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

Near the burning gas stove, there is heat in the air. Due to the radiation of heat, the thin plastic polymer can get heated up and melt easily. Due to this there will be holes in the bag. If there is any thing in the bag, it will get spoilt or polluted.

Also the vapour of plastic bags produce toxic gases. It is not good for health.

2Thank You

ANSWER

Synthetic fibres are known as _and_fibres???

Posted by Rakesh Kumar 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Shreya Sarangi 6 years, 8 months ago

Artificial and mam made fibres

1Thank You

ANSWER

Despite being one of the growing economies our country has a large section of population going hungry and malnourished . Do you think an efficient crop production mechanism is the only solution to this? Explain what else needs to done to root out hunger and malnutrition from our country

Posted by Shivangi Jyotsana 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

I think the only method is hybridization. Food should not be waste.

2Thank You

ANSWER

What is a

Posted by Naveen Ror Ror 6 years, 8 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

what is a combustible substance

Posted by Naveen Ror Ror 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

Combustible substances undergo combustion like cloth, cooking gas, wood, charcoal, matchstick, etc. A combustible substance is also called a fuel.

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ANSWER

What is different between manures and fertilizers 10 points

Posted by Niharika Agiwal 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

Manure are natural while fertilizer are man made. Manure prepare in the field while fertilizer prepare in the factory. Manures are not harmful for health whereas fertilizer are harmful for health. Manure are organic where as fertilizer are inorganic. Manure are Rich in compost where as fertilizer are rich in nutrients like NPK. Manure are prepared from animal wastes or green plants where as fertilizer are prepared from chemicals.

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Should the handle and bristles of a tooth brush be made of the same material?explain your answer

Posted by Barar Sajid 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Bhumika Tisha 6 years, 8 months ago

No bcoz if the bristles will be made of plastic then it will hurt us

0Thank You

ANSWER

How are virusese different from other organisms

Posted by Sheikh Wahid 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

Viruses differ from other micro-organisms because they are too much smaller in comparison to other micro-organisms. They do not show most of the characteristics of the living organisms like respiration. They just reproduce. They, however, reproduce only inside the cells of the host organism, which may be a bacterium, plant or animal. Hence, viruses differ from other micro-organisms.

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ANSWER

What is 1pa of pressure

Posted by Suman Dahiya 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

The force acting on a unit area of a surface is called pressure.

Pressure = Force / Area on which it acts

The SI unit of measuring pressure is ‘newtons per square metre’ (N/m²) which is also called Pascal.

1 Pascal pressure is the pressure exerted on one newton force per square metre.

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ANSWER

advantages and disadvantages of manure

Posted by Ojas Mehrotra 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

Advantage:- manures are not costly. Manures are not harmful. They are rich in compost organic matter. Manure don't harm the soil. Disadvantage:- manure don't have nutrient like nitrogen, phosphorus and potassium.

1Thank You

ANSWER

Microorganism can be seen with the help of s

Posted by Sunit Kumar 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Alok Prakash 6 years, 8 months ago

Microscrope

1Thank You

ANSWER

Yeast helps in the production of

Posted by Jayram Pal 6 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Dharmendra Kushwaha 6 years, 7 months ago

Alcohol

1Thank You

Alok Prakash 6 years, 8 months ago

I think alcohol n baking

0Thank You

ANSWER

What are plastics?

Posted by Harman Chahal 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Shreya Sarangi 6 years, 8 months ago

Plastic is a polymeric substance which can be moulded when soft. It is made soft by applying heat and pressure. Plastic can be recycled, reused, coloured, melted, rolled into sheets.

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ANSWER

What are synthetic fibre?

Posted by Harman Chahal 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Hermoine Granger 6 years, 8 months ago

Fibre that are produced in factories and use petrochemicals as raw materials are known as synthetic fibre

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ANSWER

The name of an antitrnspirant

Posted by Vinayak Asthana 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

Pine oil

1Thank You

ANSWER

Three example of non contact force

Posted by Sharda Badaik 6 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Bajaj Pulsar 6 years, 8 months ago

2 magnets attract or repel each other, a ball falls from a height

0Thank You

Hermoine Granger 6 years, 8 months ago

Magnetic, electrostatic, gravitational

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ANSWER

Definition of mascular force with one example

Posted by Sharda Badaik 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Samruddhi Br 6 years, 8 months ago

The force applied by by the muscles on an object is called muscular force... Ex - lifting the bag

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ANSWER

Fill in the blanks . 4_ D Is an example of

Posted by Nancy Yadav 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Dharmendra Kushwaha 6 years, 7 months ago

0Thank You

ANSWER

How is milk converted into curd

Posted by Abhishek Tikke 6 years, 8 months ago

CBSE > Class 08 > Science

4 answers

Dharmesh Parikh 6 years, 8 months ago

Conversion of milk into curd is done by lactobacillus

1Thank You

Yash Bhosale 6 years, 8 months ago

By the help of Lactobacillus

1Thank You

Saanvi Tripathi 6 years, 8 months ago

Milk is turned into curd by bacteria.

