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501.

Why is osmosis called a special case of diffusion?

Answer» diffusion takes place in all kinds of mediums i.e., gas ,water, and gas but osmosis takes place in water only. It requires semi permeable membrane
502.

Why plasma membrane is called a living membrane?

Answer» Plasma membrane is called living membrane or selective preamble membrane because it allows only selected materials.
Plasma membrane is called living membrane because it allows selected material to go in or out of the cell
503.

Write the chemical composition of plasma membrane

Answer» Formed by cellulose
504.

Characteristics of compound

Answer» The characteristics of compound are:-1-It has a fixed chemical composition.2-It has a fixed molecular formula.3-It has a fixed melting point and boiling point.4-It can be separated only by chemical methods.
505.

Differentiate between mixtures compounds and elements

Answer» Its given in the book only
506.

A car covers a distance of 100(? ) km in 2.5 hours . Find speed if the car.ANSWER PLEASE!!☝?☝?☝???

Answer» Speed=distance/time=>Speed=100km/2.5hSpeed=40m
To know: The speedGiven, Distance: 100km Time: 2.5kmWe know that, Speed =Total Distance covered/Total Time takenSo, 100/2.5= 100/25*100=40. Ans..
??????
Why 40 ? Please give full solution
40km/h
507.

Who invented the microwave and microscope

Answer» Microwave oven was invented by percy Spencer and microscope by sir Anton Von lueewenhoek
In bio microscope is invented by the person who first seen the living cell
508.

What is atomic mass of manganese

Answer»
509.

Water is a compound? Justify

Answer» Water is a compund because it is formed by the fusion or meeting of oxygen and hydrogen..
510.

Diagram of the nerves tissue with explaination

Answer»
511.

Conservation momemtum

Answer» In the absence of external force ,the net momentum of a system remains conserved
The total initial momentum remain same as the total final momentum if no external force is applied
512.

Who are oviparous

Answer» The organisms producing eggs that develop and hatch outside the maternal body;There is\xa0no other embryonic development within the mother.This is the reproductive method of most fish, amphibians, reptiles, all birds, and the monotremes.
513.

What is perxisomes

Answer»
514.

Define cell who discovered cell

Answer» Cell is made up of tiny unit called organneles it was discovered by robert hooke in 1665 . It is also known as building block of life and the basic structural and functional unit.
Robert Hook was discovered cell in 1665.
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Robert hook
Cell is the basic and fundamental unit unit of life it was discovered by robert hooke in 1665.
515.

What is concentration of Solution?

Answer» Amount of solute present in solution
Concentration refer to amount of salute dissolve in solvent.
516.

What is the smallest organ in our body

Answer» The smallest organ in the human body is the\xa0pineal gland\xa0near the center of the\xa0brain, in a groove between the hemispheres. It\'s not an organ like those in the\xa0abdominal cavity
517.

What is complex tissu?

Answer» The tissues which are made up of more than one type cells and all cells together performs a speicifc function
518.

What is magnetic fields outside solenoid

Answer»
519.

What is apical meristems

Answer» Apical meristem is a part of meristemetic tissue which increases the height of tissuw
It is responsible for incresing the hight of tissue.
520.

Whose discover the living cell?

Answer» Anton van Leeuwenhoek, in 1674
521.

What is staining and mounting

Answer» Staining is an auxiliary technique used in microscopy to enhance contrast in the microscopic image. Stains and dyes are frequently used in biology and medicine to highlight structures in biological tissues for viewing, often with the aid of different microscope. A mounting medium is used to provide a neutral background without altering the color or the chemical composition of the specimen and preserve the specimen from dehydration.
522.

if we burn graphite then what will be result

Answer» Graphite will not burn you can try it by burning a pencil.
523.

FA 1 question paper

Answer» Hi
524.

Density of a substance

Answer» Mass of the substance per unit volume of the substance is its density
525.

Why sky appear blue.

