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

Time lapse refers to a shot that follows a transition in time like an entire l Sunset in a matter of seconds or the flowering of a plant in under a minute

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Tisuee is made of how many cells

Posted by Pushap Thakur 5 years ago

CBSE > Class 09 > Science

5 answers

Shivani Singh 5 years ago

Many cells

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Birdeep Gumber 5 years ago

420

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Anju Arya 5 years ago

tissues are group of many cells performing a specific function

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Shaik Mehwish 5 years ago

200 in human body

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Kajol Bishnoi 5 years ago

Not fix

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1.) What are vascular bundle 2.) How do cork act as protective tissue

Posted by Manya Puri 5 years ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 10 months ago

Xylem and phloem makes vascular bundle. As the plant grows older, the outer protective tissue, epidermis undergoes certain changes. A strip of secondary meristem, called phellogen or cork cambium replaces epidermis of stem. Cells on the outside are cut off from this layer. This forms the several-layer thick cork or the bark of the tree. Cells of cork are dead and compactly arranged without intercellular spaces. They also have a chemical called suberin in their walls that makes them impervious to gases and water.

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If a bullet fire from a gun, the gun adjust the force on the gunman backward ?

Posted by Chitralekha Khaund 5 years ago

CBSE > Class 09 > Science

2 answers

Swayam Shah 5 years ago

Yes ut is called recoil of gun

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Himanshu Singh 5 years ago

Yes because it is a Newton third law of action and reaction

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Distinquish between speed and velocity

Posted by Devika P. V 5 years ago

CBSE > Class 09 > Science

3 answers

Anju Arya 5 years ago

speed is a scalar quantity where as velocity is a vector quantity. speed is a fast movement where as velocity is rate of change of speed but they both are measured in meters per second or their SI Unit is same that is meter per second

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Satish Lovewanshi 5 years ago

I love you

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Kritika Singh 5 years ago

Speed - is scalar quantity It doesn't follow vector rule of addition Only positive No direction Velocity- it is vector Follow vector rule of addition Negative and positive Direction mentioned These are basic ...you can search on physic book if higher classes for more

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why is the weight of an object on the moon one sixth iths weight on the Earth?

Posted by Karnica Agrawal 5 years ago

CBSE > Class 09 > Science

5 answers

Swayam Shah 5 years ago

Due to acellaration of gravity(g) which 9.8N on earth which id directly propotional to mass of planet or celestial body so moon has less mass (newtons 2nd law)

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Himanshu Singh 5 years ago

Due to the gravitational force it has less gravitational force than earth

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Satish Lovewanshi 5 years ago

Kritika sing I Love you

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Kritika Singh 5 years ago

Ratio*

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Kritika Singh 5 years ago

Due to the gravity due to acceleration acting on it ..as mass of moon is lesser as compared to that of earth ..the g also decrease ..by ration it turns out to be that a object of 6 kg in earth =1 kg on moon

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What is bes

Posted by V S 5 years ago

CBSE > Class 09 > Science

1 answers

Srushti Khadtare Khadtare 5 years ago

Bes (/ˈbɛs/; also spelled as Bisu), together with his feminine counterpart Beset, is an ancient Egyptian deity worshipped as a protector of households and, in particular, of mothers, children and childbirth. ... Bes later came to be regarded as the defender of everything good and the enemy of all that is bad.

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What is the definition of Free fall?

Posted by Gulshan Sinku 5 years ago

CBSE > Class 09 > Science

2 answers

Swayam Shah 5 years ago

When an object falls only under the influence of gravitational force alone is called free fall which is not possible in day to day life because friction and air resistance act on object falling

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Srushti Khadtare Khadtare 5 years ago

downward movement under the force of gravity only.

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Can anyone please send me the step-by-step answer for table 10.1 in physics chapter -10 (gravitation )

Posted by S . Maha Gowri 5 years ago

CBSE > Class 09 > Science

4 answers

Shivani Singh 5 years ago

????

