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

At room temperature (anywhere from zero degree centigrade to 100 degrees centigrade), water is found in a liquid state. This is because of the tiny, weak hydrogen bonds which, in their billions, hold water molecules together for small fractions of a second. Water molecules are constantly on the move.

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An iron almirah is solid at room temperature

Posted by Saransh Tandon 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Ayush Tyagi 4 years, 5 months ago

Sorry rigid at room temperature and

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Ayush Tyagi 4 years, 5 months ago

Almirah is solid at room temperature because it do not flow at room temperature and id-id attack room temperature

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Describe the role played by the lysosomes in the cell. Why are these termed as suicidal bag ? How do the perform their function?

Posted by R R 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

Lysosomes are the digestive organelle of of the the cell They are known as suicidal bags because when the cell disturbed they may burst and their strong digestive enzymes digest its on cell

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name any two substance which sublime

Posted by Amar Singh 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Ayush Tyagi 4 years, 5 months ago

Camphor called Kapoor and ammonium chloride

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Yogita Ingle 4 years, 5 months ago

Sublimation is the process in which solid turns directly into gas without converting into liquid.
The substances undergoing sublimation are termed as sublimates.

            Heating
Solid <=========> Gas

Examples :

Ammonium Chloride is white solid on heating it sublimes.

Iodine .

Dry ice.

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Differences between suspension and colloidal

Posted by Debjani Karan 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 5 months ago

<th> </th> <th>Suspensions</th> <th>Colloids</th>

Appearance	Cloudy, heterogeneous, at least two substances visible	Cloudy but uniform and homogeneous
Particle Size	larger than 10,000 Angstroms	10-1000 Angstroms
Effect of Light (Tyndall Effect)	variable	light is dispersed by colloidal particles
Effect of Sedimentation	particles will eventually settle out	none

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What would happen if the plasma membrabe ruptures breaks down

Posted by Khushi Maheshwari 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

If it happens so then all the plasma from the cell moves out and lysosomes burst cause its digestive enzymes digest its own cell

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Chapter5 all questions

Posted by Khushi Maheshwari 4 years, 5 months ago

CBSE > Class 09 > Science

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Convert the following temperature to the Celsius scale 393k

Posted by Rishu Kaushal 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

120

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Why water at room temperature is in liquid state

Posted by Aditi Sinha 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 5 months ago

At room temperature (25°C), water is a liquid because it has the following characteristics of liquid:

At room temperature, water has no shape but has a fixed volume i.e., it occupies the shape of the container in which it is kept.
At room temperature, water flows easily.

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What is cell explain its function

Posted by Kamlesh Kothari 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 5 months ago

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.

A cell performs these major functions essential for the growth and development of an organism. Important functions of cell are as follows:

All the organisms are made up of cells. They form the structural basis of all the organisms. The cell wall and the cell membrane are the main components that function to provide support and structure to the organism. For eg., the skin is made up of a large number of cells. Xylem present in the vascular plants is made of cells that provide structural support to the plants.
In the process of mitosis, the parent cell divides into the daughter cells. Thus, the cells multiply and facilitate the growth in an organism.
Cells require energy to carry out various chemical processes. This energy is produced by the cells through a process called photosynthesis in plants and respiration in animals.

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Why it is difficult to make antivirus then antibiotic

Posted by Ayush Tyagi 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 5 months ago

It is difficult to make antiviral medicines than making antibiotics because viruses have few biochemical mechanisms of their own. They enter the host cells and use their machinery for their life processes. So, antiviral medicines will work against the host body. Antibiotics block bacterial synthesis pathways without affecting the body because bacteria use its own metabolic pathway machinery so, it will not affect the host body.

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What is velocity e

Posted by Jagdeep Kaur 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

Velocity is displacement upon time it has its direction so it's a vector quantity

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How does evaporation shows coolinng effect

Posted by Rajanish Kumar 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 4 years, 5 months ago

Evaporation causes cooling. This is based on the fact that when a liquid evaporates, it takes (or draws) the latent heat of vaporization from "another matter" which it touches. This "another mater looses" heat and gets cooled. This is how evaporation causes cooling.
E.g.- When perfume falls on our hand, our hand feels cool because perfume is a volatile liquid and gets evaporated rapidly taking away the latent heat of vaporization from our hand.

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Ayush Tyagi 4 years, 5 months ago

When evaporation take place water take all the heat from call surrounding and evaporate which cause cooling

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Why do we see water droplets on the surface of a glass containing ice cream water?

