CBSE > Class 09 > Science | CBSE Board | Homework Help

Cells are the basic, fundamental unit of life. So, if we were to break apart an organism to the cellular level, the smallest independent component that we would find would be the cell.

Based on cellular structure, there are two types of cells:

Prokaryotes
Eukaryotes

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Khushi Verma Verma 4 years, 6 months ago

From which topic

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Convert on Kelvin scale of 37°C

Posted by Saniya... Singh... 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Pinak Ranjan Panigrahi 4 years, 6 months ago

37°c + 273 k = 300° k

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Sponge though comprssible , is a solid

Posted by Raman Sandhu 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 6 months ago

The sponge is compressible being a solid because of the presence of air cavities inside it. The sponge has numerous pores in it which can be referred to as air cavities, in which air is trapped and on compressing it comes out of the sponge. These pores are the reason why sponge can easily soak liquid into it.

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Why time is different in different countries

Posted by Jiten Singh 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Khushi Verma Verma 4 years, 6 months ago

if we have a single time zone on the earth known would be in middle of the day but in some places but it will be morning, evening and the middle night is other .since different time we need different timezone so that reason time is different in different countries

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What is a light

Posted by Hypeŕ Gameŕ 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Jiten Singh 4 years, 6 months ago

Light is a electromagnetic waves which has ability to do works

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Khushi Verma Verma 4 years, 6 months ago

light is a form of energy which help us to see it does not require any medium of propagate it is speed is faster than any other form of energy

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Praveen Kumar 4 years, 6 months ago

Light is a form of electromagnetic radiation with a wavelength.

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Define pvt

Posted by Naveen Raj 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Praveen Kumar 4 years, 6 months ago

Portal Vein Thrombosis is a blood clot of the portal vein, also known as the hepatic portal vein.

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When sugar and common salt are kept in different jars they take the shape of the jars.Are they solid?Justify your answer

Posted by Aditya Jee 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Panchadev Yadav 4 years, 6 months ago

No they are not solid as indivisible crystals of the sugar do not change their shape

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Shailendra Singh 4 years, 6 months ago

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This question in motion chapter. an object has moved through a distence.can it yes support your answer with an example

Posted by Yash Kumar Sinha Sinha 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Khushi Verma Verma 4 years, 6 months ago

yes the object instead of moving through a distance can have zero displacement example if an object travel from point A and reaches to the same point A then its displacement is zero

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The outer membrane found in an animal cell is

Posted by Diviyanshu Yadav 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Sanjay Sahani 4 years, 5 months ago

Plasma membrane or cell membrane

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Jiten Singh 4 years, 6 months ago

Plasma membrane or cell membrane or plamalemla

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Riddhima Mishra 4 years, 6 months ago

Plasma membrane

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Ankit Mishra 4 years, 6 months ago

Plasma

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Debasmita Deb 4 years, 6 months ago

Plasma membrane

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The process of dash causes cooling

Posted by Iqra Kapasiyawala 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Love Grewal 4 years, 6 months ago

Evaporation

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The rate of change of velocity is called _______

Posted by Sahana Pasupathy 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

B. Gowtham 4 years, 6 months ago

Acceleration

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Shakti Chaturvedi 4 years, 6 months ago

Acceleration

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D/b uniform and non uniform motion

Posted by Akshit Masta 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Fear Fighter 4 years, 6 months ago

Acceleration exists in non uniform motion while acceleration in uniform motion is equal to zero

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Gagana Shree 4 years, 6 months ago

An object is set to be undergoing uniform motion if it covers equal distance in equal intervals of time . It is an object covers unequal distance in un equal intervals of time then it is undergoing non uniform motion

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What do you mean by displacement of a object

Posted by Supreet Samal 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Shakti Chaturvedi 4 years, 6 months ago

The least distance between the initial position & final position is called displacement

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? ????? ?????? ? 4 years, 6 months ago

Shortest distance is displacement....

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What are substance that react in a chemical reaction called?

Posted by Skarma Angmo 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

? ????? ?????? ? 4 years, 6 months ago

Reactant....

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Which of the following are matter? Chair,air,love,smell,hate,almonds, thought,cold,cold drink and smell of perfume

Posted by Uday Meena 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Tanuj Kumar 4 years, 6 months ago

Anything that occupies space and has mass is called mattet. Matter can exist in three physical state - solid , liquid and gas . Chair and almonds are solid state of matter . Cold drinks is liquid state of matter. Air and smell of perfume are gaseous states of matter.

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What are different types of temperature scale write a relation among them

Posted by Tanuj Kumar 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

Celsius and Kelvin are two scales used to measure temperature. Both follow the same unit difference between each scale but with different starting points. The relation between Celsius and Kelvin are as follows-

Celsius to Kelvin

K = D+273

Where,

K is the temperature in Kelvin scale.

D is the temperature in Celsius scale.

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Flowchart of physical and chemical classification of matter

Posted by Shoshil S K Singh 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 6 months ago

On the basis of physical state, matter is classified into three categories, such as solid, liquid and gas. Matter basically exists in three physical states and these states are used to classify them in the physical form. Matter is distinguished into solid, liquid or gas by the arrangement of the atoms in the mater. While a chemical property is revealed only by the behavior of a substance in a chemical reaction, a physical property can be observed and measured without changing the composition of a sample. Physical properties include color, pressure, length, and concentration.

