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

Cell wall is present only in plant cell for additional support as animals already have bones to protect them Plasma membrane is present in both Plant and Animal Cell for protecting materials not to enter into the cell but it will allow necessary things like water,oxygen etc

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Savita Savi 3 years, 2 months ago

Cell wall is present in plants. Plasma membrane is present in animals

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Yashika Khantwal 3 years, 2 months ago

-Plasma membrane is semi permeable .. -Cell wall is entirely permeable .. -Plasma membrane is thin and visible only under an electron microscope .. -Cell wall is visible through a light microscope.. -Plasma membrane is living and metabolicaly active. -cell wall is non living and inactive

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Write an essay on pollution urbanisayion

Posted by Aaditya Thorat 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 2 months ago

The days are gone when kids would roam freely on streets and birds would fly in the sky. Such a nice scene has been very rare to see, nowadays. We should blame ourselves only! India was a land of villages; our culture arose from villages only. But than we did something so bad that we are paying the price of it even today. We have replaced the major part of earth with factories, mills and building causing pollution.

There are Various Levels at which Urban Pollution is happening like:

Types and Causes of Urban Pollution

Air Pollution: The air in the urban areas is always polluted with harmful substances and it is becoming hazardous day by day to breathe. The air in the cities is choking. The smoke from automobiles, factories and power generators make the air unhealthy. There are other factors also like chemical spills and other toxic gases that contaminate the air.
Water Pollution: As it is there are very less natural water sources in the urban areas and the ones that are there are getting increasingly polluted. There is a lot of disposal in the lakes and rivers like household & industrial disposal. A lot of waste gets mixed with rain and washed into the waters.
Soil Pollution: The mixing of toxins in the soil is disturbing the eco-system.
Noise Pollution: Urban areas are one of the noisiest ones. Various sources of noise pollution include traffic noises, loud-speakers and other unwanted noises cause many health issues.
Radioactive Pollution: The accidental leakage by nuclear power plants poses a big threat.
Visual Pollution: The over exposure of visuals in the cities in the form of signs, billboards, screens, high intensity lights etc. are also quite disturbing.
Other than these there is also ‘Thermal pollution’ that is caused by excessive amount of heat trapped in earth’s atmosphere.

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An object dropped from a cliff falls with a constant acceleration of 10 m/s2. Find its speed 5 s after it was dropped

Posted by Vidhi Radiya 3 years, 2 months ago

CBSE > Class 09 > Science

0 answers

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Difference between animal cells and plants cells.

Posted by Ankit Pandey 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Rishabh P 3 years, 2 months ago

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Mithun P 3 years, 2 months ago

Plant cell Animal cell 1. Have a cellulose cell wall outside the cell membrane. 1. Have no cell wall. 2. Have a cell membrane. 2. Have no chloroplasts. 3. Have cytoplasm. 3. Have only small vacuoles. 4. Have a nucleus. 4. Often irregular in shape. 5. Often have chloroplasts containing chlorophyll. 5. Do not contain plastids. 6. Have prominent one or more vacuoles. 6. Have complex and prominent Golgi apparatus. 7. Often regular in shape. 7. Cytoplasm fills almost the entire cell

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Pra Jit 3 years, 2 months ago

*PLANT CELL: *Plant cell has cell wall. *Nucleus is present in the side of the cell. *Centriole is absent. *Plant cell has large vacuole *ANIMAL CELL: *It does not have cell wall. *Nucleus is present in the center of the cell *Centriole is present. *In animal cell vacuole are absent or they are in small size.

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Definition of fractional distillation

Posted by Priyanshu Raj 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Kanta Jashvitha 3 years, 2 months ago

The technique for the separation of miscible liquids i.e. liquids which dissolve in each other is known as fractional distillation. Fractional distillation is a process of separating the components of a mixture by repeated distillations and condensations. Fractional distillation works on the principal that different liquids boil at different temperature. The miscible liquids boil at different temperature and evaporate at different temperature. Fractional distillation is also used for the purification of water. It is also used for separating acetone and water. Industrial use of fractional distillation is in petroleum refineries, chemical plants, natural gas processing and separation of pure gases from mixture of gases.

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Honey is more sleepry than water.Can you suggest why?

Posted by Sahitya Rathore 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Priyanshu Raj 3 years, 2 months ago

Honey has more strong intermolecular attractive forces than water, so the particles are strongly bound in honey than in water. Hence honey is more viscous than water.

