Groups of Micro-organism

Soumya Pagarani 4 years ago

It is the SI unit of sound

Prachi Saxena 4 years ago

The hertz is the derived unit of frequency in the International System of Units and is defined as one cycle per second. It is named after Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.

ANSWER

Why the plane is prepared like a bird

Posted by Jeevan Kumar 4 years ago

CBSE > Class 08 > Science

3 answers

Madhu Yadav Yadav 4 years ago

Every rhombus is a square

Pratish Behera 4 years ago

Yogita Ingle 4 years ago

Though the shape of aeroplanes are not like bird but the function of aeroplanes are like birds. the aeroplane makers made aeroplane aerodynamics that will help aeroplane to glid in air like eagle. in this mechanism the fuel efficiency will increase and the aeroplane will travel much long path . And it also helps when the plan take of or land

ANSWER

Emergency hormone are absent in female.true or false

Posted by Debashish Chhatria 4 years ago

CBSE > Class 08 > Science

1 answers

Prachi Saxena 4 years ago

I think it's False

ANSWER

What are meteorites?

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

2 answers

Prachi Saxena 4 years ago

Thank you

Yogita Ingle 4 years ago

Meteors are the celestial bodies from the sky which we see as a bright streak of light that flashes for a moment across the sky. The meteors are commonly called shooting stars. When a meteor enters into the atmosphere of Earth with high speed, a lot of heat is produced due to the resistance of air

ANSWER

What is Anod

Posted by ẞøñú Yãdãv 4 years ago

CBSE > Class 08 > Science

2 answers

Yogita Ingle 4 years ago

In the most basic form, an anode in electrochemistry is the point where an oxidation reaction occurs. Generally, at an anode, negative ions or anions due to its electrical potential tend to react and give off electrons. These electrons then move up and into the driving circuit.

Prachi Saxena 4 years ago

An anode is an electrode through which the conventional current enters into a polarized electrical device. ... In both a galvanic cell and an electrolytic cell, the anode is the electrode at which the oxidation reaction occurs. In an electrolytic cell, the anode is the wire or plate having excess positive charge.

ANSWER

Why is yeast used to prepare the dough of dosa and idli?

Posted by Shaayeq Parvez 4 years ago

CBSE > Class 08 > Science

3 answers

Dhritishman 9A 4 years ago

Prachi Saxena 4 years ago

Yeast is used as a raising agent in baking. ... As a result, a soft and spongy baked product is formed. Microbes also play a vital role in fermenting idli/dosa batter. Idli/ dosa batter contain Urad pulses

Gaurav Seth 4 years ago

Microbes also play a vital role in fermenting idli/dosa batter. Idli/ dosa batter contain Urad pulses. These Urad seeds contain Lactic Acid Bacteria (LAB). These bacteria lead to the formation of Lactic acid and CO2. Formation of Lactic acid gives a sour taste to the batter. Therefore, the batter should not be fermented for too long, else it might turn too sour.

ANSWER

What is electroplating ? Any body can explain it for me.

Posted by Shubham Singh Rajput 4 years ago

CBSE > Class 08 > Science

2 answers

ẞøñú Yãdãv 4 years ago

The process of deposited a layer of one metal to another metal with the help of electricity is called electroplating

Yogita Ingle 4 years ago

Electroplating: The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating. it is one of the most common application of chemical effects of electric current.

• Uses of Electroplating: Electroplating is widely used in indust for coating metal objects with a thin layer of a deferent metal. This may be done to

— make objects appear shiny,

— prevent corrosion,

— make objects resistant to scratches.

— coat less reactive metal on more reactive metals to protect from getting spoilt,

— electroplate less expensive metals with silver and gold to make ornaments.

ANSWER

Name any two human diseases caused by viruses.

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

5 answers

Shubham Singh Rajput 4 years ago

Measles and polio

Prachi Saxena 4 years ago

Thanks

ᴺˣᵀ Ꭾᴇʀꜰᴇᴄꭲ ☃︎ 4 years ago

Influenza Measles

Prachi Saxena 4 years ago

Thank you so much

Yogita Ingle 4 years ago

Viral diseases are infections caused by viruses. Different types of viruses cause different infections. Common cold is the most common type of viral infection that is caused by infections in the respiratory tract. Other viral diseases include:

Chickenpox
Herpes
Influenza
AIDS
Mumps
Measles
Viral Hepatitis

ANSWER

Name any three common plant diseases.

