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

Function of Iris:- the iris controls the amount of light entering into the eye. Function of Retina:- the purpose of the retina is to receive light that the lens has focused, convert the light into signals and send these signals to the brain for visual recognition. Function of optic nerve:- The job of the optic nerve is to transfer visual information from the retina to the vision centers of the brain via electrical impulses.

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What is dectility and malleabilty which metal would you prefer to make

Posted by Pradeep Kumar 4 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Sanjay Kumar 4 years, 6 months ago

The property of matel by which it can be drawn into wire is called dectility :- copper , gold The property of metal by which it can be beaten into thin sheet is called malleabilty :- copper , silver

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Fire produced by oil can not controlled by

Posted by Anandhu Kannan 4 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Ramu Nishad 4 years, 6 months ago

Don't controlled by water

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Jaideep Hanumant Bhosale Bhosale 4 years, 6 months ago

It could not be controlled by water

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Akhilaishwarya U 4 years, 6 months ago

Water

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What is water pollution? Name two water pollutants.

Posted by Nipun Vilangil 4 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Ramu Nishad 4 years, 6 months ago

The contamination of water throwing a dust in the water with harmful substances is called water pollution. Examples of water pollution throwing a dust by human chemical wastes

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Sakshi Mishra 4 years, 6 months ago

The contamination of water by throwing waste materials or any harmful chemicals is called water pollution. Some examples of water pollutants are--- chemical wastes , plastics etc.

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Aditi Mishra Ix-A 4 years, 6 months ago

When contaminants pollute the water,it is termed as water pollution. Two water pollutants are untreated sewage,waste from industries.

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Fe(s) +H2O(g) -------> Fe3O4 + H2(g)

Posted by Maitha Albedwawi 4 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Tannie Tan⁷ 4 years, 6 months ago

Balanaced chemical equation is: 3Fe(s)+4H2O(g)→Fe3O4(s)+4H2(g)

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Explain Ch-9

Posted by Ranjeet Kumar 4 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Aditi Mishra Ix-A 4 years, 6 months ago

You can study Chapter 9 of science by studying the notes provided here in cbse guide app.

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Dash zone of candle flame is coolest while dash zone of the candle flame is hottest

Posted by Bhumika Bhumika 4 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Jigu Kalesh 4 years, 6 months ago

Hindi mideyam

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Ns Gowda 4 years, 6 months ago

Upper is hottest while the innermost is coldest

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What are the effects of junk food on adolescence(Reaching the age of adolescence- chapter 10)

Posted by Sana Ms 4 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Alisha Anasri 4 years, 6 months ago

Write Examples of metal and metal

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Pragya Bharti 4 years, 6 months ago

We should not eat much junk food....in the age of adolescence...because see in this age our body is being developing...and many changes are also coming...so,in this time as much as possible we should eat green vegetables...which will make us healthy and fit... (I hope you were able to understand)?

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What is explosion combustion, define

Posted by Ajay Kumar Yadav 4 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Ajay Kumar Yadav 4 years, 6 months ago

explosion or explosive

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What is metamorphosis? give example

Posted by Baldev Raj Singh 4 years, 6 months ago

CBSE > Class 08 > Science

5 answers

Baby Singh 4 years, 6 months ago

The transformation of larva into an adult is called metamorphosis. Ex. Frog, butterfly

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Pragya Bharti 4 years, 6 months ago

The transformation of larva into an adult through drastic changes is called metamorphosis. Example of metamorphosis are amphibians like(frogs)and insects (such as silk moth,butterfly,housefly and mosquito and etc). (Hope my answer helps you)??

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Harsheen Khurana 4 years, 6 months ago

The transformation of larva into an adult through drastic changes is known as metamorphosis. Eg fish,frog, starfish etc.

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Lokesh Waran 4 years, 6 months ago

Called*

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Lokesh Waran 4 years, 6 months ago

The formation of a larva into an aduld in the life cycle of silk moth through drastic changes is class metamorphosis

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Why a baker uses yeast to make bread

Posted by Moksh Jain 4 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Ns Gowda 4 years, 6 months ago

As it reproduces itself easily and the quantity becomes large so

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Which material is called black gold and why?

Posted by Shaurya Kapoor 4 years, 6 months ago

CBSE > Class 08 > Science

4 answers

Ramu Nishad 4 years, 6 months ago

Coal is also known as black gold

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Aditi Mishra Ix-A 4 years, 6 months ago

Petroleum is also known as black gold because it is of immense value.

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Tigerholic Divyansh 4 years, 6 months ago

Petroleum is called black gold because when crude oil is extracted from the land it is black in colour.

