher

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What is anthrax

Posted by Krish Patel 7 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Sonali Aggarwal 7 years, 8 months ago

Anthrax is a dangerous disease of animals like cattle which is caused by a bacterium.

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What is natural santucary

Posted by Karan Kumar 7 years, 8 months ago

CBSE > Class 08 > Science

0 answers

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Prepation of soil

Posted by Kunal Negi 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Aditi Jain 7 years, 8 months ago

Preparation of soil is the first step before growing the crops. One of the most important task in agriculture is to turn the soil and loosen it. This allows the roots to penetrate deep into the soil. The loose soil allows the roots the breathe easily when they go deep into the soil.

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Jyoti Sheoran 7 years, 8 months ago

The prepration of soil is the frrst step befor growing a crop . One is the most important task in agricultural is to turn and losen it

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what is antibodies

Posted by Chetan Gupta 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Shweta Sharma 7 years, 8 months ago

Anti bodies is one type of medicine given to baby at very young age because in future if they have any Dease so the body produce antibodies to fight

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Aditi Jain 7 years, 8 months ago

When the disease-carring microbe enters our body, the body produces antibodies to fight the invader.

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The S. I. Unit of pressure is

Posted by Ankit Singh 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Jahnvi Agarwal 7 years, 8 months ago

Pascal

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Anup Ray 7 years, 8 months ago

Pascal

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why do fertilizers are to used by farmers

Posted by Vidhya Sai Kothakota 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Jahnvi Agarwal 7 years, 8 months ago

They spray them by covering their bodies as it is harmful for skin

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Sonali Aggarwal 7 years, 8 months ago

Fertilizers have plant nutrients in a concentrated form.So they provide quick replenishment of plant nutrients in the soil and restore fertility.So fertilizers are used by the farmers.

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Why viruses are considered on the border line of living and non-living?

Posted by Ankur Nisha 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Jahnvi Agarwal 7 years, 8 months ago

Because when they are in environment they are inactive and when they enter into living organism they are active

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Sana Khan 7 years, 8 months ago

Because viruses are generally dead but when they are on cell of host organism they become alive

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How dos bull gets his hump

Posted by Pawan Singh 7 years, 8 months ago

CBSE > Class 08 > Science

0 answers

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What is chloroplast

Posted by Sagar Kr 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Jahnvi Agarwal 7 years, 8 months ago

It is an organell present only in plant cells which gives them there green colour

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Dikshant Goliyan 7 years, 8 months ago

Chloroplasts are organelles, specialized compartments, in plant and algal cells. The main role of chloroplasts is to conduct photosynthesis,

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What is nylon and rayon

Posted by Rishabh Kumar 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Jahnvi Agarwal 7 years, 8 months ago

Nylon and rayon are synthetic fibres naylon raw material is air water and coal rayon raw material is wood pulp

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Sonali Aggarwal 7 years, 8 months ago

Nylon and rayon are sythetic fibres.Rayon is a man-made fibre made from a natural material called cellulose.Nylon is a man made fibre made without using any natural raw material.

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Friction is a necessary evil. Why? Explain with suitable example.

Posted by Ipshita Garg 7 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Siddhi Gupta 7 years, 8 months ago

Because it helps us to walk,drive without sliding off.we can sit on chair we do our most of the work with the help of friction so thats why it is considered as a necessary evil.

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Method of preservation

Posted by Ayush Bardhani 7 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Shweta Sharma 7 years, 8 months ago

There are many method of preservation such as chemical method , by adding salt ,by adding sugar

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What are the three applications of gases to be used as scents?

Posted by Shivani Mishra 7 years, 8 months ago

CBSE > Class 08 > Science

0 answers

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What are stem cells?

Posted by Sana Khan 7 years, 8 months ago

CBSE > Class 08 > Science

0 answers

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Can microorganism be seen with the naked eye if not how can they be seen

Posted by Siddharth Kumar 7 years, 8 months ago

CBSE > Class 08 > Science

4 answers

Aditi Jain 7 years, 8 months ago

No, microorganisms cannot be seen with naked eyes. These can be seen with the help of microscope because they are very small in size.

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Rishabh Kumar 7 years, 8 months ago

No it can't be seen with neked eyes it can be seen with the help of microscopes

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Jahnvi Agarwal 7 years, 8 months ago

No they cant be seen with the naked eyes they can be seen only by a microscope

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P Rana 7 years, 8 months ago

No,by microscope

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What is plant cell and animal cell?

Posted by Nimina Anne Nixon 7 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Jahnvi Agarwal 7 years, 8 months ago

The cell of an plant has all the things as compared to animal ceel accept cell wall and plastids vacuole is in both cells plant has one vacuole while animal cell has several

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Annant Parashar 7 years, 8 months ago

Plant cell have cell wall;vacuole ; plastids; while animal cell doesn't have any of them

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What came first hen or egg and give reason.

Posted by Goutam Giri 7 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Sumeet Kumar Pandab 7 years, 8 months ago

That depends on the case if u want roasted chicken than egg will come from that egg hen will come and u can eat it and if u want omelets than hen will come it will give egg and u can have your omlette

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it is not advisable to wear synthetic clothes while working in tha kitchen. Why?

Posted by Umashanker Sharma 7 years, 8 months ago

CBSE > Class 08 > Science