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

The process in which milk is heated about 70 degree Celsius and suddenly chilled up . It increase the microbes. The process was discover by Louis Pasteur . So it is called pasteurization

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Kaya Mishra 7 years, 3 months ago

In this process the milk is converted into curd the milk is heated about 70 for 15to30seconds and the suddenly chilled and stored

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What is main topic in chapter control and cordnation .

Posted by Sushil Kumar 7 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Keerthana C 7 years, 3 months ago

Sorry I don't know I was like which chapter

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Keerthana C 7 years, 3 months ago

????

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Ravi Kumar 7 years, 3 months ago

About hormones and nerves

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What is the function of nerve cell.

Posted by Namanjot Kaur 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Sakshi Jadhav 7 years, 3 months ago

Nerve cell receive and transfer the messages thereby helping to control and corrdinate the part of body

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Explain the formation of coal

Posted by Nishant Sharma 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Nishant Sharma 7 years, 3 months ago

Under the high pressur and high temprature dead plant got slowly converted into coal

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Posted by Gayathri P 7 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Madhav Madan 7 years, 3 months ago

Hlo

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Sruti Banarjee 7 years, 3 months ago

Hallo

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What is callerific value

Posted by Subrat Dash 5 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Namanjot Kaur 7 years, 3 months ago

Kilojoule per kg (kj /kg) is the unit of calorific value.

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Namanjot Kaur 7 years, 3 months ago

Heat produced in the complete combustion of 1kg of fuel is called its calorific value.

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Name one non metal used in making crackers.

Posted by Namanjot Kaur 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Arushi Chandurkar 7 years, 3 months ago

Sulphur

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What is difference between winnowing and threshing?

Posted by Nishu Singh 7 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Madhav Madan 7 years, 3 months ago

The separation of grains from chaff with the help of thresher is callled threshing

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Ritik Dhakad 7 years, 3 months ago

Threshing is the method of sepaprting the grains from inedible part that surrounds it; whereas winnowing is the process of separating the grains from a mixture of chaff with the help of wind

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Namanjot Kaur 7 years, 3 months ago

• In the harvested crop, the separation of grain from chaff is called threshing, it is carried out with the help of combine. • Farmers with small holdings of land do the separation of grain from chaff by winnowing.

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Heating effect of electric current

Posted by Shivani Pakdhune 7 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Yogita Ingle 7 years, 3 months ago

When a current flows through a conductor, heat energy generates in the conductor. The heating effects of electric current depend on three factors:

The resistance of the conductor. A higher resistance produces more heat.
The time for which the current flows. The longer the time the amount of heat production is high.
Higher the current the amount of heat generation is also large.

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Mohit Sharma 7 years, 3 months ago

Fjs

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How many glands are there in human body

Posted by Nova Meyer 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 11 months ago

There are many hormones other than *** hormones like growth hormone, thyroxine, insulin and adrenaline. The important endocrine glands and their functions are:

Pituitary gland: Pituitary gland is attached to the base of the brain and secretes a number of hormones. One of the hormones secreted by pituitary gland is growth hormone. A person having the deficiency of growth hormone in childhood remains very short or becomes dwarf. A person having too much growth hormone becomes very tall or a giant. Pituitary gland is called the master gland of the body because it controls the functioning of other endocrine glands.
Thyroid gland: Thyroid is a large endocrine gland in the neck. It is attached to the wind pipe and makes a hormone called thyroxine. Thyroxine controls the rate of metabolism of the body. The deficiency of thyroxine hormone causes a disease called goitre. The main symptom of goitre disease is that the neck of the person suffering from this disease appears swollen. People are advised to use iodised salt for cooking food to prevent goitre.
Pancreas: Pancreas is located just below the stomach. It secretes a hormone called insulin. The function of insulin is to lower the blood sugar level. Deficiency of insulin in the body causes a disease called diabetes.
Adrenal gland: There are two adrenal glands located on the top of the kidneys. The adrenal glands produces adrenaline hormone which prepares our body to function at maximum efficiency during emergency situations like anger, fear, danger, excitement, etc.

The adrenal glands also secrete hormone called aldosterone which maintains the correct salt balance in the blood.

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What is fusion

Posted by Khushboo Prasad 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 3 months ago

Fusion would be defined as the joining of two or more small atoms to form a large atom. The release of energy in fusion is way higher than that of the fission reaction. Fusion happens in natural forces like stars and sun. Hydrogen isotopes are used as fuel in experimental plants.

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The meaning of fertilisation

Posted by Sudhir Kariveti 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Samya Roy 7 years, 3 months ago

Fertillisation

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What is organelles?mention the function of various cell organelles?

Posted by Ansh Yadav 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Shreya Bhattacharyya 7 years, 3 months ago

The various compounds present in the cytoplasm are called organelles.These are like golgi bodies,ribosome,etc.

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Can a rustion of iron is combustion . Why?

Posted by Pinki Singla 7 years, 3 months ago

CBSE > Class 08 > Science

4 answers

Shreya Prajapati 7 years, 3 months ago

During combustion

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Shreya Prajapati 7 years, 3 months ago

No because during heat is also produced whereas in rusting heat is not produced...

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Namanjot Kaur 7 years, 3 months ago

Yes, the rusting of iron is a process combustion. It is the exothermic process. It is a chemical process, when a substance reacts with oxygen to give of heat or light is called combustion. Rusting of iron is a slow combustion.

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Shreya Bhattacharyya 7 years, 3 months ago

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diffrentiate between internal fertilisation anexternal fertilisation

Posted by Faizan Ansari 7 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Keerthana C 7 years, 3 months ago

Which spelling everything is All right

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Shreya Bhattacharyya 7 years, 3 months ago

See the spelling first

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What are the two methods of weed and also define if

Posted by Rk Ranjan 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 3 months ago

Weeds are plants that grow in a place where it is undesirable. Weeds compete with the desirable plants in the field for food, water, sunlight and even for space.Weeds also act as a host for spreading plant diseases.

Cultural methods such as crop rotation, selecting best suited crops for competition, scouting fields regularly are effective in controlling weeds.
Mechanical and physical methods of weed control include hand pulling, digging, howing, mulching etc.
Biological control include using insects or pathogens for killing the weeds.
Chemical control include using chemicals such as weedicides.

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What do you mean by fuel efficiency?

Posted by Sikun Sahoo 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 3 months ago

That proportion of energy released by a fuel combustion process which is converted into useful work. For vehicles, it is measured in miles per gallon or kilometers per liter.
The amount of energy produced in the form of heat as result of combustion of complete combustion of 1Kg of fuel is known as calorific value of fuel expressed in unit called kilojoule per Kg (kJ/Kg).

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How does sound propagate through different medium?

Posted by Virat Roy 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 3 months ago

<div>The traveling of sound is called propagation of sound. Sound cannot propagate in the absence of a medium. The place where there is no air or air is removed, is called vacuum. Sound does not propagate (travels) through vacuum.</div> <div>Sound travels through solid, liquid and gas.</div> <div>We usually hear sound which comes to us through air.</div> <div>Aquatic animals communicate as sound travels through water also.</div> <div>We hear the sound through ear.</div>

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What do you mean by organelles ?

Posted by Akashee Singh 7 years, 3 months ago

CBSE > Class 08 > Science