CBSE > Class 07 > Science | CBSE Board | Homework Help

We know that across the world on 22nd March World Water Day is celebrated. In 1993, United Nations General Assembly decided to celebrate this day as an annual event to increase the awareness among the people about the need and conservation of water.

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Why only on 22 March is celebrated as the World Water Day ?

Posted by Sanika Patil 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

On 22 March is celebrated as the world water day to attract the attention of everybody towards the importance of conserving water. On the World Water Day, on 22 March 2005, the General Assembly of the United Nations proclaimed the period 2005–2015 as the International Decade for action on “Water for life”.

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Briefly explain white light is composed of seven colour

Posted by Priyanshu Mishra 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Diksha Sharma 7 years, 1 month ago

The white light is composed of seven different colors namely violet, indigo, blue,green,yellow,orange and red. The reflecting of light into seven colors is known as dispersion.

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Sun is the ultimate energy source for all food chain. But from where will animals live deep down on the ocean bed have never seen sunlight get energy

Posted by Sameer Raj 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Shivam Aresay 5 years, 11 months ago

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Why we are wasting a lots of water ?

Posted by Shashank Mishra 7 years, 1 month ago

CBSE > Class 07 > Science

0 answers

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Cyclone difinination

Posted by Naman Yadav 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Nikhil Gupta 7 years, 1 month ago

The chain of events ends with the formation of a very low pressure system with very high speeds winds revolving around it. It is called CYCLONE.

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Niyati Niyati 7 years, 1 month ago

Strong circulatory winds in tropical region.

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What is decomposers

Posted by Kumaran Sopanam 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Shashank Mishra 7 years, 1 month ago

The organism that break down the dead dacanic matter is called decomposer.

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Kartikeya Khatri 7 years, 1 month ago

The micro-organisms convert dead plant and animal to humus is called decomposers

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What are valli?

Posted by Gopal Yogi 7 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Dharmendra Kushwaha 7 years, 1 month ago

The inner linnig of the small intestine has million of the finger like out growth called villi. The function of the villi in the small intestine is to increases the area for the rapid absorption of the food.

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Sh ~?Shrawni 7 years, 1 month ago

The figure like projection in the inner wall of small intestine

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Jai Uppal 7 years, 1 month ago

The inner walls of small intestine have thousands of finger - like outgrowths . These are called villi.

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Shashank Mishra 7 years, 1 month ago

The finger like projection in the inner walls of small intestine is called villi

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Differences between real and virtual image.

Posted by Aryan Verma 7 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Avanty Kumari 7 years, 1 month ago

Image that we can see on a screen is called a real image . Image that obtain inside or under a plane surface is called virtual image.

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Jai Uppal 7 years, 1 month ago

Real image :- the image obtain on screen is called real image . Virtual image :- the image cannot be obtained on screen is called virtual image . Example :- In the case of plane mirror virtual image are formed

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Shashank Mishra 7 years, 1 month ago

:-)The image that we can obtained on screen is called real image. :-)The image that we can not obtained on screen is called virtual image.

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Kumaran Sopanam 7 years, 1 month ago

Image that formed on a screen is known as real image.Image that not formed on a screen is known as virtual image

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Name the largest artery in the body?

Posted by Birendra Mahto 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Sh ~?Shrawni 7 years, 1 month ago

Aorta

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Yogita Ingle 7 years, 1 month ago

The largest artery in human body is aorta. It is located at the left ventricle of our heart. All the output of blood from the left side of the heart goes into the aorta

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What is zygote??

Posted by Rehnuma Sapa 7 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

What is aquifer?

Posted by Sujal Jain 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Paluri Nikhil 7 years, 1 month ago

The groundwater is stored between layers of hard rocks below the water table is called aquifer

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What is water table?

Posted by Sujal Jain 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Aditya Avinash 7 years, 1 month ago

The top most layer of water in ground

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Niyati Niyati 7 years, 1 month ago

The level of groundwater.

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What do you mean by heartbeat

Posted by Ashok Sinha 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Sh ~?Shrawni 7 years, 1 month ago

Continue movement of heart is called heartbeat

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Yogita Ingle 7 years, 1 month ago

When the heart is busy with pumping blood, the different chambers of the heart open and close, or contract and relax. Each time the chambers contract or relax, a thumping sound is produced. This is what is known as the heartbeat.

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Aanya Sethi 7 years, 1 month ago

The continous movement of the heart with the help of which blood is send to all aother parts of tge body

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Herbs are found in the ___-layer of the forest

Posted by Supriya Kumari 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Lionel Messi⚽⚽???? 7 years, 1 month ago

forest floor

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Niyati Niyati 7 years, 1 month ago

Lowest

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Name layer of soil which holds water

Posted by Ashish Dubey 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

A horizon: Top layer of soil is called A-horizon. It is also called top-soil. A-horizon is generally dark in colour. It is rich in humus. A horizon is generally soft and porous. It retains more water.