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Kiran Saraswat 5 years ago

???

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Aditya Rathod 5 years ago

Nah!

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Ankan Karmakar 5 years ago

Good

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Please link the previous year papers for tissues

Posted by Pranavi Joshi 5 years ago

CBSE > Class 09 > Science

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Q : Difference between immediate and contributory causes of diseases.

Posted by Riddhi Ahuja 5 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 5 years ago

Immediate Causes
1. Factors which are directly responsible for a particular disease are called immediate causes.
2. Example: Pathogens such as virus, bacteria, fungi, etc.

Contributory Causes

1. Factors which provide favourable conditions which make pathogens invasion easy are called contributory causes.

2. Example: poor nourishment, unhygienic environment, pollutants, etc.

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please explain the numericals of physics of chapter motion and force and laws of motion with some random examples

Posted by Pranavi Joshi 5 years ago

CBSE > Class 09 > Science

1 answers

Swayam Shah 5 years ago

Seee

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Explain endoplasmic reticulum in simple and understandable words

Posted by Pranavi Joshi 5 years ago

CBSE > Class 09 > Science

5 answers

Pranavi Joshi 5 years ago

Thanks kuldeep ??

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Pranavi Joshi 5 years ago

Thanx alot kuldip??

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Kritika Singh 5 years ago

Endoplasmic reticulum is a organelle of a cell that helps to connect cytoplasm with nucleus..which is necessary to transfer thing ( basically mineral ,food , oxygen etc) This is a easy to learn definition .. functions not included along with external information

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Pranavi Joshi 5 years ago

Kuldeep Malik Thanks for ur answer but u have explained rough endoplasmic reticulum in more detail I only want endoplasmic reticulum

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Kuldeep Malik 5 years ago

Endoplasmic reticulum A network of tubes for transportation of substances It is called rough because of presence of ribosomes on surface of tubes and it look rough Ribosomes are manufacturer of protein and er are known for manufacturation of protein Refer to ncert book for more information

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Please explain the process of ATP(Adenosine Triphosphate) And why is it necessary???

Posted by Pranavi Joshi 5 years ago

CBSE > Class 09 > Science

2 answers

Pranavi Joshi 5 years ago

Ohk thanx vishwas verma But do u know the explanation If yes please tell

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Vishwas Verma. 9681 5 years ago

I necessary because it's the energy currency of a cell

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Where are gens located

Posted by Pinki Patel 5 years ago

CBSE > Class 09 > Science

5 answers

Bharti Garg 5 years ago

Chromosome

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Divya Gupta 5 years ago

Genes are located at chromosomes in nucleus

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Aditya Rathod 5 years ago

In the cell in our body in our nucleus in our chromosomes so what do u want now ???

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Pranavi Joshi 5 years ago

Firstly it's not gens it's genes and they're located on the thread like structures called chromosomes which are located inside the nucleus if a cell

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Mohd Faisal 5 years ago

Gene located at Chromosomes in Nucleus

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Can anyone please send me the step-by-step answer for table 10.1 in physics

Posted by S . Maha Gowri 5 years ago

CBSE > Class 09 > Science

2 answers

S . Maha Gowri 5 years ago

Gravitation (chapter-10)

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Kalpnaagrawal Kalpnaagrawal 5 years ago

Which chapter?

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Why exercise essential for good health? Please give right answer

Posted by Sandip Mondal 5 years ago

CBSE > Class 09 > Science

1 answers

*Suhana * 5 years ago

1) It improves the ability to work and gives strength to the body. ( The person having good health get the jobs easier because they can work faster and more as compare to others.) 2)It is good because it freshes our mind.( Fresh mind is able to get more knowledge). 3) If we have some phisical problem like stress and head ache, etc. it improves much pain then to take medicines.

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Define air

Posted by Rani Barman 5 years ago

CBSE > Class 09 > Science

3 answers

Shivani Singh 5 years ago

The mixture of gases that surrounds the earth and that people animals and plant's breathe.