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What is the fundamental unit of life

Posted by Teenager'S Terror 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Varun Vaid 3 years, 2 months ago

cell

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Shaurya Upadhyay 3 years, 2 months ago

Cell

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Pra Jit 3 years, 2 months ago

Cell is the basic and fundamental unit of life

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Gyanendra Pratap Singh Parihar 3 years, 2 months ago

Cell is the fundamental unit of life

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Shubham Kumar 3 years, 2 months ago

Cell is the fundamental unit of life

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Mixture defination

Posted by Kim Nelina 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Gagan Kaur 3 years, 2 months ago

substances are mostly mixed with one another and their combination is known as mixture.

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Varun Vaid 3 years, 2 months ago

when more than two substances are combined then they form mixture.

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Pra Jit 3 years, 2 months ago

Two or more subtances combained together is called a MIXTURE.

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Chapter 1 blue question answer

Posted by Vishvjeet Kushvaha 3 years, 2 months ago

CBSE > Class 09 > Science

0 answers

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Identify the type of motion by line OA and BC. (ii) What is the time duration during which the car moves with constant velocity?(iii) Calculate the acceleration between the 3rd and 10th second.(iv) What is the distance travelled in the first 10 s?

Posted by Sarthaki Chaudhari 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Shashank Rotti 3 years, 2 months ago

Liner motion

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ANSWER

A Shining Thick Liquid is Often used in glass thermometer. Name it

Posted by Krishna Rajput 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Sarthak Kumar Prajapati 3 years, 2 months ago

Mercury

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Krishna Rajput 3 years, 2 months ago

Mercury right answer

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Anmol Chauhan 3 years, 2 months ago

Mercury

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Sakshi Sharma 3 years, 2 months ago

Mercury

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Shivashish Medha 3 years, 2 months ago

Mercury

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Draw a neat diagram of plant cell and label any three part which differtiate it from Animal cell

Posted by Akshaya Deepika 3 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Sarthak Kumar Prajapati 3 years, 2 months ago

1. Cell Wall 2. Large Vacuole 3. Chloroplast

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Pra Jit 3 years, 2 months ago

1)Cell Wall, 2)Large Vacuole, 3)Chloroplast.

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ANSWER

Calculate the number of particles in each of following (a) 46g02 of Na atoms(number from mass)

Posted by Lipokmeren Amri 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Kanta Jashvitha 3 years, 2 months ago

Molar mass of sodium=23g/mol. The given mass of sodium is 46g. ∴ The number of particles present in 46g of Na atom is 12.046×1023.

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ANSWER

What is migration????

Posted by Ankit Raj 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Khushi Singh 3 years, 2 months ago

Ankit you are here to study not to ask how are you

3Thank You

Khushi Singh 3 years, 2 months ago

Migration is the way to move from one place to another in order to live

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Siddhi Gadiya 3 years, 2 months ago

Moving from one place to another

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ANSWER

Define consumes biology

Posted by Uday Patil 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Kanta Jashvitha 3 years, 2 months ago

Consumer in a food chain are living creatures that eat organisms from a different population. First, it is necessary to understand these two classifications, heterotrophs and autotrophs, consumers and producers respectively. Vons are organisms that obtain energy from other living things.

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how can we separate a mixture of sodium chloride and ammonium chloride

Posted by Kashish Gadapele 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Trisha Verma 3 years, 2 months ago

By the process of sublimation

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Ranjot Kaur 3 years, 2 months ago

We have a mixture of sodium chloride and ammonium chloride . Mixture of sodium chloride and ammonium chloride is white in colour but upon heating , ammonium chloride is turn into vapour and sodium chloride does not thus the mixture is separated . We can separate the above mixture through sublimation

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Uday Patil 3 years, 2 months ago

Through seperating funnel

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What is the melting point of a solid

Posted by Sammar Gupta 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Pra Jit 3 years, 2 months ago

The Melting point varies from solid to solid and liquid to liquid .So there is no common boiling point for solids

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Sahitya Rathore 3 years, 2 months ago

Melting point of solid is 0 degree celsius. 100 degree celsius is the boiling point of water

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Shaurya Upadhyay 3 years, 2 months ago

100 degree Celsius

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Khushi Singh 3 years, 2 months ago

0°C

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Uday Patil 3 years, 2 months ago

100 degree Celsius

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Why is it not possible to distinguish the particles of the solute from those of the solvent in a true solution?

Posted by Vibhuti Kumari 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Pra Jit 3 years, 2 months ago

True solution means after mixing the solute and solvent it has the SAME TYPE of ATOMS.So, it is not possible to distinguish solute and solvent again.

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ANSWER

Define immiscible liquid .