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How to reproduce in humans

Posted by Aditya Kumar 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Aditya Kumar 7 years ago

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Lionel Messi⚽⚽???? 7 years, 1 month ago

what does sexually mean

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Niyati Niyati 7 years, 1 month ago

Sexually

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How to make convex mirror

Posted by Ayan Jamshed 7 years, 1 month ago

CBSE > Class 07 > Science

0 answers

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The process which ensures continuity of life on earth is called

Posted by Anna Mariya Anna Mariya 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Dharmendra Kushwaha 7 years, 1 month ago

Reproduction

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Poonam Dwivedi 7 years, 1 month ago

Reproduction

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Anna Mariya Anna Mariya 7 years, 1 month ago

What

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What is a physical change

Posted by Syed Saliq 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Dharmendra Kushwaha 7 years, 1 month ago

Those changes which can can be reversible,means after occuring it will returns in their acctual form is called physical change. For example melting of ice.

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Sujal Jain 7 years, 1 month ago

Phyical change is a change in which no new substance is formed. Change takes place in the phyical properties such as shape,size,colour or in state.

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Adithi Deepak 7 years, 1 month ago

Physical change is a change which occurs in the physical properties. such as-size,shape,state and colour.

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Difference between speedometer and odometer

Posted by Tanvi Subramanian 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Dharmendra Kushwaha 7 years, 1 month ago

Speepdometer is a device which is use to measure the speed of the vehicle while the odometer is a device which is use to measure the total distance covered by the vehicle.

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Adithi Deepak 7 years, 1 month ago

Speedometer shows the speed travelled by a vehicle. Odometer shows the total distance travelled by a vehicle. Hope this answer helped you....

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What is arator

Posted by Aditya Narayan Singh 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Ritesh Bihari 7 years, 1 month ago

It a thing which is used to generate bubbles in water

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What is the function of sweat?

Posted by Sujal Jain 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Dharmendra Kushwaha 7 years, 1 month ago

The function of the sweat in our body is to remove the waste like salt and help to maintain the temperature of our body

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Ayesha Khatua 7 years, 1 month ago

Trough sweat the amount of salt ,waste removed from our body.

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Niyati Niyati 7 years, 1 month ago

It cools the body..and wastes are also removed like salt, water...

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List zx some home house keeping practices to minimise or eliminase waste at thier source

Posted by Pranjal Dhumale 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Better Housekeeping Practices:

There are various ways to minimise or eliminate waste and pollutants at their source. Some of them are:

Used oils and fats should not be poured into the sink which may choke the pipes. We should always throw oils and fats in the dustbin as in open drain the fats clog the soil pores and the filtration of water.
Many household chemicals like paints, motor oil, insecticides, etc. should not be allowed to go down as these are very toxic and harmful to both humans and microbes.
Used tealeaves, solid food remains, soft toys, cotton, sanitary towels, etc. should also be thrown in the dustbin which may choke the drains as it do not allow the free flow of oxygen and thus hamper the degradation process by microorganisms.

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Do you know why eucalyptus trees can grow all along the sewage?

Posted by ?Sayeda Faria Ainee? 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

?Sayeda Faria Ainee? 7 years, 1 month ago

Thanks for answering my question

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Yogita Ingle 7 years, 1 month ago

Eucalyptus trees are grown near sewage ponds as they can grow in contaminated soils and soil containing high amount of salt and organic matter. Also, they absorb the metals, organic matter, nutrients and water from the sewage.

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Two properties of electromagnet

Posted by Kanishka Sisodia 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Ritesh Bihari 7 years, 1 month ago

In always point in nort south direction

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Yogita Ingle 7 years, 1 month ago

In terms of material used in electro magnets and permanent magnets, the cost of materials used in electro-magnet that is, soft iron core is less compared to the hard material used in permanent magnets.
The magnetic strength of an Electro-Magnet can be altered according to our convenience, whereas the magnetic field of permanent magnet cannot be changed.

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Why do you think accurate measurement of time became much possible after accurate measurement of length and mass

Posted by Arshjyot Kaur Baluja 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Niyati Niyati 7 years, 1 month ago

Time taken by an object depend upon its length and mass. That is why by measuring length and mass accurately..we can measure time accurately.

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What is fragmantation

Posted by Jiven Ghaisita 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Ayesha Khatua 7 years, 1 month ago

When the water and nutrients are available alga grow and multiply rapidly into two or more fragments. This pieces or fragments grow into individuals known as fragmentation. This process continious and they cover a large area in a short period of time.

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Abhi Khosla 7 years, 1 month ago

The fragmantation is the method which reproduce spirogyra. It breaks the fragments into two filament. These filament grow to form new fragments.

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