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

His contributions are - *His discoveries of principal of vaccination, microbial fermentation, and pasteurization. *Pasture developed practices that are still used today as - for preventing desiases in silkworm, using his germ theory of disease , he invented vaccines for chickens , cholera , anthrax , and rabies.

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English determiners is not there

Posted by Bhakti Jugani 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gurleen Kaaur 4 years, 1 month ago

It's very easy . If there is a problem then u can ask from ur teacher or from you tube everything is possible

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Difference between Gravity and Gravitational?

Posted by Utkarsh Dhiman 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Hdm . 4 years, 1 month ago

Gravity is noun and gravitational is adjective. *Both means to the same thing*

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Yogita Ingle 4 years, 1 month ago

Gravitation is the attractive force existing between any two objects that have mass. The force of gravitation pulls objects together. Gravity is the gravitational force that occurs between the earth and other bodies. Gravity is the force acting to pull objects toward the earth.

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Manisha Kumari 4 years, 1 month ago

2x+3x

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What is the definition of solid

Posted by Akib Khan 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Pragati Agrawal 4 years, 1 month ago

A state of matter which have both fixed shape as well as volume also..

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Bhumika Sharma ✓ 4 years, 1 month ago

A solid is a state of matter characterized by particles arranged such that their shape and volume are relatively stable.......... A solid is one of the four fundamental states of matter along with liquids, gases , and plasma. Feeling good to help you ?.

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Yogita Ingle 4 years, 1 month ago

Solid: Matters which have fixed volume and shape are called solids. For example - stone, wood, brick, ice, sugar, salt, coal, etc. All metals are solid except mercury and gallium.

Properties of solids

Solid has fixed volume.
Solid has fixed shape.
Solid has high density.
Solids are heavy.
Solid does not flow.

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Distinguish between solid, liquid and gas in tabular form

Posted by Akash Patil 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 1 month ago

Differences between solid, liquid and gas.

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The odometer of a car reafs

Posted by Syed Ezan 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Prag Rawat 4 years, 1 month ago

Distance Speedometer speed

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Mannat Thukral 4 years, 1 month ago

The odometer of a car measures the distance travelled by the car The SI unit of distance is m/s

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Vishal Bansal 4 years, 1 month ago

Distance travelled

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Aashish Kumar 4 years, 1 month ago

Distance traveled

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Discuss in brief Rutherford model of atom

Posted by Deepanshi Kaushik 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Deepanshi Kaushik 4 years, 1 month ago

Thanku for this lovely answer

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Yogita Ingle 4 years, 1 month ago

Thomson’s model revealed that atom has spherical structure, with positive charge spread all over the sphere and electrons are embedded in it. Also there is equal number of positive and negative charge i.e. atom is electrically neutral.

Ernest Rutherford carried out experiments by taking consideration in Thomson’s model and presented more accurate model i.e. Rutherford’s model. Rutherford bombarded ⍺ particles i.e. He2+ ions on gold foil. Gold foil has very thin thickness of about 1000 atoms thick. Observations of Rutherford’s experiment are
- Most of ⍺ particles passes through gold foil
- Some ⍺ particles get deflected with very small angles from their path
- Very few i.e. 1/ 12000 were reflected back on same path

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What is friction what react its in our daily life???

Posted by Palak Pandey 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 1 month ago

Friction is the force that resists motion when the surface of one object comes in contact with the surface of another. It is also defined as the resistance offered by the surfaces that are in contact with each other when they move over each other.

We see friction in our day to day activities. Following are the ten examples of friction in daily life:

Walking –It is impossible to walk on the ground without friction. Friction is what holds your shoe to the ground. The friction present on the ice is very little, this is the reason why it is hard to walk on the slippery surface of the ice.
Writing – A frictional force is created when the tip of the pen comes in contact with the surface of the paper. Rolling friction is what comes into play while writing with a ballpoint pen while sliding friction arises when one writes with a pencil.
Skating – A thin film of water under the blade is necessary to make the skate slide. The heat generated by the skate blade rubbing against the surface of ice causes some of the ice to melt right below the blade where the skater glides over the ice. This water acts as a lubricant reducing friction.
Lighting a matchstick – When the head of the matchstick is rubbed against a rough surface, heat is generated and this heat converts red phosphorous to white phosphorous. White phosphorous is highly inflammable and the match stick ignites. Sometimes, matchsticks fail to ignite due to the presence of water. Water lowers friction.

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Differentiate between Parenchyma, Collenchyma and Sclerenchyma on the basis of their cell Wall ?

Posted by Sakshi Kumari 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Virendra Kumar Singh 4 years, 1 month ago

Parenchyma had thin cell wals so they are loosly packed and intracellular space present on them Collenchyma the cell wall of this tissue is very soft so it helps in the flexibility of plants. Ex.tendrils Sclerenchyma tissue is very hard and stiff which gives the mechanical support to plants.

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Sakshi Kumari 4 years, 1 month ago

Parenchyma has a thin cell wall of their cells, and are made up of cellulose. Whereas collenchyma cells have an uneven cell wall made up of pectin and hemicellulose. There is a hard and thick cell wall present of the sclerenchyma cells, which is made up of the lignin.

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Sakshi Kumari 4 years, 1 month ago

Parenchyma: The cells of parenchyma have thin walls made of cellulose Collenchyma: The cells of this tissue have cell walls thickened at the corners due to cellulose deposition Sclerenchyma: The walls of sclerenchymotous cells are thinkened due to lignin deposition.

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What are vachale?What are the substance stored in it?

Posted by Shubham Sonu 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sakshi Kumari 4 years, 1 month ago

The substances that are present inside a vacuole are water, enzymes, organic acids and carbohydrate molecules. Vacuoles store amino acid, sugars, various organic acids and some potiens.