1Thank You

Yogita Ingle 6 years, 8 months ago

Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. The curd forms because of the chemical reaction between the lactic acid bacteria and casein. During fermentation, the bacteria use enzymes to produce energy (ATP) from lactose. The byproduct of ATP production is lactic acid. Lactic acid acts on the globular proteins present in the milk and denatures them. This denaturation destroys the tertiary and quaternary structures of proteins and the globular proteins are converted into fibrous proteins thus giving a thick texture to the milk due to coagulation of the proteins.

3Thank You

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Tell some property of metal and non metal

Posted by Mandakini Bankar 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Puppy L 6 years, 8 months ago

3Thank You

ANSWER

What do you mean by communicable decies

Posted by Aayush Kumar 6 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Anik Kumar 6 years, 8 months ago

The diseases which can be transfered to one to another through skin, blood etc that disease called communicable disease

0Thank You

Yogita Ingle 6 years, 8 months ago

Communicable diseases are the diseases which spread from an infected person to a healthy person by direct contact. Communicable diseases are caused by some pathogens like bacteria, viruses, fungi, helminths and protozoans.
Bacteria can cause diseases like Tuberculosis, Leprosy, Cholera, Food-poisoning, Sexually transmitted diseases.
Viruses can cause diseases like chicken pox,small pox,measles, poliomyelitis, mumps, rabies etc.
Fungi can causes skin diseases.
Protozoans can cause Malaria, Kala-azar, Ameobiasis etc .
Helminths can cause Taeniasis, Cysticercosis, Ascariasis etc.

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ANSWER

Name the machine used for sowing seeds

Posted by Binit Nath 6 years, 8 months ago

CBSE > Class 08 > Science

4 answers

Hermoine Granger 6 years, 8 months ago

Seed drill

0Thank You

Abhishek Tikke 6 years, 8 months ago

Seed drill

0Thank You

Anik Kumar 6 years, 8 months ago

,,. ,,

0Thank You

Yogita Ingle 6 years, 8 months ago

Sowing is the process of addition of seeds into the soil. Seeds are sown in the field by hand or by using seed drill. There are traditional seed drills as well as modern seed drills.

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ANSWER

What is the branch of science for rearing livestock.

Posted by Rudrakshi Jindal 6 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Riddhima Agarwal 6 years, 8 months ago

Agriculture

1Thank You

Anik Kumar 6 years, 8 months ago

Animal husbandry

0Thank You

Rudrakshi Jindal 6 years, 8 months ago

AGRICULTURE

1Thank You

ANSWER

Who is protozoa

Posted by Kavyansh Rawal 6 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Yogita Ingle 6 years, 8 months ago

Protozoa are one-celled organisms that can cause diseases ranging in severity from mild to deadly. These organisms can be classified as parasitic or free-living.
Parasitic protozoa are found in organisms such as ticks, flies and mosquitoes. Example: Malaria. Malaria is carried by an infected mosquito.

0Thank You

Omprakash Swain 6 years, 8 months ago

Protozoa is a disease causes by mosquito

0Thank You

ANSWER

Why do farmers normally use a mixtures of manures and ferrilizers in their fields ?

Posted by Kamal Kapali 6 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Anik Kumar 6 years, 8 months ago

Farmers normally mixes manure of manure and fertilizer for maintaining their fertility

0Thank You

Yogita Ingle 6 years, 8 months ago

As the seeds germinate, the growing saplings should be provided with nutrients and water. Hence soil should be replenished with minerals in periodic intervals of time. Manure and fertilisers supply nutrients to the soil. This is called as replenishment of nutrients.
Manure and fertilisers replenish the soil by supply nutrients to the soil.
*Manure is the organic matter added to the soil to replenish it with nutrients. The wastes from household, animal dung and agricultural wastes are buried in small pits. Decomposition by bacteria and earthworms occurs in these pits converting organic wastes into manure. Manure increases the water retention capacity of soil.Manure is ecofriendly and replenishes the soil with nutrients which can persist for longer time whereas fertilisers though not ecofriendly supply nutrients for immediate usage by the plants.
*Fertilisers supply specific type of nutrients for the plant. Fertilisers are the chemicals which add minerals like potassium, phosphorus and nitrates to the soil.

0Thank You

ANSWER

Write a note on the uses of synthetic fibres

Posted by Nijira Brahma 6 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Harman Chahal 6 years, 8 months ago

Synthetic fibres are made from different chemicals, hence ,each kind of synthetic fibre or material has its own properties.Synthetic fibre are more in length and strong. Limitation of synthetic fibre: 1).They are poor absorbent of moisture. 2). They catch fire very easily.

0Thank You

Omprakash Swain 6 years, 8 months ago

Synthetic fiber are use in many clothes like dress, shirt, blaser,etc,.synthetic fibres are nylon , polester,etc.,called synthetic fiber????

0Thank You

ANSWER

What is insulin

Posted by Shail Singh 6 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

Insulin is a hormone made by the pancreas that allows your body to use sugar (glucose) from carbohydrates in the food that you eat for energy or to store glucose for future use. Insulin helps keeps your blood sugar level from getting too high (hyperglycemia) or too low (hypoglycemia).

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