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

The type of alcohol in the alcoholic drinks we drink is a chemical called ethanol.To make alcohol, you need to put grains, fruits or vegetables through a process called fermentation (when yeast or bacteria react with the sugars in food - the by-products are ethanol and carbon dioxide).

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An object experiences a net NON ZERO force. Is it possible for the object to move with a constant speed along a straight line?

Posted by Ananya Anand 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 7 months ago

Any object which face non zero force will have some change in speed if the body is at rest or moving. so it is not possible to travel with constant speed.

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Some times in an electric circuitbulb does not glow even if liquid is conducting.give reasons behind this?

Posted by Krrish Sewak 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

An electric bulb glows due to the heating effect of electric current. This means the filament of bulb gets heated to a high temperature and it start growing. However if the current through a circuit is too weak the filament does not get heated sufficiently and it does not glow. Sometimes an electric bulb does not glow even if it is connected to the cell. A break in the filament of an electric bulb means a break in the path of the current between the terminals of the electric cell. Therefore, a fused bulb does not light up as no current passes through its filament.

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Where are weeds?How can we control them?

Posted by Shalinee Kumari 6 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Prinshu Patel 6 years, 7 months ago

They grow in field along with plants . We can control them by putting fertilizers on it

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Shalinee Kumari 6 years, 7 months ago

You Mannerless

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Dheeraj Gururani 6 years, 7 months ago

pagal

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Shalinee Kumari 6 years, 7 months ago

Any undesirable plant may grow naturally along with the crop. These undesirable plants are called weeds

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What is organic fertilizer

Posted by Shobha Kumari Pal 6 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Avika Gupta 6 years, 7 months ago

Natural waste

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Anurag Gupta 6 years, 7 months ago

Organic Fertilizer is derived from animal waste,animal excreta,and human excreta.

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What is respiration!

Posted by Piyush Maurya 6 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Aryan Shankar 6 years, 7 months ago

Respiration is the process of taking oxygen using it for releasing energy for breaking down the food particles in the presence of oxygen .

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Anurag Gupta 6 years, 7 months ago

Respiration is the process of producing enengy with the help of oxygen

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Three holes A B C are made in an empty can't different levels one the other they are closed with an adhesive tape. The can is now filled with water what will you observe when the tap is pulled out justify your answer

Posted by Mahi Manokamna 6 years, 7 months ago

CBSE > Class 08 > Science

0 answers

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Derive the formula of Area of circle.

Posted by Shoaib Akhtar 6 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Piyush Maurya 6 years, 7 months ago

2×22/7×radius

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Dharmendra Kushwaha 6 years, 7 months ago

If are you agree the message yes

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Dharmendra Kushwaha 6 years, 7 months ago

I can tell you but it is very tedious process to derive the formula of area of circle

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Give reason: Blended fabrics are more comfortable to wear than synthetic fabrics.

Posted by Sneha Dua 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

Blended Fibres are considered better than individual synthetic fibres because they show the advantages of 2 or more fibres. Blended are better than synthetic fibres because blended fabrics have quality of synthetic and natural fibres so they are more pbetter than them. These fabrics are admired for excellent coloring effect, mesmerizing design, optimum softness and stylish pattern. The main idea of blended fabrics is to combine fibers with certain qualities with fibers of other qualities that compliment each other. Cotton and polyester are example of blend fabrics.

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What is pituitary gland ?!!

Posted by Angel Gautam Av 2124 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Angel Gautam Av 2124 6 years, 6 months ago

No one knows. ?

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Define the nitrogen cycle

Posted by Sajjan Singh 6 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Kishore Subramanian 6 years, 7 months ago

The series ic process by which nitrogen and its compounds are inter converted in the environment and in living organism including nitrogen fixation and decomposition is called nitrogen cycle

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Somya Kumari 6 years, 7 months ago

The series of process by which nitrogen and its compunds are inter converted in the environment and in living organism including nitrogen fixation and decompostion is called nitrogen cycle

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The effect of a force may change by changing the direction of the applied force. True or False

Posted by Rekha Devi 6 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Aryan Raj 6 years, 7 months ago

True

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Rose Garg 6 years, 7 months ago

What is bacteria

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Who is the carrier of dengue

Posted by Mehak Palak 6 years, 7 months ago

CBSE > Class 08 > Science

5 answers

Mehak Palak 6 years, 6 months ago

Your answer is right angel and shublata

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Shubhlata Sapehia 6 years, 7 months ago

No. In book it is written

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Harshit Chauhan 6 years, 7 months ago

False

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Angel Gautam Av 2124 6 years, 7 months ago

Your answer is wrong ☝️ It's only Aedes mosquito

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Shubhlata Sapehia 6 years, 7 months ago

In my opinion, female Aedes mosq2

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Disadvantages of plastic use

Posted by Ujwal Rabha 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Neena Arora 6 years, 7 months ago

Plastic is non biodegradable It does not decompose easily Contains toxins which can be harmful to our health

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Formula of fitkree

Posted by Shivansh Prajapati 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

KAL(SO4)2

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Write a paragraph in your own words on each the following ?