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Baby Singh 4 years, 6 months ago

Petroleum is called black gold because it is valuable

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Describe brief account on storage of seeds

Posted by Ankur Sharma 4 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Bhoomi Bisht 4 years, 6 months ago

In a genebank, seed storage is the preservation of seeds under controlled environmental conditions which will prolong the viability of the seeds for long periods. ... The temperature, relative humidities, seed moisture contents, containers and distribution arrangements vary between these stores.

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SI unit of pressure

Posted by Jyoti Raghav 4 years, 6 months ago

CBSE > Class 08 > Science

5 answers

Baby Singh 4 years, 6 months ago

Pascal

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V Rock Gamerz 4 years, 6 months ago

PASCAL is the standard unit of pressure

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Shivam Mahaseth 4 years, 6 months ago

Pascal

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Dev Dabas 4 years, 6 months ago

Pascal

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Jyoti Raghav 4 years, 6 months ago

Pascal

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What do you mean by crops

Posted by Pratikcha Rai 4 years, 6 months ago

CBSE > Class 08 > Science

5 answers

Harsheen Khurana 4 years, 6 months ago

The same kind of plant grown and cultivated on a large scale is known as crop

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Prashil Patel 4 years, 6 months ago

crop which grow in a large scale for example cereal, fruit, or vegitable

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Kavya Arora 4 years, 6 months ago

A cultivated plant that is grown on a large scale commercially, especially a cereal, fruit, or vegetable.

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Neil Mesariya 4 years, 6 months ago

A cultivated plant that is grown on a large scale commercially, especially a cereal, fruit, or vegetable.

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Deshmukh Sayid Rashidmiya Deshmukh Sayid 4 years, 6 months ago

Plant

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What is the reaction of ferrous sulphate with oxygen?

Posted by Prishaa Verma 4 years, 6 months ago

CBSE > Class 08 > Science

1 answers

Shivam Mahaseth 4 years, 6 months ago

Iron(II) sulfate or ferrous sulfate denotes a range of salts with the formula FeSO₄·xH₂O. These compounds exist most commonly as the heptahydrate but are known for several values of x. The hydrated form is used medically to treat iron deficiency, and also for industrial applications.

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Important question of 2021 syllabus

Posted by Hardik Srivastava 4 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Pragya Bharti 4 years, 6 months ago

In our school Chapter 9,10,13,14,15,16,17&18 are coming so the important questions from these chapters are,Actually all the questions are very important but some questions which are very very Important they are: Q1.)Explain Reproduction.Why it is important? Q2.)What are the two modes of reproduction? Q3.)Define metamorphosis.Give example. Q4.)Different between Sexual and Asexual Reproduction? Q5.)Define Adolescence. When it begins? Q6.)What are the changes that place during puberty ? Q7.)Different between noise and music. Can music become noise. Q8.)What is electroplating? Q9.)Define electroscope. Q10.)Define Earthing. Q11.)How will you protect your self against earthquake: i.)If you are at home ii.)If you are outdoors Q12.)Define Incident and reflected ray. Q13.)Define regular and irregular reflection. Q14.)Define constellation. Q15.)What is meteors?

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Harsheen Khurana 4 years, 6 months ago

What are *** hormones? Why are they named so? Write their functions.

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Which planet is closest to the sun

Posted by Sahili Thul 4 years, 6 months ago

CBSE > Class 08 > Science

5 answers

Jiah Jinan? 4 years, 6 months ago

Mercury

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Tamanna Bagal 4 years, 6 months ago

Mercury

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Khushi Gupta 4 years, 6 months ago

Mercury

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Shivam Mahaseth 4 years, 6 months ago

Murcury

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Hardik Srivastava 4 years, 6 months ago

Mercury

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How and where does fertilisation take place in human beings?

Posted by Keval Chorada 4 years, 6 months ago

CBSE > Class 08 > Science

0 answers

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Name the two types of name cell prevent in retina write

Posted by Rukaiya Majid 4 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Shubham Pingale 4 years, 6 months ago

Cones and rods

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Rukaiya Majid 4 years, 6 months ago

The primary light-sensing cells in theretina are the photoreceptor cells, which are of two types: rods and cones. Rods function mainly in dim light and provide black-and-white vision.

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How is chemical effect used for decomposition of compounds ? Give an example

Posted by Ravi Singh 4 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Shivam Mahaseth 4 years, 6 months ago

First we have to take two metals plate which would be one on which you have to deposit and 2nd from which metal you have to transfer then connect 1st matel plate on negative terminal and 2nd to possitive terminal then the metal plate on positive terminal would get transfer to the plate on nagetive terminal Eg:- take two metals one is copper and 2nd would be a rusted copper and take the copper sulphate solution and then connect a copper plate on nagetive terminal and connect the rusted copper plate on positive terminal and it would get started decomposition.