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Pranavi Joshi 5 years ago

Air is a heterogeneous mixture of gases which includes oxygen which we need to breath It's a non-uniform composition and consist two or more phases

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Dhiraj Singh 5 years ago

Air is the mixture of gases.

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What is newton first law?

Posted by Khevish Bhardwaj 5 years ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 5 years ago

Newton’s First Law of Motion:

Any object remains in the state of rest or in uniform motion along a straight line, until it is compelled to change the state by applying external force.

Explanation: If any object is in the state of rest, then it will remain in rest untill a exernal force is applied to change its state. Similarly an object will remain in motion untill any exeternal force is applied over it to change its state. This means all objects resist to in changing their state. The state of any object can be changed by applying external forces only.

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Which is not mixture

Posted by Dhrumal Solanki 5 years ago

CBSE > Class 09 > Science

1 answers

Lobsang Choewang 5 years ago

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The material which makes a body is called ____.

Posted by Prachi Garg 5 years ago

CBSE > Class 09 > Science

2 answers

Pranavi Joshi 5 years ago

Cell makes tissues ; tissues makes organ ; organ makes an organ system and so is our body

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Mohd Faisal 5 years ago

Cell

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IF the velocity of the body is reducing It is said to have

Posted by Dhrumal Solanki 5 years ago

CBSE > Class 09 > Science

2 answers

Dhrumal Solanki 5 years ago

Name a lastrous non metal s

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Dhrumal Solanki 5 years ago

IF the velocity of the body is reducing it is said to have

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Working of fractional distillation

Posted by Karanpreet Karan 5 years ago

CBSE > Class 09 > Science

1 answers

Manya Puri 5 years ago

mixture into its component parts, or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate. Generally the component parts have boiling points that differ by less than 25 °C (45 °F) from each other under a pressure of one atmosphere. If the difference in boiling points is greater than 25 °C, a simple distillation is typically used.

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What is difference between homogeneous and hetrogeneous

Posted by Ekta Ekta 5 years ago

CBSE > Class 09 > Science

3 answers

Pranavi Joshi 5 years ago

Homogeneous mixture has a single phase while heterogeneous has 2 or more Homogeneous is a uniform composition while heterogeneous is a non uniform composition Sugar and water solution is an example of homogeneous mixture Salt and air Or sand and water is an example of heterogeneous mixture

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Jagjeet Kaur 5 years ago

Homogeneous is that in which both the substances can mix properly like sugar in water and heterogeneous is that in which both substances cannot mix properly like soil in water

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Tanya Tanya 5 years ago

A homogeneous mixture is a solid , liquid or gaseous mixture that has the same proportions of its components through out any given sample. Conversely, a *heterogeneous* mixture has component in which proportions vary through out the sample.

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Science ke notes hai kya hindi ?

Posted by Aman Mishra 5 years ago

CBSE > Class 09 > Science

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Function of mitrocondriya ?

Posted by Aman Mishra 5 years ago

CBSE > Class 09 > Science

5 answers

Pranavi Joshi 5 years ago

Mitochondria is covered by a double membrane. Outer membrane is highly porous while inner membrane has a lots of folds These folds create a large surface area for ATP {Adenosine Triphosphate (it's a molecule synthesis)}. ATP is the energy currency of cell and this process takes place in mitochondria Hence it's called as "the power house " of a cell

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Tanya Tanya 5 years ago

It is the powerhouse of cell and the functions of mitrocondriya are :- Apoptosis Mitophagy ROS production ATP supply through OXPHOS

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Sriya? Ghosh 5 years ago

Also it produces the energy currency called ATP (Adenosine Tri phosphate)

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Shirish Patil 5 years ago

Mitocondria is referred to as the powerhouses of cells, it play a vital role in the conversion of energy from food into energy.

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Angad Bhati 5 years ago

it is the power house of cell