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

Polymers are high molecular mass (10³ - 10⁷u) substances consisting of a very large number of simple repeating structural units on a large scale.
Some examples are : Polythene, nylon 6, 6, bakelite, rubber etc.

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What is reproductive organs

Posted by Yatharth Chaudhary 3 years ago

CBSE > Class 08 > Science

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Full form of RBC

Posted by Sachin Naik 3 years ago

CBSE > Class 08 > Science

5 answers

Bhumika Bedse 3 years ago

Red Blood Cells

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Yash Agarwal 3 years ago

Red blood cells

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Isha Deshmukh 3 years ago

Red blood cells

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Prati Shaw 3 years ago

Red blood cells

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Sachin Naik 3 years ago

Red Blood Corpulses

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chemical effect of electric current all questions

Posted by Mhima Mishra 3 years ago

CBSE > Class 08 > Science

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Why electric fires are extanguishised with either using CO2 extanguisher or mud not water

Posted by Soumya Sharma 3 years ago

CBSE > Class 08 > Science

2 answers

Akshita Ch 3 years ago

Because water with dissolved salts is a good conductor of electricity and can lead to rapid spread of fire

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Abhigyan Singh 3 years ago

Because if you use water on electric fire it will be increased because water is a good conductor of electricity

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you ar living at c439 pashchim vihar New Delhi 58 your father transfer to Bhopal write a letter to your father describing how you are helping in purchase looking often the house and helping your younger brother and sister in their studies

Posted by Raghubir Singh 3 years ago

CBSE > Class 08 > Science

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How does the body gets charged

Posted by Harshit Kumar 3 years ago

CBSE > Class 08 > Science

4 answers

Mayank Kumar 3 years ago

By lossing or ganing electrone

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Ayush Kashyap 3 years ago

A body can charge by following ways:- 1)Friction 2)Rubbing it

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Shikha Navlani 3 years ago

This charge is called static charge

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Shikha Navlani 3 years ago

A body gets charged by rubbing it with another body

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List the main characteristics oh the image formed by a plane mirror

Posted by Jeet Rahangdale 3 years ago

CBSE > Class 08 > Science

3 answers

Other My Family 3 years ago

Virtual and errect, laterally inversion, same size ,same distance

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Parth Patel 3 years ago

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Debanjan Garai 3 years ago

laterally inverted real same size of the object

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Explain about pressure exerted by liquids and gases

Posted by Akshaya Dilli 3 years ago

CBSE > Class 08 > Science

2 answers

Preeti Dabral 3 years ago

The hydrostatic pressure is the pressure exerted by a fluid at equilibrium at any point of time due to the force of gravity. Hydrostatic pressure is proportional to the depth measured from the surface as the weight of the fluid increases when a downward force is exerted. Fluids exert pressure in all directions equally.

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Vivek Kumar 3 years ago

Carbon

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What is element

Posted by Amit Rolaniya 3 years ago

CBSE > Class 08 > Science

3 answers

Preeti Dabral 3 years ago

An element is a chemical substance that cannot broken down into any simpler substances by chemical reactions. It consists of same kind of atoms only.

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Abhigyan Singh 3 years ago

Hamburger 🍔🍔

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L Basant Kumar 3 years ago

Don't post personal information, mobile numbers and other details.
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class 8 science imp notes of ch 4,8,9,10,11,12,13,14,16,18

Posted by Drashti Jain 3 years ago

CBSE > Class 08 > Science

2 answers

Abhigyan Singh 3 years ago

In book

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Aniket Singh 3 years ago

Important notes of paper

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Are you watching pornhub

Posted by Digvijay Singh Rathore 3 years ago

CBSE > Class 08 > Science

3 answers

Naveen Kumaraaa.. 3 years ago

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Vishal Mourya 3 years ago

Yes

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Kavi. Kumar 3 years ago

What is friction

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Exain how fertilisers are f8fferent from manue ?

Posted by Digvijay Singh Rathore 3 years ago

CBSE > Class 08 > Science

2 answers

Preeti Dabral 3 years ago

A fertiliser is an inorganic salt.Fertilisers are prepared in factories.they have all the three important plant nutrients nitrogen, phosphorous and potassium. They do not emit any bad smell but they cause alot of pollution.ex ammonium sulphate . A fertiliser does not provide any humus to the soil.
Manure is a natural substance obtained by the decomposition of cattle dung, human waste and plant residues. Manure is a natural product. it is prepared naturally in the field. And it mostly doesn't have the three important plant nutrients . Manure provides a lot of humus to the soil.

