CBSE > Class 10 > Science | CBSE Board | Homework Help

DNA copying is important for reproduction. Additional copies of DNA are made during replication which is necessary for the new cells formed after cell division. DNA replication is responsible for bringing variations.

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How can Mendel's experiment be clearly kept in mind without any confusion...

Posted by Amandeep Kaur 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Deepak Silaych 6 years, 1 month ago

By revision

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How to remember modern periodic table very nicely...

Posted by Amandeep Kaur 6 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Arpita Sondhi 6 years, 1 month ago

There is this one song on youtube that helped me learn the first 20 elements :D Hope it helps!

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Aman Saxena 6 years, 1 month ago

You don't need to remember full periodic table only 1 to 20 elements are important. From from 1 to 20 elements learn atomic radii valency etc.

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Varsha Katambe 6 years, 1 month ago

Do nt learn it

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Deepak Silaych 6 years, 1 month ago

In CBSE ANNUAL EXAM no one is going to ask to draw periodical table. Just learn how to find groups and periods of given electronic configuration!

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Ankit Kumar 6 years, 1 month ago

Go in YouTube

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Which metal has highest melting point ?

Posted by Anil Sastiya 6 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Varsha Katambe 6 years, 1 month ago

Platnium also

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Yogita Ingle 6 years, 1 month ago

Tungsten has the highest melting point which is equal to 3422 degree Celsius .

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Aman Patidar 6 years, 1 month ago

Tungsten

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Which displacement reaction occur when zincoxide react with zinc

Posted by Jyoti Lamba 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Deepak Silaych 6 years, 1 month ago

No reaction!

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What are allotropes

Posted by Anita Mhaske 6 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Grahul 📒🎒📓📔🙇🙇🙇 Rahul 6 years, 1 month ago

The same substance one element with the same molecular formula occur in three or more forms. The allotropes of carbon are graphite diamond and buck minister fullorene

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Deepak Silaych 6 years, 1 month ago

Single element can exist in many different pysical form. These form are called Allotropes of that element. Eg: in our syllabus there are allotropes of carbon that are - carbon , diamond, graphite, C60.

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An element P does not react with dil. Sulphuric acid. It forms an oxide PO which turns red litmus into blue. Will you call P as a metal or a non metal? Give reason

Posted by Anil Kumar 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Deepak Silaych 6 years, 1 month ago

1. PO is base ,so P is base/amphoteric oxide. 2. It don't react with Sulphuric Acid. Hence amphotric metal react with H2SO4. Therefore P is base

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How it is important to solve sample paper ??

Posted by ?? 6 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Teen Learner 6 years, 1 month ago

Yes

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Deepak Silaych 6 years, 1 month ago

1. It help you to understand the question payter and time use. 2.Some questions in annual exam can come from these sample paper, hence you done those questions earlier you can successfully attend those questions. CONCLUSION :- thus it is very important to solve sample paper to score better marks.

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What is the principal of generator ??

Posted by ?? 6 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Santosh Kumar Gaur 6 years, 1 month ago

When a current carrying coil is placed then while rotating magnetic flux changes due to which emf is induced in the coil and if the circuit is closed current Starr's flowing

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Aman Patidar 6 years, 1 month ago

Electromagnetic induction

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Jyoti Kumari 6 years, 1 month ago

Electromagnetic induction

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Chor 420 6 years, 1 month ago

Electromagnetic induction

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Yashank Kumar 6 years, 1 month ago

It convert electrical energy to mechanical energy

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What is Sutructure of human eye

Posted by Nirmal Sidhu 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 1 month ago

The human eye is a spherical structure which fits in the eye socket in the skull bone. There are following main parts in the human eye.

Pupil: Pupil is the round black spot in front of eye. It regulates the amount of light entering the eyes. Pupil works like aperture of a camera. In case of dim light pupil dilate to allow more light to enter the eyes. In case of strong light pupil constrict allowing less light to enter.

Irish: Irish is made of muscles. They control the size of opening of pupil.

Lens: Lens lies just behind the pupil. Lens becomes thin to increase its focal length. This enables us to see distant objects clearly. To focus on nearer objects, lens becomes thick to decrease its focal length. But there is a limit. The minimum distance of clear vision is 25 cm. Below this distance, we cannot see things clearly.

