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

Lactobacillus is used to form curd from milk. Rhizobium present in pulse plants’ roots fix nitrogen from the air and supply nitrogen compounds to the pulse plants. Micro-organisms are also used in winemaking, baking, pickling, and other food-making processes. Alcoholic fermentation by yeast is widely used in the preparation of wine and bread. Microbes are used to reduce pollution. For example, decomposers such as bacteria and fungi break down dead bodies and excreta to form inorganic compounds, which plants can absorb. Microbes also play an important role in the preparation of medicines. Antibiotics are chemicals produced by microorganisms to kill bacteria. Penicillin is an antibiotic made from Penicillium. Bacteria in our intestine helps in proper digestion and release vitamin B, absorbed by the intestine. Many vaccines are prepared from micro-organisms. These vaccines are given to children to protect them from the disease. Certain microbes are also used in the biological treatment of sewage and industrial effluents. Yeast is used in making idli, bhaturas, bread, pastries, and cakes.

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Sa. Rajput 4 years, 2 months ago

Rfffrgedwsqadhjgdvsdffyfgufduyjuklkioojhjojyjoh

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Explain the formation of coal ?

Posted by Harshita Dogra 4 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Kanu Choudhary 4 years, 2 months ago

When dead plant matter burried deep to the layer of soil. Due to high temperature and pressure this matter is convert into coal. And this process contains millions of years.

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Aditi Rajput 4 years, 2 months ago

Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. ... Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.

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Define ' Force ' ?

Posted by Harshita Dogra 4 years, 2 months ago

CBSE > Class 08 > Science

3 answers

Sachin Sawandkar 4 years, 2 months ago

push or pull on the object is called force.

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Aasma Singla 4 years, 2 months ago

It is a push or pull to that affects an object in some way ia called force. It is a measurable quantity. The si unit of magnitude of force is Newton (N)

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Aditi Rajput 4 years, 2 months ago

A push or pull on the object is called force.

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Define the term 'cell wall' ?

Posted by Harshita Dogra 4 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Aasma Singla 4 years, 2 months ago

It is an additional wall outside the cell membrane. It is present in cell walls fungi and bacteria. The cell wall is important for plants since they don't have a skeleton for support and protection

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What are combustible substances ? Name one ?

Posted by Harshita Dogra 4 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Aasma Singla 4 years, 2 months ago

Substances that can easily catch fire in the presence of oxygen. They are mainly hydrocarbons. Eg, wood, paper,petrol etc.

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What are pollutants ? Give example ?

Posted by Harshita Dogra 4 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Aasma Singla 4 years, 2 months ago

Any substance in air,soil,water etc. that causes harm to living beings and the environment called pollutants. Eg,suspended particulate matter (spm), carbon monoxide

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Matter and its property page number

Posted by Kandasamy Kandasamy 4 years, 2 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Name the powerhouse of the Cell ?

Posted by Harshita Dogra 4 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Aditi Rajput 4 years, 2 months ago

mitochondria

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A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad

Posted by Zenha Nasrin 4 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Vanshpreet Kaur 4 years, 1 month ago

The 2 forces that are acting are friction and gravitational force

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The study of microorganisms

Posted by Theerdha P L 4 years, 2 months ago

CBSE > Class 08 > Science

5 answers

Aasma Singla 4 years, 2 months ago

Microbiology

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Aditi Rajput 4 years, 2 months ago

Microbiology

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Harshita Dogra 4 years, 2 months ago

Microbiology

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Sonia Khan 4 years, 2 months ago

Microbiology

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Anushka Baresa 4 years, 2 months ago

Microbiology

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Synthetic fibers are called _____ or _____ fibers

Posted by ?Sachin? ? 4 years, 2 months ago

CBSE > Class 08 > Science

5 answers

Ananya Sharma 4 years, 1 month ago

Artificial or man made

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Aditi Rajput 4 years, 2 months ago

Artificial or man made

1Thank You

Janya.U Janya.U 4 years, 2 months ago

Man made or artificial

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Sonia Khan 4 years, 2 months ago

Artificial or man made

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Anushka Baresa 4 years, 2 months ago

Artificial or man-made.

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Which of the following can be beaten into thin sheet

Posted by 😈😈Tanmay Raj 4 years, 2 months ago

CBSE > Class 08 > Science

5 answers

Aasma Singla 4 years, 2 months ago

Metals this property is called malleability. Eg, iron, alluminium etc.