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Abhigyan Singh 3 years ago

What Preeti Dabral said For your kind information and not a hacker I saw the last answer and there was her/his name

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What is a constellation? (4points )

Posted by Ankit Gupta 3 years ago

CBSE > Class 08 > Science

3 answers

Abhigyan Singh 3 years ago

Stars but in our imagination

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Samiksha Meshram 3 years ago

A group of stars that forms a recognisable shape is called as constellation ex- ursa major ,Orion ,Leo major and cassiopia

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Ritika Khichar 3 years ago

Constellation is a group of star that appear to form a recognisable shape .for ex - ursa major and orion . ( this is in science chapter 16 light )

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Boojho observed that copper is deposited on the electrode connected to the negative terminal of the battery. Paheli tried to repeat the same experiment. But she could find only one copper plate. Therefore she took a carbon rod as a negative electrode. Will copper be still deposited on the carbon rod? Explain your answer.

Posted by Vishal Kumar 3 years ago

CBSE > Class 08 > Science

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Abhigyan Singh 3 years ago

What Vishal Kumar said For your kind information and not a hacker I just saw the last answer and there was her/his name

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Vishal Kumar 3 years ago

No, copper will not be deposited on the carbon rod used as a negative electrode in the experiment. This is because the deposition of copper on the electrode is a result of the reduction of copper ions present in the solution onto the electrode. The reduction of copper ions occurs at the negative electrode, which attracts the positively charged ions towards it. However, for the deposition of copper to take place, the electrode used as the negative terminal should be made of a material that has a lower reduction potential than copper. Copper has a reduction potential of -0.34 V, which means any electrode with a reduction potential lower than -0.34 V can be used as the negative electrode. Carbon has a reduction potential of -0.22 V, which is higher than the reduction potential of copper. This means that carbon is not a suitable material for the negative electrode in this experiment, as it cannot attract the copper ions from the solution and reduce them to form a copper deposit. Therefore, even if Paheli uses a carbon rod as the negative electrode, copper will not be deposited on it as it does not have a lower reduction potential than copper.

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Posted by Vishal Kumar 3 years ago

CBSE > Class 08 > Science

1 answers

Abhigyan Singh 3 years ago

Am not a nerd so i haven't read the question and the answer but after this i think you have lots of doubt

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Define acid rain Easy defenation

Posted by Yuvraj Bhagat 3 years ago

CBSE > Class 08 > Science

3 answers

Abhigyan Singh 3 years ago

Oxides of Sulphur and nitrogen dissolve in rain water and form acids such a rain is called acid rain

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Samiksha Meshram 3 years ago

Oxides of sulfur and nitrogen that dissolved in rain water and form acid . Such rain is called as acid rain.

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Anisha Jankar 3 years ago

Oxides of Sulphur and nitrogen dissolve in rain water and form acids such a rain is called acid rain

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TV screens soon become very dusty.

Posted by Sanya Singh 3 years ago

CBSE > Class 08 > Science

2 answers

Abhigyan Singh 3 years ago

Static electricity builds on the screen of the TV which gives the screen a +ve charge, It becomes a cathode. The now charged screen will now attract particles of dust consisting of anions . Over a period of time a layer of dust form

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Yuvraj Bhagat 3 years ago

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Burning of wood and coal causes____of air

Posted by Kanhiya Tyagi 3 years ago

CBSE > Class 08 > Science

5 answers

Vishal Kumar 3 years ago

Pollution

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Yuvraj Bhagat 3 years ago

Pollution

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Monika Tomar 3 years ago

Pollution

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Swayam Swagat Mohapatra 3 years ago

Pollution

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Kanhiya Tyagi 3 years ago

Pollution

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What are the process of reproduction

Posted by Bhargavi Yadav 3 years ago

CBSE > Class 08 > Science

3 answers

Ritika Khichar 3 years ago

Reproduction ensures the continuity of species and keeps it away from becoming extinct . It increases the number of species and maintains ecological balance.

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Bhargavi Yadav 3 years ago

Thanks

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. . 3 years ago

Reproduction is the process of producing offsprings through which life continues on earth.

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What is cytoplasm and their functions?

Posted by Neel Vaghela 3 years ago

CBSE > Class 08 > Science

2 answers

Monika Tomar 3 years ago

Cytoplasm is the jelly like structure present in between the nucleus and cell membrane. It provides a platform upon which other organelles can operate within the cell. All of the functions for cell expansion, growth and replication are carried out in the cytoplasm of a cell.

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Saee Pingle 3 years ago

Cytoplasm is the jelly like structure between the nucleus and cell membrane

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How is respiratory Anthrax lethal to anyone inhaling the Anthrax spores?