Answer» The sky appears blue to us on a clear day, because the atoms of nitrogen and oxygen in the atmosphere separate the suns white light into its many colors, and scatter them throughout the atmosphere.The wavelength of the blue light scatters better than the rest, predominates over the other colors in the light spectrum, and makes the sky appear blue to us. The scientific name for this phenomenon is the Tyndall effect, more commonly known as Rayleigh scattering. This phenomenon describes the way in which light physically scatters when it passes through particles in the earths atmosphere that are 1/10th in diameter of the color of the light. The light spectrum ranges in wavelength from red to violet, and, since the wavelength of the blue light passes through the particles with greater ease than the wavelengths of the other colors of light, the sky appear blue to the naked eye.
526.

In chapter 9 of ncert what is momentum

Answer» It is defined as the product of mass and velocity of the body
Momentum is used to measure the quantity of motion possessed by a body
527.

POLU full form

Answer» Robert Hooke was someone who discovered cells for the first time with the help of a primitive microscope
Who is Robert Hook
528.

What is the suspension

Answer» it is heterogeneous mixtures
It\'s heterogeneous
Suspension is a homogeneous mixture
529.

Write the defination simple prmanent tissue.

Answer» Thanks
the tissue which present in the plant is known as permanent tissue
The tissu made up of only one type of cell,and look like each other is called simple permanent tissue
530.

Write the function of permanent tissue

Answer» Secretion
531.

One-one example of all 3 law of motion

Answer» Swimming
532.

Why ice cubes float on the water

Answer» It has lower density then that of water
Because liquid generally have lower density as compare to solid but density of ice is lower than water that is due to cage like structure ice float on water
533.

Cell metabolism

Answer»
534.

Name the. Plant tissue

Answer»
535.

What are effect of genetic disease

Answer» If a person has a genetic disorder or disease it is ought to pass on to the next generation because genetic information is passed on to one generation to another. For example :As it happened in Japan ,when it was struck by atom bomb people had to suffer a lot and till today there generation also suffers
536.

Why evaporation causing cooling

Answer» As water when evaporated loses its energy, so in order to regain its energy water vapour absorbs the (heat) energy from its surroundings and thus makes the surroundings cool
537.

Define universal gravitation

Answer»
538.

What is diffuse

Answer» The process of inter mixing of two matter in each other in called as diffusion
539.

What is ATP energy

Answer» ATP means adenosine triphosphate
540.

define pure substace

Answer» A substance made of same kind of atoms or molecules. For eg. Elements and compounds
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541.

what is a mixture?

Answer» More than 2 substances are mixed is known as mixture
When two or more sabstance mixed together is called mixture
More than one substance mixed together is called mixture. It\'s a impure substance. It have no fixed ratio.
542.

Define collenchyma

Answer» When paranchyma and chorollochyma do photosynthes is known as collenchyma
Some times parenkyma contain chlorophyll and perform photosynthesis is known as collenchyma
Parenchyma contain clorophyll and perform photosynthesis is called collenchma
543.

What are sclereids?

Answer»
544.

What is the lower most layer of soil

Answer» Bed rock
Top soil
545.

What is afoetus

Answer» A foetus is that stage of a baby in its mother\'s womb when all its body parts can be recognised after fertilisation. Its usually happens in the 5th to 6th month.
546.

What is the effect of change in the temperature on the solubility of solid in liquid?

Answer»
547.

Why solid have fixed shape

Answer» Because their particles are closely packed
The molecules in a solid are in fixed positions and are close together. Although the molecules can still vibrate, they cannot move from one part of the solid to another part. As a result, a solid does not easily change its shape or its volume.
They do not diffuse or diffuse really slow. Have least space between them. Possess more intermoleculer space between them.
548.

what is the atoms

Answer» An atom is the smallest particle of an element which takes part in a chemical reaction.It may (eg: Helium, argon) or may not (eg: Oxygen, hydrogen ) occur in its free state.All matter is made up of atoms.
Atom is the small particle which may or may not exist in free state.
Every matter is made up of very small particles called atoms
The smallest particle of element
549.

why is distilled water used in determining the boiling point of water.

Answer»
550.

Define physical and chemical and give example of each?

Answer» Write properly please
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