Posted by Vibhuti Kumari 3 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Khushi Singh 3 years, 2 months ago

Immiscible liquid are those liquid solution that doesn't mix completely in water

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Uday Patil 3 years, 2 months ago

Immiscible liquids are those liquids which are not mix Ex:add mustard oil and water ,rub it continuously .It will not mix

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Is physics easy

Posted by Shreya Sri 3 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Uday Patil 3 years, 2 months ago

The people who thinks phy is hard then phy will hard for them Those who will concentrate on it Phy easy

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Uday Patil 3 years, 2 months ago

No physics is not hard ,if you understand the process

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Vibhuti Kumari 3 years, 2 months ago

a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

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Vibhuti Kumari 3 years, 2 months ago

No, physics is harder than Biology and chemistry

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Najreen Najreen Khan 3 years, 2 months ago

What is osmosis

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According to modern days scientists write how matter is classified?

Posted by Vannshika Verma. 9Th A, 38. 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gagan Kaur 3 years, 2 months ago

matter can be classified in two ways 1.physical classification 2.chemical classification

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Which of the following is not related to endoplasmic reticulum

Posted by Saie Bhadale 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Harish Gupta 3 years, 2 months ago

Hypotonic solution

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Definition of A) uniform motion B)non-Uniform motion

Posted by Patel Jiya 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Khushi Singh 3 years, 2 months ago

Uniform motion- The motion of the body that covers equal distance in equal interval of time is known as uniform motion. Non - Uniform Motion – The motion of the body that covers equal distance but in equal interval of time or unequal distance in equal interval of time is known as non-uniform motion.

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Vibhuti Kumari 3 years, 2 months ago

Ya this is right?

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Pushkar Tanwar 3 years, 2 months ago

Uniform Motion – It is the motion in which a object travel same distance in equal interval of time. Non Uniform Motion – It is the motion in which the object travel same distance but in equal interval of time.

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Distance time graph body at rest

Posted by Siddhi Sahu 3 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

When will you say a body is in (1) uniform motion (2) non - uniform motion

Posted by Vivan Yadav 3 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Khushi Singh 3 years, 2 months ago

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Master Jd 3 years, 2 months ago

Answer : (1)Uniform Motion-A body is said to be in uniform motion if it covers equal distance in equal interval of time. (2)Non-uniform Motion-A body is said to be in non-uniform motion if it covers unequal distance in equal intervals of time.

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What is valley

Posted by Harsh Singh 3 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Master Jd 3 years, 2 months ago

Answer : A low area of land between hills or mountains, typically with a river or stream flowing through it.

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❖Mʀ᭄ ℟ᴜđʀ₳★ᶠᶠ 3 years, 2 months ago

Noob you don't know that what is valley. LOL

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An athlete complete one round of

Posted by Priyarajsinh Vaghela 3 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is the difference between Kelvin and celcius

Posted by Aditya Gupta 3 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Mohanty Trupti Ranjan 3 years, 2 months ago

The kelvin is the base unit of temperature in the International System of Units (SI), having the unit symbol K. The relation between kelvin and celsius scales is TK = t°C + 273.15. On the Kelvin scale, pure water freezes at 273.15 K, and it boils at 373.15 K. It is named after the Belfast-born Glasgow University engineer and physicist William Thomson, 1st Baron Kelvin (1824–1907).

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Mohanty Trupti Ranjan 3 years, 2 months ago

Celsius relates to, the Celsius temperature scale (previously known as the centigrade scale). The degree Celsius (symbol: °C) can refer to a specific temperature on the Celsius scale as well as serve as unit increment to indicate a temperature interval(a difference between two temperatures or an uncertainty). “Celsius” is named after the Swedish astronomer Anders Celsius (1701-1744), who developed a similar temperature scale two years before his death. K = °C + 273.15 °C = K − 273.15 Until 1954, 0 °C on the Celsius scale was defined as the melting point of ice and 100 °C was defined as the boiling point of water under a pressure of one standard atmosphere; this close equivalence is taught in schools today. However, the unit “degree Celsius” and the Celsius scale are currently, by international agreement, defined by two different points: absolute zero, and the triple point of specially prepared water. This definition also precisely relates the Celsius scale to the Kelvin scale, which is the SI base unit of temperature (symbol: K). Absolute zero—the temperature at which nothing could be colder and no heat energy remains in a substance—is defined as being precisely 0 K and −273.15 °C. The triple point of water is defined as being precisely 273.16 K and 0.01 °C.

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Mohanty Trupti Ranjan 3 years, 2 months ago

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