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What is chromatography and its application

Posted by Riya Yadav 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

Chromatography is the technique used for separation of those solutes that dissolve in the same solvent.
To understand how this technique can be used let us perform an activity.
Take a thin strip of filter paper. Draw a line on it using a pencil, approximately 3 cm above the lower edge as shown in figure(a). Put a small drop of ink (water soluble, that is, from a sketch pen or fountain pen) at the centre of the line. Let it dry. Lower the filter paper into a jar/glass/ beaker/test tube containing water so that the drop of ink on the paper is just above the water level, as shown in Fig(b) and leave it undisturbed.

Applications of Chromatography
To separate
• colours in a dye
• pigments from natural colours
• drugs from blood.

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The plasma was different from solide, liquid, gases. Explain it?

Posted by Arvind Kumar 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

Solid

In solids, particles are tightly or closely packed.
The gaps between the particles are tiny and hence it is tough to compress them.
Solid has a fixed shape and volume.
Due to its rigid nature, particles in solid can only vibrate about their mean position and cannot move.
Force of attraction between particles is adamant.
The rate of diffusion in solids is very low.
An example of solids: solid ice, sugar, rock, wood, etc.

Liquid

In a liquid state of matter, particles are less tightly packed as compared to solids.
Liquids take the shape of the container in which they are kept.
Liquids are difficult to compress as particles have less space between them to move.
Liquids have fixed volume but no fixed shape.
The rate of diffusion in liquids is higher than that of solids.
Force of attraction between the particles is weak than solids.
Example of a liquid state of matter: water, milk, blood, coffee, etc.

Gas

In gases, particles are far apart from each other.
Force of attraction between the particles is negligible and they can move freely.
Gases have neither a fixed volume nor a fixed shape.
The gaseous state has the highest compressibility as compared to solids and liquids.
The rate is diffusion is higher than solids and liquids.
The kinetic energy of particles is higher than in solids and liquids.
An example of gases: air, helium, nitrogen, oxygen, carbon dioxide, etc.

Plasma

Plasma is a not so generally seen form of matter. Plasma consists of particles with extremely high kinetic energy. Electricity is used to ionize noble gases and make glowing signs, which is essentially plasma.
Superheated forms of plasma are what stars are.

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Characteristics of particles of matter??

Posted by Prince Yadav 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

The important characteristics of particles of matter are the following:

The particles of matter are very, very small.
The particles of matter have space between them.
The particles of matter are constantly moving.
The particles of matter attract each other.

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ANSWER

Why saturn,s dense is less than water

Posted by Roopa A S 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

Saturn is very large and is the second largest planet in the Solar System. However, it is made up mostly of gas and is less dense than water. Since it is lighter than water, it can float on water. None of the other planets in our Solar System can do this because they have a higher density than water.

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Initially a body of mass 'm' is moving with 'v' velocity if by applying force if its velocity if by applying force if its velocity becomes one-third of initial then the ratio of old and new momentum is.

Posted by Satyanshu Shivam 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Fear Fighter 4 years, 6 months ago

3:1

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Can the displacement of a particle is zero while distance travelled is not zero

Posted by Khushi Verma Verma 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

Yes, the displacement can be zero if the particle returns to its starting point.

If a body starts from some point, say A, goes in a circle and comes back to point A, then the displacement as defined will be zero. Because the initial and final points will be same and there will be zero distance between them. But in the same case distance will not be zero and will be given by the length of actual path traveled by body.
Hence, displacement can be zero, even if distance covered is non-zero.

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Which state of matter have high force of attraction

Posted by Alok Sharma 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Jiten Singh 4 years, 6 months ago

Solid

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Yogita Ingle 4 years, 6 months ago

A matter exists in solid state because of greatest force of attraction between its particles which makes the particles closely packed.

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Show that the particles of matter are too small with an activity .

Posted by Lekhana Abburi 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Khushi Verma Verma 4 years, 6 months ago

take a container fill it with water at salt to it and let it rest after some you will see that salt has broken into small particles and dissolve in the water show that particle of matter are very small

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How can the loss of top soil be prevented

Posted by Navpreet Kaur 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Khushi Verma Verma 4 years, 6 months ago

By planting more trees Explanation as we plant more trees we can control the effect of soil erosion as a root of the tree being the soil together and hence we can prevent the loss of topsoil

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give reason for the following observation the smell of hot sizzling food reaches you several metres away but to get the smell from cold food you have to go close

Posted by Mithunswami E Kembhavimath 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close because the kinetic energy of the particles of matter increases with the increase in temperature.

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Air is matter

Posted by Anita Chouhan 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Jiten Singh 4 years, 6 months ago

Yes, because when we keep air in balloon it also take place

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Meghna Thapar 4 years, 6 months ago

Air is matter because it is a gas composed mostly of nitrogen, oxygen, and argon, and gases do have mass because they're molecules bouncing around a contained volume (here, the atmosphere). Water vapor, mixed in to some extent with air, is also a gas and therefore has mass.

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what is the course of science till half yearly which chapters are coming

Posted by Rishika Tiwari 4 years, 6 months ago

CBSE > Class 09 > Science