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

4 answers

Prachi Saxena 4 years ago

Thank you

Shubham Singh Rajput 4 years ago

Citrus canker And Rust of wheat

Prachi Saxena 4 years ago

Thank you so much

Yogita Ingle 4 years ago

The plant disease called rust of wheat is caused by fungi.
The plant disease called citrus canker is caused by bacteria.
The plant disease called yellow vein mosaic of bhindi is caused by a virus.

ANSWER

What is the use of yeast.

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

5 answers

Prachi Saxena 4 years ago

Thank you

ẞøñú Yãdãv 4 years ago

Yests are useful for making some food item cake and alcohol. Process by which suger converted into alcohol is called fermentation.

Shubham Singh Rajput 4 years ago

Yeast are useful for fermentation of rice idli and dosa batter . It also promotes the formation of curd and bread. Microorganisms like yeasts are also used for the large scale production of alcohol and acetic acid. I think this answer would be better for your question. ??

Prachi Saxena 4 years ago

Thank you so much

Yogita Ingle 4 years ago

Yeast is used as a raising agent in baking. Most commonly used yeast is Saccharomyces cerevisiae. It is due to the action of yeast that the dough rises, if you leave it for sometime adding yeast to it during kneading.

ANSWER

Q2 A simple pendulum makes 10 oscillations in 20 s. What is the time period and frequency of its oscillations?

Posted by Christina Shaju 4 years ago

CBSE > Class 08 > Science

2 answers

Yogita Ingle 4 years ago

When a simple pendulum makes 10 oscillations in 20 seconds, the time taken for each oscillation = 20/10 = 2 seconds.
Hence, as the time period is calculated to be 2 seconds, the frequency of oscillation = 1/T = 1/ 2 = 0.5 Hertz.
Therefore, the frequency of that pendulum is found to be 0.5 Hz.

Prachi Saxena 4 years ago

20 =2s Frequency =1/Period 2 1 =0.5Hz

ANSWER

Q1An object is vibrating at 50 Hz. What is its time period?

Posted by Christina Shaju 4 years ago

CBSE > Class 08 > Science

1 answers

Prachi Saxena 4 years ago

T = 1/ f = 1/50 = 0.02 s.

ANSWER

Name any four things made from mango that we can preserve?

Posted by Anuj Chourasia 4 years ago

CBSE > Class 08 > Science

3 answers

Ayushi Singh 4 years ago

Mango pickle ,mango rosted carry

Prachi Saxena 4 years ago

1=Mango pickle 2=Mango ice cream 3=Mango shake 4= Mango slice

Christina Shaju 4 years ago

Mango pickle

ANSWER

Why is more oil and salt added to pickle?

Posted by Anuj Chourasia 4 years ago

CBSE > Class 08 > Science

1 answers

Prachi Saxena 4 years ago

Salts and edible oils are the common chemicals generally used to check the growth of microorganisms. Therefore they are called preservatives. We add salt or acid preservatives to pickles to prevent the attack of microbes.

ANSWER

Why we do not sense any pain when we cut nails and hair?

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

5 answers

Shubham Singh Rajput 4 years ago

We doesn't feel any pain while cutting nails and hair because the cells that is present in them are dead. these cells are called epithelial.

Prachi Saxena 4 years ago

Thanks

Yogita Ingle 4 years ago

We do not feel any pain when we cut our nails or hair because both nails and hair do not have nerves to send messages to the brain. They are dead cells.

Prachi Saxena 4 years ago

Thank you so much

Christina Shaju 4 years ago

We don't sense any pain when we cut hair because we cut it above the skin which is a dead skin if we pluck out a hair of ours we will feel pain because we have plucked it from the hair

ANSWER

What is Adam's apple?

Posted by Rajesh Parida 4 years ago

CBSE > Class 08 > Science

2 answers

Happy Vats 4 years ago

When the larynx grows larger during puberty, it sticks out at the front of the throat. This is what's called an Adam's apple. Everyone's larynx grows during puberty, but a girl's larynx doesn't grow as much as a boy's does. That's why boys have Adam's apples.

Yogita Ingle 4 years ago

Adam’s apple: The protruding part of the throat is called Adam’s apple.

It is the enlarged voice box or larynx which gets enlarged and visible from outside in boys at the onset of puberty. This makes the voice of boys hoarse.

ANSWER

How do micro - organisms cause food poisoning

Posted by Anuj Chourasia 4 years ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 4 years ago

Food can be poisoned by microbes. Microbes produce toxic substances and thus, poison/ spoil the food. Consuming spoiled food can make us ill. Therefore it is very important to preserve food items so that microbes cannot grow & spoil them. Microbes just don’t attack any food item, they need a suitable environment to grow & survive. Only then, they can release toxic substances and thus spoil the food. Some factors which promote growth of microbes are moisture, warm temperature etc.