Posted by Pranshu Bhingradia 3 years ago

CBSE > Class 08 > Science

1 answers

Preeti Dabral 3 years ago

Inhalation anthrax starts primarily in the lymph nodes in the chest before spreading throughout the rest of the body, ultimately causing severe breathing problems and shock. Without treatment, inhalation anthrax is almost always fatal.

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Define asexual reproduction describe two method of asexual reproduction in animal with the help of diagram

Posted by Siddhi Pahadiya 3 years, 1 month ago

CBSE > Class 08 > Science

3 answers

. . 3 years ago

Asexual reproduction is the type of reproduction in which only one parent is involved. The two methods of Asexual reproduction are as follows - 1) Binary fission - when one unicellular organism splits into two daughter individual. The nucleus of the parent organism splits into two nuclei. The cytoplasm also divides into two and each contains one nucleus. A constriction is formed so deep that it divides the organism in two. For eg - amoeba 2) budding - In this, a small outgrowth or projection called bud is formed on the body of the parent. The nucleus of the parent organism is divided into two and one goes to the bud. The bud then grows and detaches from the body of the parent and grows as an individual. For eg - hydra.

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Muskan Raj 3 years, 1 month ago

Asexual reproduction is a type of reproduction in which only a single parent is involved.Two methods are:-budding in hydra and fragmentation in sponges.

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Shubham Dubey 3 years, 1 month ago

Asexual reproduction is a reproduction in which only single parent is involved. Two methods of asexual reproduction are budding in hydra and binary fission in amoeba

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A devise which was made by Charles f richter is known as

Posted by Siddhi Pahadiya 3 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Monika Tomar 3 years ago

Richter scale

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. . 3 years ago

Richter scale

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Mantasha Shahin 3 years, 1 month ago

Richter scale

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What is electropating

Posted by Kalash Jain 3 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Monika Tomar 3 years ago

The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating

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Suraj Tiwari 3 years, 1 month ago

The process of depositing a layer of any decibel metal and another material by mean a electricity is known as electroplating

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Assertion:- tin cans, used for storing food, are made by electroplating tin onto iron. Reason:- tin is more reactive than. Thus, food does come into contact with iron and is protected from getting spoil.

Posted by Pratham Bhanushali 3 years ago

CBSE > Class 08 > Science

1 answers

Preeti Dabral 3 years ago

Tin is less reactive than iron

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What is mensuration explain

Posted by Abhay Kumar Nishad 3 years, 1 month ago

CBSE > Class 08 > Science

5 answers

Ankit Gupta 3 years, 1 month ago

It is menstruation not mensuration..

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Riya Kalra 3 years, 1 month ago

If fertilisation does not occur , the released egg , and the thickened lining of the uterus along with its blood vessels are ahed off this cause bleeding in women which is called menstruation

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Ashwin Dwivedi Dwivedi 3 years, 1 month ago

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

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Shubhankar L 3 years, 1 month ago

The bleeding of women that takes place in every 1 month is called menstruation.It means a single ova is matured. Id anyone want to study science free then contact me at telegram @Meyong22

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Yati Sharma 3 years, 1 month ago

Mensuration is the process with produce female ova egg mature to produce bleeding is called mensuration

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Write five sources of air pollution and their effects on living organisam

Posted by Riya Saini 3 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Preeti Dabral 3 years, 1 month ago

There are four main types of air pollution sources: mobile sources – such as cars, buses, planes, trucks, and trains. stationary sources – such as power plants, oil refineries, industrial facilities, and factories. area sources – such as agricultural areas, cities, and wood burning fireplaces.

Harmful effects of air pollution depend on the concentration of pollutants, duration of exposure to the pollutants and types of pollutants that caused pollution.

In plants, it causes fruit damage, leaf damage, chlorosis, necrosis, mottled spots on leaves, less yield of crops and causes premature death of plants, etc.
In humans, it causes respiratory ailments like asthma, hay fever, allergic diseases, etc., cancer and genetic mutations.
Carbon monoxide (CO) released as a pollutant can combine with haemoglobin thus, preventing the supply of O₂ to the cells and causing death due to asphyxiation because it leads to damage of the brain.
The burning of fossil fuels, exhaust from automobiles, etc., release SO₂ and NO₂into the atmosphere. These gases are oxidised to sulphuric acid and nitric acid in the air. They get dissolved with the rainwater falling on the earth and form acid rain.
The various vehicle such as car, buses, trucks running on petrol release harmful gases.

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What is meaning of O2

Posted by B.Ashwinth. Cbs 3 years, 1 month ago

CBSE > Class 08 > Science