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

Ask questions which are clear, concise and easy to understand.

Ask Question

What is drip irrigation??

Posted by Sarika Yadav 6 years, 9 months ago

CBSE > Class 08 > Science

4 answers

K Raja 6 years, 9 months ago

Drip system posses the water drop by drop near the roots. In this techniqe the water is not wasted

0Thank You

Ritika Ritu 6 years, 9 months ago

Watering the plant near the roots are known as drip irrigation.It is used in places were water availability is less.

0Thank You

Divya Dharshini 6 years, 9 months ago

it is a type of irrigation that drops water near the roots directly it is boon in region were availability of water is poor

0Thank You

Yogita Ingle 6 years, 9 months ago

In Meghalaya, a 200 year old system of tapping stream and spring water by using bamboo pipes,
is prevalent.

Bamboo pipes are used to divert perennial springs on the hilltops to the lower reaches by gravity.
The channel sections made of bamboo, divert water to the plant site, where it is distributed into branches.
If the pipes pass roads, they are taken high above the land on the free branches.
Reduced channel sections and diversion units are used at the last stage of water application. The last channel section enables water to be dropped near the roots of the plant.

0Thank You

ANSWER

Is hydra reproduction..... Is asexual or sexual........ Or is this type of budding

Posted by Smith Zade Zade 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Ritika Ritu 6 years, 9 months ago

Asexual reproduction because it takes budding type

1Thank You

Himanshi Singh 6 years, 9 months ago

It reproduces through budding which is asexual type of reproduction.

2Thank You

ANSWER

Chemicals properties of metals and non metals

Posted by Dev Bhati 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Hemanshu Kumar 6 years, 9 months ago

Metals 1. It react with oxygen to produce metallic oxide 2. It react with water to produce metal hydroxide and hydrogen gas 3. It also react with dilute acids to produce salt + hydrogen gas For example: zn + HCL= zncl2 + H2(gas) 4. It is basic in nature so it does not react with base Non metal 1. It react with oxygen to produce non metallic oxide 2. It does not react with water 3. It does not react with acid because it is acidic in nature 4.reaction of non metals with base are very complex

1Thank You

ANSWER

How do we jear sound

Posted by Anshika Shukla 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Smith Zade Zade 6 years, 9 months ago

In human......--= Through larynx or vocal cords And our normal life...... Sounds is produced by..... Vibrating objects..... I hope you understand what I tell you

0Thank You

ANSWER

What is constalation?name any 2constution

Posted by Babu Gandhi 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Hemanshu Kumar 6 years, 9 months ago

Constellation is group of star that appear to form recognisable shape For example: Ursa Major and Orion

0Thank You

Smith Zade Zade 6 years, 9 months ago

Constellation is group of stars..... Constellation =oroin.... Caspodia

0Thank You

ANSWER

Keywords

Posted by Ashraf Sir 6 years, 9 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Brifely explain vaccine

Posted by Hemanshu Kumar 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Anushka . 6 years, 9 months ago

The medicine which kill or stop the growth Of disease causing microorganism is known as vaccine ..............

0Thank You

ANSWER

Differentiate between comets and meteors

Posted by Abhishree Gupta 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

Comets are dirty space snowballs of mostly ice and dust that formed during the birth of the solar system 4.6 billion years ago. However, . When meteoroids collide with a planet's atmosphere, they become meteors. If those meteors survive the atmosphere and hit the planet's surface, their remains are called meteorites.

1Thank You

ANSWER

What is the biggest planet

Posted by Anusunuri Rajaveeru 6 years, 9 months ago

CBSE > Class 08 > Science

4 answers

Dev Bhati 6 years, 9 months ago

Jupiter

0Thank You

Babu Gandhi 6 years, 9 months ago

Jupiter

0Thank You

Dev Sethi 6 years, 9 months ago

Jupiter

0Thank You

Nikki Poojar 6 years, 9 months ago

Jupitar is the largest planet

0Thank You

ANSWER

The force of friction is always

Posted by Rishi Raj Sharma 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Hemanshu Kumar 6 years, 9 months ago

Opposite direction

0Thank You

Richa Shree 6 years, 9 months ago

In the opposite direction of the force applied

2Thank You

ANSWER

Difference between magnetic and electrostatic force

Posted by La_Me Opsie? 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Richa Shree 6 years, 9 months ago

Magnetic force uses the property of magnet for applying force on any object. In this the magnets attract the mettalic objects towards themselves. Electrostatic force is applied on a charged to charged or uncharged to charged body. Different charges attract each other and like charges repel each other.