Posted by Anshika Mashi 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

Because the glass will become very cool and water vapours in surrounding get liquify cause water droplet in the surface of water class

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Why we can't eat some plants?

Posted by Koushik Gogoi Gg 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

Because they may contain any poison harmful substance which are harmful for health or they are unfit to eat that's why

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What is hybridization ,what are its uses

Posted by Shreya Thakur 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

The crossing of two breeds to make a new and a good breed is known as hybridization 2. It was a new breed with very different qualities of their parents The new breed is better than previous two breeds

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Why a solution can't to be separated

Posted by Arup Mondal 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

It can be separated but the method of separating that solution is very difficult because the particles of that solution are very small all and mix completely that's why it is is very difficult to filter them or separate them

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Explain carbon cycle in its own words in maximum marks 5

Posted by Yash Soni 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 5 months ago

Carbon is found elemental form as well as combined form on the Earth.
In combined state it is present as carbon dioxide in the atmosphere, as carbonate and hydrogen-carbonate salts in various minerals and as life molecules.
It is through photosynthesis (carried out by life-forms containing chlorophyll) that carbon gets incorporated into life-forms. Photosynthesis converts carbon dioxide (from the atmosphere or dissolved in water) to glucose in the presence of sunlight by all life-forms that contain chlorophyll. These glucose molecules are either converted into other substances or used to provide energy to the organism for carrying out its life processes or building other molecules.

Energy is provided through the process of respiration, which converts glucose back into carbon dioxide. In addition, combustion of fuels to provide energy for various needs like heating, cooking, transportation and industrial processes also releases carbon dioxide to atmosphere. Today the percentage of carbon dioxide in the atmosphere has doubled since the industrial revolution. Thus carbon is cycled repeatedly through different forms by the various physical and biological activities.

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Which is the best reference books for science class 9th

Posted by Himanshu Kumar 4 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Arti Yadav 4 years, 5 months ago

The best book is s chand

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Mansi Class12 4 years, 5 months ago

According to me lakhbir singh and pradeep are best

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Satwik Singh 4 years, 5 months ago

M.c

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Ayush Tyagi 4 years, 5 months ago

According to me lakhmir Singh

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Why we can't drive 4th equation of motion by using graphical method

Posted by Prakash S 4 years, 5 months ago

CBSE > Class 09 > Science

0 answers

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What is incineration?

Posted by Vanshika Sharma 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 5 months ago

Incineration is a method in which waste is burnt at very high temperatures.

Hazardous bio-medical wastes such as discarded medicines, toxic drugs, human anatomical wastes, blood, pus, microbiological and biotechnological wastes, etc. are usually disposed off by incineration.

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Explain how gases can be liquefied

Posted by Sher Mohammed 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

By increasing pressure or by decreasing temperature

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Effect of mass

Posted by Harunal Rashid 4 years, 5 months ago

CBSE > Class 09 > Science

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What would happen if an animal cell is kept in distilled water for 24 hours

Posted by Tanya Mukherjee 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Nishant Choudhary 4 years, 5 months ago

This will result that the cell will swell due to osmosis and so water moves into the animal cell....

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Khushbu Tadvi 4 years, 5 months ago

What is mattet

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Gases neither have definite shape nor definite volume.why?

Posted by Chaitanya Garg 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sanmitra Bhatlavande 4 years, 5 months ago

Particles are far apart from each other because there are very weak forces of attraction between them. They move fast in all directions. Because of this, gases don't have a definite shape or volume and fill any container. Because there is lots of free space between particles, gases can easily be compressed

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Why boiling is called a bulk process

Posted by Yashpal Deora 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

Because all the particle in boiling take part in a bulk or , on the other hand we can say that all the particles take place at a time that's why it is known as

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What os atom

Posted by Rakshit Gangwar 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Ayush Tyagi 4 years, 5 months ago

Atom are the small particles which make matter according to delton they are indivisible Neither be created nor be destroyed in a chemical reaction They take place in chemical reaction

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Yash Soni 4 years, 5 months ago

an atom a fundamental piece of matter an atom itself is made up of three tiny kinds of particles called subatomic particles protons neutrons and electronons. The protons and neutrons make up the centre of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.

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What is law of Om ?

Posted by Dheeraj Chaudhary 4 years, 5 months ago

CBSE > Class 09 > Science