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Rukaiya Majid 4 years, 6 months ago

In the breakdown of acompound into its constituent parts, the generalized reaction forchemical decompositionis: AB → A + B. An example is the electrolysis of water to the gases hydrogen and oxygen: 2 H2O(l) → 2 H2(g) + O2(g)

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How will you detect the weak currents through liquid

Posted by Ravi Singh 4 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Shivam Mahaseth 4 years, 6 months ago

By using low woltage bulbs that is led light emitting diode

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Soumya Rãñjãñ Khuntia 4 years, 6 months ago

Through led or by compass

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How do you detect whether the liquids conduct electricity or not

Posted by Ravi Singh 4 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Baby Singh 4 years, 6 months ago

By tester

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Khushi Gupta 4 years, 6 months ago

By the tester

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Soumya Rãñjãñ Khuntia 4 years, 6 months ago

By the tester

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What is the need of electroplating

Posted by Ashutosh Mishra 4 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Ashutosh Mishra 4 years, 6 months ago

Thanks to both of you

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Shivam Mahaseth 4 years, 6 months ago

Electroplating perform main role in decomposition of a desired metal to another metal like chromium is very expensive matel and we cant make any substance with chromium because it is so expensive but we can plate it on any metal which is not expensive

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Soumya Rãñjãñ Khuntia 4 years, 6 months ago

Need of electroplating is to give a coating of an desired metal to another metal for some properties which the metal lacks

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List out the characteristics of plane mirror

Posted by Bhoomika Ananya Prudhivi 4 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Shivam Mahaseth 4 years, 6 months ago

1 it forms erect image 2 it shows lateral inversion 3 and forms the image at the same distance 4 forms same size of image of an object 5 and forms real image

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Hardik Srivastava 4 years, 6 months ago

It's surface is smooth It from real image

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Baidehi Mangal 4 years, 6 months ago

1. It is smooth 2. It forms real images 3. It shows lateral inversion

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What is a smog!?

Posted by Amar Kumar Ix Ä 4 years, 6 months ago

CBSE > Class 08 > Science

3 answers

Khushi Gupta 4 years, 6 months ago

Smog is the mixture of smoke and fog It is usually be seen in winters. It also causes many breathing problems.

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Baidehi Mangal 4 years, 6 months ago

Smog is the mixture of smoke and fog It is usually be seen in winters. It also causes many breathing problems

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Bhoomika Ananya Prudhivi 4 years, 6 months ago

Smog is a mixture of smoke and fog.

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can you store lemon pickle in an aluminium utensil? explain

Posted by Nikesh Singh 4 years, 6 months ago

CBSE > Class 08 > Science

5 answers

Baby Singh 4 years, 6 months ago

No, because lemon is acid and aluminum is metal. We know that acid reacts with metal to give hydrogen

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Khushi Gupta 4 years, 6 months ago

No, because lemon have a acid and acid react with metal very soon as well as quickly.

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Shivam Mahaseth 4 years, 6 months ago

No we can't store lemon pickle in aluminium utensils because acids react with metals and lemon pickle contains acid and Aluminium is metal

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Bhoomika Ananya Prudhivi 4 years, 6 months ago

No, because lemon contains acid which reacts and corrodes the aluminium metal making it spoilt.

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Amar Kumar Ix Ä 4 years, 6 months ago

I think no because it get spoiled

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What is adolescence in 1 or 2 sentences

Posted by Jiah Jinan? 4 years, 6 months ago

CBSE > Class 08 > Science

5 answers

Khushi Gupta 4 years, 6 months ago

Adolescence is the period of life when our body undergoes changes due to reproductive maturity

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Rukaiya Majid 4 years, 6 months ago

1 : the period of life when a child develops into an adult : the period frompuberty to maturity terminating legally at the age of majority (see majority sense 2a) He struggled through hisadolescence. 2 : the state or process of growing up. 3 : a stage of development (as of a language or culture) prior to maturity.

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Soumya Rãñjãñ Khuntia 4 years, 6 months ago

Adolescence is the period of life when our body undergoes changes due to reproductive maturity

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Purva Ghule 4 years, 6 months ago

Adolescence is the period of life when our body undergoes changes and reproductive maturity

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Shruti ? 4 years, 6 months ago

The period of life when the body undergoes changes leading to reproductive maturity is known as adolescence

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