0Thank You

ANSWER

What is motation

Posted by Abhishek Maurya 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Jasmitha Do Your Best 6 years, 9 months ago

Motation or motion

0Thank You

ANSWER

What is manetic force

Posted by Shashikant Shinde 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Jag Tar 6 years, 9 months ago

The force applied by magnet is called magnetic force

0Thank You

Pooja K 6 years, 9 months ago

The force exerted by magnets

0Thank You

ANSWER

The process of conversion of sugar into alcohol is called ?

Posted by Harsh Yadav 6 years, 9 months ago

CBSE > Class 08 > Science

4 answers

Dev Sethi 6 years, 9 months ago

Fermentation

0Thank You

Samruddhi Br 6 years, 9 months ago

Fermentation

1Thank You

Tejasvi Gaikwad 6 years, 9 months ago

Sorry it is fermentation

1Thank You

Tejasvi Gaikwad 6 years, 9 months ago

Fragmentation

1Thank You

ANSWER

Explain why we always see the same side of the moon....??

Posted by Upasna Gautam 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Yuvi Grover 6 years, 9 months ago

Because moon takes the same time for its rotation on its axis and revolution on its orbit that's why we can see only one side of moon.

1Thank You

ANSWER

What is vaccin ?

Posted by Devanshi Vaishya 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Hemanshu Kumar 6 years, 9 months ago

Vaccine is a preparation of containing dead microbes that are introduced to healthy body and fights and kill invaded bacteria by producing specific antibodies

0Thank You

Pooja K 6 years, 9 months ago

An antibiotic

1Thank You

ANSWER

All very short answer

Posted by Harshit Jain 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Krati And Kushagra Nigam 6 years, 9 months ago

All subject

1Thank You

Saloni Pant 6 years, 9 months ago

For what??

0Thank You

ANSWER

Where can we find Amoeba in our life

Posted by Asish Potturi 6 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Pooja K 6 years, 9 months ago

In soil ,in air also

0Thank You

Upasna Gautam 6 years, 9 months ago

Near to pond ......

0Thank You

Yash Borkar 6 years, 9 months ago

Pond

1Thank You

ANSWER

what is e=mc2

Posted by Deepak Parajuli 6 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Yash Borkar 6 years, 9 months ago

Energy =mass into speed of light square

2Thank You

Yash Borkar 6 years, 9 months ago

Eienstine =mc2

0Thank You

Asish Potturi 6 years, 9 months ago

energy =mass×speed of light square

3Thank You

ANSWER

Two objects repel each other. This repulsion is due to what force

Posted by La_Me Opsie? 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Yuvi Grover 6 years, 9 months ago

Its electric force. Which is the force of attraction and repulsion.

0Thank You

Deepak Parajuli 6 years, 9 months ago

magnetic force

1Thank You

ANSWER

Explain the internal structure of human eye and also explain the functions of various parts of the eye

Posted by Nikki Poojar 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Prisha Gupta 6 years, 9 months ago

The internal parts of an eye are: Retina - Image formation takes place here Cornea- Its a tough white structure which protect the inner parts of an eye Iris - This substance gives eye a colour Pupil - It is a small opening . It controls the amount of light entering our eye .It is controlled by the iris. Lens- These are thick in the centre

4Thank You

ANSWER

Name two gases which are mainly responsible for acid rain

Posted by Mahima Vats 6 years, 9 months ago

CBSE > Class 08 > Science

5 answers

Dev Sethi 6 years, 9 months ago

Sulphur dioxide and nitogen dioxide reacts with water vapours and form of sulphuric acid and nitric acid.These acids drop down with rain water are called acid rain

0Thank You

Upasna Gautam 6 years, 9 months ago

The sulphur oxide and nitrogen oxide aren't mainly responsible for acid rain

0Thank You

Kashish Goyal 6 years, 9 months ago

When oxides of nitrogen and sulphur mixes with each other they form acid rain

0Thank You

Kanvi ..?? 6 years, 9 months ago

When air pollutants such as oxides of sulphur and nitrogen react with oxygen and water vapoir of the atmosphere,they eventually form dilute solutions of sulphuric acid and nitric acid.