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What are bachate?What are the substance stored in it?

Posted by Shubham Sonu 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Shubham Sonu 4 years, 1 month ago

Vacuoles lekha hai

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Name the two types of plastids found in plant cell and also write their function.

Posted by Shubham Sonu 4 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Deepanshi Sharma 4 years, 1 month ago

What is commission report in brief

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Shivani Sinha 4 years, 1 month ago

Cloroplast & chromoplast

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Divya Gupta 4 years, 1 month ago

Chromoplast and leucoplast

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Shubham Sonu 4 years, 1 month ago

And their function.

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Rakshit Jain 4 years, 1 month ago

Chromoplast and leucoplast

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WHAT IS HOMOGENEOUS?

Posted by Daksh Mittal 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Poonam Anand 4 years, 1 month ago

Homogeneous is a mixture they can be mixed them properly

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Virendra Kumar Singh 4 years, 1 month ago

Homogeneous is a mixture in which particles are uniformly distributed . It is also known as the solution.ex......sugar +water

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Vahi Vahi 4 years, 1 month ago

The mixture that can mix completely and appear in one form is called homogeneous mixture..ex-..sugar water, salt water

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Yogita Ingle 4 years, 1 month ago

Mixtures which have uniform composition throughout are called Homogeneous Mixture. For example – mixture of salt and water, mixture of sugar and water, air, lemonade, soda water, etc.

Mixture of salt in water is an example of homogeneous mixture. In this mixture, the boundary of salt and water cannot be differentiated. When a ray of light is passed through the mixture of salt and water, the path of light is not seen.

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Capter 4

Posted by Sundri Devi Sundri Devi 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Sandeya Kazal Chettri 4 years, 1 month ago

Structure of atom

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Palak Pandey 4 years, 1 month ago

Structure of atom???

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Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert

Posted by Astha Prashar 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 1 month ago

Particles of air have large spaces between them. On the other hand, wood has little space between its particles. Also, it is rigid. For this reason, we can easily move our hands in air, but to do the same through a solid block of wood, we need a karate expert.

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What is connective tissue??

Posted by Navya Navya 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Sakshi Kumari 4 years, 1 month ago

It protects and supports the body. The cells are loosely spaced and embedded in an intercellular matrix.

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Bhumika Sharma ✓ 4 years, 1 month ago

Tissue that supports, protects, and gives structure to other tissues and organs in the body .

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Tannu Gupta 4 years, 1 month ago

Connective tissue helps in binding , supporting , protecting ,transporting substances in the body . There are three types of connective tissues : loose connective tissue ,areolar connective tissue,reticular tissue . It is made up of three main components cells ,protein fibre,extracellular matrix .

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Divya Gupta 4 years, 1 month ago

Tissues that supports,protects and give structure to other tissue and organ called connective tissue. It is made up of cells,fibres and gel like substance

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What is the meaning of jk

Posted by Karan Patel 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Мυѕкαи ? 4 years, 1 month ago

Okay now I am serious jk exactly means just kidding

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Мυѕкαи ? 4 years, 1 month ago

Jung kung?of bts

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Sandeya Kazal Chettri 4 years, 1 month ago

I dont know but u know the meaning of jk

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What is the period mensuration period in girls

Posted by Sarthak Gore 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Vaibhav Kumar 4 years, 1 month ago

1 months after mature?

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Vaibhav Kumar 4 years, 1 month ago

4 to 6 months

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Akhil Sharma 4 years, 1 month ago

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Heterogeneous mixture have fixed composition . True or false?

Posted by Harsh Snehal Lokhande 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Sandeya Kazal Chettri 4 years, 1 month ago

Its true

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Aayushi Rawat 4 years, 1 month ago

True

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Kumar Mukul 4 years, 1 month ago

True

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Usman Sharif X-A 4 years, 1 month ago

True

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PDF on food resources and aquatic species of Telangana

Posted by Pragya Punyani 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Vaibhav Kumar 4 years, 1 month ago

Yes both are right I am only use this app for checking my knowledge to answer the questions

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Ash Greninja 4 years, 1 month ago

Neha malhotra is right?

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Neha Malhotra 4 years, 1 month ago

Check it on google instead of wasting time on this app

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A horse and a mango tree both are complex living organisms with specialised yet different tissues to perform the basic life process.give two reasons for possessing different tissues.

Posted by Kartik Bhardwaj 4 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is cell division and why is it necessary

Posted by M. Hoysala 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Aayushi Rawat 4 years, 1 month ago

Cell division the process by which new cells are made is cell division . There are two type of cell division mitosis and meiosis

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M. Hoysala 4 years, 1 month ago

Cell Division, Mitosis and Meiosis. There are many reasons for the division of cells as cells divide to replace old, dead or damaged cells. Cells divide so that living things can grow. Organisms grow not because cells are getting larger but because cells are dividing to produce more and more cells.

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Differentiate between cardiac muscle, smooth muscle, striated muscle.

Posted by Shraddha Namplle 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 4 years, 1 month ago

1) Skeletal muscles: It is a form of striated muscle tissue, which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibres known as tendons.

2) Smooth muscle: Smooth muscle generally forms the supporting tissue of blood vessels and hollow internal organs, such as the stomach, intestine, and bladder.

3) Cardiac muscle: The cardiac muscle function has a movement of contraction, which moves the blood into the heart and the circulatory system that goes throughout the body. The cardiac muscle function is important because it keeps the blood flowing within the heart so that it can continue to pump.

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Harshit Kumar 4 years, 1 month ago

Cardiac muscle:- (i)

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