Retina: Retina works like a screen or camera film. Retina is full of light and colour sensitive cells. These cells, upon receiving image send electrical signals to the brain, which processes these information to make a mental image of what we see. The photoreceptor cells in the eye are of two types, viz. rod cells and cone cells. The rod cells are sensitive to dim light. The cone cells are sensitive to bright light and colour.

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anyone on

Posted by Your Father 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Beauty... ??? 6 years, 1 month ago

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Menopause

Posted by Deepak Sharma 6 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Chor 420 6 years, 1 month ago

Menopause is the last appearance of maturation

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Aadya Singh 6 years, 1 month ago

The time in women's life in which menstrual cycle ends..

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does base conduct electricity

Posted by Shreyas V 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Madhu Gupta 6 years, 1 month ago

Yes because base is electrolyse

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What. Is. CKD

Posted by Suraj Kumar 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 1 month ago

Chronic kidney disease (CKD) refers to all five stages of kidney damage, from very mild damage in stage 1 to complete kidney failure in stage 5.

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Explain the phenomenon of regeneration with the help of a diagram. How is regeneration different from reproduction?

Posted by Shadab Alam 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 1 month ago

i) Regeneration is a type of asexual propagation of an organism.

ii) In this phenomenon, if a part of the organism is cut out from its body, then that part and the remaining body of the organism is able to grow into 2 new whole organisms.

iii) For example, Planaria is a type of organism that is capable of regeneration. When a planaria is cut into pieces, each piece is able to regenerate and grow into a complete new organism.

Difference between regeneration and reproduction.

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Will questions from Lab Manual come in science??

Posted by Anshika Prakash 6 years, 1 month ago

CBSE > Class 10 > Science

10 answers

Tekan Dewangan 6 years, 1 month ago

No, not at all , in 2020 board exams only 1 mark, 3 marks, and 5marks question will come in which practical based questions will not come.

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???Akhil Singh Sengar ??? 6 years, 1 month ago

Tum sab mein tatara vamiro kon hai

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???Akhil Singh Sengar ??? 6 years, 1 month ago

Maybe possible,

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???Akhil Singh Sengar ??? 6 years, 1 month ago

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Shraddha ☺️☺️ 6 years, 1 month ago

Yes it will surely come, in last year's paper there is a separate sectionE for practical based question only.You can even check it.

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♛ ❝Ѕυнαɴα❞ ♛ 6 years, 1 month ago

Yes!

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Anuj Kumar 6 years, 1 month ago

Yes but some question are helpful in board exam

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Shruti Gupta 6 years, 1 month ago

Yes it will. Practical based questions are definitely going to come.

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Vatsal Sejpal 6 years, 1 month ago

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Teen Learner 6 years, 1 month ago

Yes may..

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A student name sahil was sitting in his room suddenly he smell of something burning .was this is reflex action or not and was this involuntry or voluntry

Posted by Ritikbhai Ki Jai 6 years, 1 month ago

CBSE > Class 10 > Science

15 answers

???Akhil Singh Sengar ??? 6 years, 1 month ago

Board mein kitne percentage ka criteria set kiya hai. Me 88

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Anuj Kumar 6 years, 1 month ago

I think that it is involuntary action because we can not command or control it

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Teen Learner 6 years, 1 month ago

Ohk sorry

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Diksha? 6 years, 1 month ago

Durse k Q m baat mt kro,sabko acha ni lgta?

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Teen Learner 6 years, 1 month ago

Merko lgta hai kabhi kabhi mai paglo jesi baate krta hu sorry??

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Diksha? 6 years, 1 month ago

Ryt?

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Teen Learner 6 years, 1 month ago

Yrr ek mn mai aata hai jldi boards jay taki hum free ho but dusra dimaag mai aata hai boards k liye kuch ni aata?

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Teen Learner 6 years, 1 month ago

Arre bss itna hi?

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Teen Learner 6 years, 1 month ago

Yrr dimaag hi kharaab hone lagta hai pura

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Diksha? 6 years, 1 month ago

11 20 tk chala paungi?