ANSWER

If you hold a piece of iron wire with a pair of tongs inside a candle flame or a Bunsen burner flame, what will you observe? Will it produce a flame?

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

2 answers

Prachi Saxena 4 years ago

Thanks

Yogita Ingle 4 years ago

The iron wire becomes red and glows. It doesn't produce a flame.

ANSWER

Which fossil fuel is generally referred to as clean fuel and why?

Posted by Gourav Kumar 4 years ago

CBSE > Class 08 > Science

3 answers

Rahul Gupta 4 years ago

Cng is the clean burning ? because it does not produce any smoke

Yogita Ingle 4 years ago

Fossil Fuels = fossil fuels are obtained by digging wells deep under the earth's surface. ... CNG is widely used in industries and in vehicles as a fuel because no pollution is caused by it.

Santosh Thakur 4 years ago

Yash

ANSWER

Whole word is suffering from a pandemic now days. Name the pandemic and the microorganism by which it is spread? And mention some ways to prevent it.

Posted by Anuj Chourasia 4 years ago

CBSE > Class 08 > Science

4 answers

Sushma R 4 years ago

Corona virus

Gourav Kumar 4 years ago

Covid -19

Nishu Singh 4 years ago

Corona

Prachi Garg 4 years ago

Corona Virus

ANSWER

Explain thrust in your own words

Posted by Ronak Dahiya 4 years ago

CBSE > Class 08 > Science

1 answers

Nishu Singh 4 years ago

Trust is the pressure

ANSWER

What is the gravity?

Posted by Palak Sharma 4 years ago

CBSE > Class 08 > Science

4 answers

Shruti ? 3 years, 11 months ago

Objects or things fall towards the earth because it pulls them. This force is called the force of gravity or just gravity

Nishu Singh 4 years ago

The force extend by the earth core which attract everything to word is is called gravity

Yogita Ingle 4 years ago

Gravity is a force that attracts a body towards the centre of the earth, or towards any other physical body having mass.

Every object that has mass exerts a gravitational pull or force on every other mass. The strength of this pull depends on the masses of objects at play. Gravity is what keeps the planets in orbit around the sun and the moon around the Earth

Ronak Dahiya 4 years ago

The force exerted by the earth ? which attracts everything towards it

ANSWER

Name the chromosome present in a male.

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

3 answers

Shruti ? 3 years, 11 months ago

X and Y chromosome

Prachi Saxena 4 years ago

Thanks

Nishu Singh 4 years ago

Croma sperm are the present inside then nucleus of every cells in the human body all human being at 33 pairs of chromosomes hormones in the nuclear of this normal body sell out of the there 33 pairs of chromosomes force one pair pair of Thomas was 10 calls promise phone

ANSWER

Name the hormone in female that is produced by ovaries and helps in development of mammary glands.

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

3 answers

Prachi Saxena 4 years ago

Thanks

Yogita Ingle 4 years ago

Estrogen and progesterone are the female hormones produced by ovaries that ensure proper female development and fertility. Both these hormones have direct effects on the development of mammary glands. These are absolutely essential for the development of mammary gland.

Gaurav Seth 4 years ago

ANSWER

(6X^2 -22x +21 )/(5x^2-18x +17)

Posted by Prachi Saxena 4 years ago

CBSE > Class 08 > Science

1 answers

Roshni Kumari 4 years ago

What are the chances

ANSWER

Name a disease that is found both in human and animal?(short)

Posted by Anuj Chourasia 4 years ago

CBSE > Class 08 > Science

2 answers

Zibiah Gonsalves 4 years ago

Anthrax

Jahnavi Janu 4 years ago

1.Corona viruses 2.Cat scratch disease 3.Histoplasmosis

ANSWER

Name any three disease spread by bacteria and virus in human ?

Posted by Anuj Chourasia 4 years ago

CBSE > Class 08 > Science

2 answers

Gaurav Seth 4 years ago

Bacteria

They are very small,single-celled micro-organism which have cell wall but do not have an organises nucleus and other structures.

For Example:Lactobacillus,Rhizobium.

Some of the diseases cause by bacteria are cholera,typhoid,tuberculosis,diphtheria etc.

Viruses

They are the smallest micro-organism which can develop only inside the cells of the host organism .

Viruses can reproduce and multiply only inside the cells of other organism .They are the agents of diseases.

The diseases caused by virus are common cold, influenza,measles,polio,chicken pox,small pox etc.

For Example:HIV(Human Immuno deficiency) virus causes AIDS, Common cold virus, Corona (COVID-19)