2Thank You

Amit Kathuria 6 years, 9 months ago

Sulphur dioxide , oxides of nitrogen

0Thank You

ANSWER

Define Adolscence

Posted by Tara Bhansali 6 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Upasna Gautam 6 years, 9 months ago

Adolscence is the period of life.. which many changes take place in the body. Leading to reproductive maturity.. adolsence begins to around 10 years of age.... and lasts till 18 or 19 year of age..... ??

3Thank You

Kanvi ..?? 6 years, 9 months ago

The period of transition from childhood to adulthood is called adolescence

1Thank You

@ Mvn 6 years, 9 months ago

The period of life , when the body undergoes changes, leading to reproductive maturity , is called adolesence . (It os on page no . 113 of textbook)

2Thank You

ANSWER

What is constillation ?

Posted by Devi Patel Patel 6 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Upasna Gautam 6 years, 9 months ago

A group of stars that appears to form a pattern in the sky.... called constillation

1Thank You

@ Mvn 6 years, 9 months ago

The stars forming a group that has a recongnisable shape is constellation. ( It is on page no 221 of textbook.)

0Thank You

Devi Patel Patel 6 years, 9 months ago

The groups of stars in pattern or in a shap is called constillation

1Thank You

ANSWER

What is air pollution? Write it's causes & how can you reduce them

Posted by Satya Singh Rajput 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Pranav Pandey 6 years, 9 months ago

Unwanted gases in air called air pollution.it causes is headache,asthma,wheezing in children.we reduce air pollution by grow more trees and plants,take part in van mohatsav activity,use public transport,etc

1Thank You

@ Mvn 6 years, 9 months ago

# When air is contaminated by unwanted substances which have harmful effect on both living and non living , it is referred to as an air pollution. # It is caused by 1. Due to increase in smoke and dust, because of some human activities. 2. Increase of chlorofluorocarbon (CFC), because it is realsed from refrigerator and air conditioners and it is very harmful for our atmoshpere. 3. Vehicles produce high level of pollutants like carbon monoxide, nitrogen oxide and smoke which effect our atmoshpere by causing pollution. # 1. we should use public transport. 2. We should use fossil fuels for energy.requirements this could be solar energy, hydropower and wind energy. To reduce pollution. We should plants tree and stop cutting them..

0Thank You

ANSWER

A man stands 10m in front of a large plane mirror. How far must he walk to be 5m away from his image?

Posted by Prisha Gupta 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Neeharika Akaram 6 years, 9 months ago

2Thank You

ANSWER

Whats is amplitude

Posted by Lakshya Maithil 6 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Hemanshu Kumar 6 years, 9 months ago

Maximum displacement of a vibration particle from it mean position

0Thank You

Kanvi ..?? 6 years, 9 months ago

The maximum displacement from the mean position during an oscillation is called the amplitude of the oscillation.

0Thank You

Prisha Gupta 6 years, 9 months ago

Max. Displacement of a vibrating obj.

1Thank You

ANSWER

What is the vibrating part of harmonium???

Posted by Raeesa Parveen 6 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Raeesa Parveen 6 years, 9 months ago

Harmonium don't have strings the due to the air columns it produces sound similarly in flute

0Thank You

Saloni Pant 6 years, 9 months ago

Its strings

0Thank You

Abhishek Kumar 6 years, 9 months ago

String

0Thank You

ANSWER

What is coke???

Posted by Seema Kaliya 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 9 months ago

Coke

It is a porous and black colored substance.
It is a pure form of carbon.
It is used in the extraction of metals. And also used in the manfacture of steel.

3Thank You

ANSWER

Explain why chloroplast are found only in plant cell

Posted by Swati Burnwal 6 years, 9 months ago

CBSE > Class 08 > Science