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Diksha? 6 years, 1 month ago

Same here

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Teen Learner 6 years, 1 month ago

Badi mushkil se phn hath laga?

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Teen Learner 6 years, 1 month ago

Hi diku

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Diksha? 6 years, 1 month ago

I do think?

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Shreya S❤ 6 years, 1 month ago

Voluntry I think

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What is the process of dilution of acid called

Posted by Akshay Gupta 6 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Teen Learner 6 years, 1 month ago

Dilution

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Santosh Kumar Gaur 6 years, 1 month ago

Concentrated acid

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Anuj Kumar 6 years, 1 month ago

Dilution

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Mayank Gupta 6 years, 1 month ago

Diluted acid

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Diksha? 6 years, 1 month ago

Acid is slowly added to water by stirring continuously

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Can experiments are asked in board? like,to show sunlight /CO2/chlorophyll is essential for photosynthesis

Posted by Saksham Verma 6 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Teen Learner 6 years, 1 month ago

Yes

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Anuj Kumar 6 years, 1 month ago

Yes

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Shruti Gupta 6 years, 1 month ago

Yes it will be asked but internal choice can also be provided

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Diksha? 6 years, 1 month ago

Yes

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Akshay Gupta 6 years, 1 month ago

Nooo

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2 examples of sexually transmitted diseases and 2 examples of bacterial infections.?

Posted by Aman Saxena 6 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Saksham Verma 6 years, 1 month ago

*warts

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Saksham Verma 6 years, 1 month ago

Sexually transmitted disease :AIDS and warys Bacterial infections :gonorrhea and syphilis

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What happen when the body size of the organism increase the body design becomes more complex

Posted by Neha Patel 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Santosh Kumar Gaur 6 years, 1 month ago

Fragmentation takes place

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Write Joules law of heating

Posted by ? Marshmallow Ashu? 6 years, 1 month ago

CBSE > Class 10 > Science

6 answers

Teen Learner 6 years, 1 month ago

H=I²Rt or H = V²/R ×t

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Anuj Kumar 6 years, 1 month ago

V^2/r

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Anuj Kumar 6 years, 1 month ago

Vit

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Mayank Gupta 6 years, 1 month ago

When a current is flown though a high resistance conductor then, it is totally convert into heat.This is known as joules low of heating. I Hope it will help you.

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Diksha? 6 years, 1 month ago

H=I^2Rt

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Basker A 6 years, 1 month ago

when an electric current is passedThrough a high resistance wire like me chrome wire the resistance wire becomes very hot and produces heat this is called heating effect of electric current or Jules law of heating

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Displacement reaction. AlCl3 + NH4OH —> ????

Posted by Aman Saxena 6 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Anshika Prakash 6 years, 1 month ago

AlCl3+ NH4OH ----> NH4Cl + Al(OH)3

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About human eye

Posted by Dipshi Rajput 6 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Grahul 📒🎒📓📔🙇🙇🙇 Rahul 6 years, 1 month ago

The human wye contains three parts such as Cornea,Iris and Pupil

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Meghna Thapar 6 years, 1 month ago

The various parts of the human eye and their respective functions include:

Cornea – It helps the light to enter the eyes coming through various objects.
Iris – It controls the amount of light entering in to the eyes.
Pupil – It is a hole in middle of iris which adjusts its opening to allow the required amount of light for clearing purpose.
Ciliary muscles- The focal length of the eyes is changed by the action of ciliary muscles. The ciliary muscles can change the thickness of the soft and flexible eyes lens and hence the focal length which, in turn, changes the converging power of the eyes.
Eye-lens – It forms the real image of the object on the retina.
Retina – It is a screen on which the image is formed.
Optic nerve – These nerves transfers the formed image to the brain.

Working of the eye:-The light coming from the object kept in front of us enter through the cornea of the eyes, pass through the pupil of the eyes and fall on the eye lens. The eyes lens is convex lens, so it converge the light rays and produces a real and inverted image of the object on the retina. The image formed on the retina is conveyed to the brain by the optic nerve and gives rise to the sensation of vision.

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which substance constitutes the enamel coating of our teeth

Posted by Simmi Yadav 6 years, 1 month ago

CBSE > Class 10 > Science