Posted by Poonam Angira 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Raj Kumar 6 years, 7 months ago

Weeding

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How plate boundries move

Posted by Pushpanjali Kumari 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

The plates of our Earth move due to the intense heat of our core which causes the molten magma to move

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New agricultural machines names pictures and uses

Posted by Swami Keidongbam 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Vivek Sanwariya 6 years, 7 months ago

You can easily find it on the ncert book ok science the imformation and picture is given properly?

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Who discover pathogen

Posted by Shubhlata Sapehia 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

Louis pasture

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What do you mean by weeding

Posted by Av Bhari 6 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Dharmendra Kushwaha 6 years, 7 months ago

The removal of unwanted plants that grow with crops is called weeding.

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Shivansh Prajapati 6 years, 7 months ago

Wedding involves removal of unwanted or uncultivated plant

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Brain Tricks 6 years, 7 months ago

Weeding is a unwanted and uncultivate plants in grow in crop of side is call weeding

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Shubhlata Sapehia 6 years, 7 months ago

In my opinion, it is a process of removing weeds

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Chp-1 Crop production and management Q5 explain how fertilizersbare different from manuer

Posted by Shreyash Gaming 6 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Dharmendra Kushwaha 6 years, 7 months ago

Fertilizer are inorganic nutrients where as manure are organic nutrients. Fertilizer are prepared in the factory where as manures are prepared in the field. Fertilizer are rich in nutrient like potassium, nitrogen and phosphorus where as manure are rich in compost nutrients. Fertilizer are harmful for the soil where as manure are friendly.

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Shivansh Prajapati 6 years, 7 months ago

Fertilizer is man made in organic salt. Manure is natural substance obtained from decomposition of cattle dung and plant resides. Fertilizers are produced is factories. Manure can be prepared in field

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Parvinder Singh 6 years, 7 months ago

Manure is an organic substance obtain from the plants and animals waste but fertilizer are inorganic substance prepared in factories.

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Shubhlata Sapehia 6 years, 7 months ago

Fertilizers is prepared in factories. Manure can be prepared in the fields.

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Which mosquito spread dengue

Posted by Jhanvi Pandey 6 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Dharmendra Kushwaha 6 years, 7 months ago

Aedes aegypti

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Rakesh Kumar Rakesh Kumar 6 years, 7 months ago

Female Aedesmosquito spread dengue.

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Deepinder Brar 6 years, 7 months ago

Female Aedes mosquito

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Shreyash Gaming 6 years, 7 months ago

Dengue mosquito

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What are micro organisms

Posted by Harshit Garg 6 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Rakesh Kumar Rakesh Kumar 6 years, 7 months ago

Living organisms around us which we normally cannot see.these are caller microorganisms and microbes.

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Shreyash Gaming 6 years, 7 months ago

The small living thing which can be seen only by microscope is called micro organism

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Dharmendra Kushwaha 6 years, 7 months ago

The tiny living organism which can only seen though microscope are called micro organism. e.g lactobacillus

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Explain how the soil is affected by the continuous plantation of crops in a field

Posted by Jai Agnani 6 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Shivansh Prajapati 6 years, 7 months ago

Due to the continuous plantation of crops in a field soil become poor in certain nutrients such as nitrogen Phosphorus potassium etc. plant requires nutrients for their proper growth and functioning which get affected by the continuous plantation of crops in a field

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Yogita Ingle 6 years, 7 months ago

Continuous plantation of crops in a field makes the soil poor in certain nutrients such as nitrogen, phosphorus, potassium, etc. Plants require nutrients for their proper growth and functioning. When a farmer continues to grow’ crops one after the other, then all nutrients available in the soil reduce and the crop yield decreases automatically.

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Example to show that plastic are non corrosive in nature

Posted by Anushk Vijay 6 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Rakesh Kumar Rakesh Kumar 6 years, 7 months ago

Plastic are non-corrosive in nature.plastics do not react witb air,water etc.so,they do not get corroded. Examples:- 1.diffrent chemicals are stored in plastic bottles. 2.water is kept into plastic bottles. 3.pickles and food items are stored in plastic containers.

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Ritanjali Sahoo 6 years, 7 months ago

x. x x

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Yogita Ingle 6 years, 7 months ago

Plastics are non-corrosive in nature even if they come in contact with strong chemicals which is because of their non-reactive nature with most of the materials. For example, the cleaning chemicals that we use at home are stored in plastic bottles, instead of metal containers.

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What is metal copound and non metal compound

Posted by Neha Kumar 6 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

A metal compound is a component that contains one or more metal element bonded to another element while non metal material are those material that don't conduct heat and electricity and are structurely brittle.

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Why should we cover our nose and mouth with handkerchief while sneezing? Explain in brief.

Posted by Devanshi Yadav 6 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Alok Kumar 6 years, 7 months ago

We put on handkercheif because it releze bacteria which is harmful for another person

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Yogita Ingle 6 years, 7 months ago

One should keep a handkerchief on the nose or mouth while sneezing because sneezing releases bacteria which could be harmful to another person around and cause them to fall sick.
So it is advisable to cover our mouth with a handkerchief or our hand to prevent such undesirable event happening because of us.

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What are modern methods of agricultural practice

Posted by Purva Kushwaha 6 years, 7 months ago

CBSE > Class 08 > Science