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Lavanya N 4 years, 2 months ago

Metals

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?Drasty Patel? 4 years, 2 months ago

Iron. Steel copper bronce

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Aditi Patil 4 years, 2 months ago

Mellablity

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Anushka Joshi 4 years, 2 months ago

iron steel copper bronze

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Which people invention of TV

Posted by Manpreet Kaur Kaur 4 years, 2 months ago

CBSE > Class 08 > Science

3 answers

?Drasty Patel? 4 years, 2 months ago

Philo fans worth

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Manpreet Kaur Kaur 4 years, 2 months ago

Thanks

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Muthu Kumaran Koteswari 4 years, 2 months ago

Philo fans worth

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Please anybody answer to my question

Posted by Monish Kumar 4 years, 2 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Name 11 elements in the periodic table

Posted by Monish Kumar 4 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Muthu Kumaran Koteswari 4 years, 2 months ago

Sodium

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What are the difference between metals and nonmetals

Posted by Monish Kumar 4 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Aditi Patil 4 years, 2 months ago

Metals are hard,lustrous, malleable, ductile, sonorous and good conductor's of heat and electricity While Non metals are sonorless and insulator

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Adhar Abass 4 years, 2 months ago

Metals are good conducters of heat and electricity where as non metals are bad conducters of heat and electricity

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What is aqua regia solution

Posted by Monish Kumar 4 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Aasma Singla 4 years, 2 months ago

Aqua regia solution is 3 parts of hydrogen and 1 part of nitrogen

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Piyush Kashyap 4 years, 2 months ago

Aqua regia is a solution of nitrohydrochloric acid

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Give two example of rabi crop

Posted by ?Aditi Sharma? 4 years, 2 months ago

CBSE > Class 08 > Science

4 answers

Lavanya N 4 years, 2 months ago

Wheat , gram , pea , mustard , and linseed .

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Anushka Baresa 4 years, 2 months ago

Wheat and mustard

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Monish Kumar 4 years, 2 months ago

Mustard and linseed

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Fatima Rahman❣️❣️ 4 years, 2 months ago

Wheat and gram

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Ch 8 practical video

Posted by Divya Shah 4 years, 2 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Give one example to prove that supporter of combustion is necessary for combustion

Posted by Prince Yadav 4 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Aasma Singla 4 years, 1 month ago

Oxygen gas is the supporter of combustion and nitrogen, carbon dioxide, hydrogen are non supporter of combustion

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What are contact forces?

Posted by Ira Sengupta 4 years, 2 months ago

CBSE > Class 08 > Science

3 answers

Sweeti Singh. 4 years, 2 months ago

Contact Force: – When force is applied physically through a direct contact Between the two bodies it is called Contact force.

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Anand Kumar 4 years, 2 months ago

A contact force is a force that applied to the in contact of the object if we applied in the force contact of the body is called contact force

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Fatima Rahman❣️❣️ 4 years, 2 months ago

A contact force is any force that requires contact to occur. Contact forces are ubiquitous and are responsible for most visible interactions between macroscopic collections of matter. Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work.

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Which of the following does not happen due to friction

Posted by Sherlyn Desai 4 years, 2 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Write difference between audblie and inaudible sound

Posted by Samir Patel 4 years, 2 months ago

CBSE > Class 08 > Science

2 answers

Harshita Dogra 4 years, 2 months ago

Audible sounds :- which we can hear . Inaudible sounds :- which we can't hear .

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Fatima Rahman❣️❣️ 4 years, 2 months ago

Audible Sounds are the sounds of frequency which are audible to the human ear. ... Inaudible sounds are the sounds of frequency which are not audible to the human ear.

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Which crops are sown in the rainy season

Posted by Ansuman Sahu 4 years, 2 months ago

CBSE > Class 08 > Science

4 answers

Anand Kumar 4 years, 2 months ago

Kharif crop

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Vijay Upadhyay 4 years, 2 months ago

Kharif crop

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Kanu Choudhary 4 years, 2 months ago

Kharif crop

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Aditi Rajput 4 years, 2 months ago

Kharif crops

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Class 8 Science chapter : Force and Pressure , Extended Activities and Project last page of chapter questions answers required ,??

Posted by Hitesh Singodia 4 years, 2 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Any 4 Disadvantages of organic manure

Posted by Hema Sigamani 4 years, 2 months ago

CBSE > Class 08 > Science

1 answers

Ronak Choudhary 4 years, 2 months ago

1)Nutrient levels are low 2)not all products are created equally 3)DIY compost is a complicated procedure

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what are the effect of deforestation

Posted by Anjali Kumari 4 years, 2 months ago

CBSE > Class 08 > Science

5 answers

Harshita Dogra 4 years, 2 months ago

1) Soil erosion 2) Loss of trees 3) Increase in carbon dioxide in atmosphere .

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Fatima Rahman❣️❣️ 4 years, 2 months ago

The loss of trees and other vegetation can cause climate change, desertification, soil erosion, fewer crops, flooding, increased greenhouse gases in the atmosphere, and a host of problems for indigenous people.

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Aditi Rajput 4 years, 2 months ago

Effects of deforestation are as follows #Loss of trees #Soil erosion #Increased greenhouse gase affect in atmosphere

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Ronak Choudhary 4 years, 2 months ago

Effects of deforestation are as follows Loss of trees Soil erosion Increased greenhouse gases

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Kheem Singh 4 years, 2 months ago

Hi anjali?

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Keep safe and first aid chapter ka all question and