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551.

What is crystallization process? How it is useful.

Answer» Second point says separation of crystals of alum from impure samples
Crystallization is a process that separates a pure solid in the form of its crystals from a solution. It is used•in purification of salt obtained from sea water. •in separation of crystals of Al from impure samples.
552.

Name the organisms or virus which cause disease tuberclosis

Answer»
553.

what is atomicity of following 1)

Answer» ???
554.

About leucoplasts function please help me for my unit test

Answer» It is white in colour or colourless and is used to stire oils , starch etc.
Leucoplasts is a colour less pigment in plastides and it stores lipids and granules
White in color, number -mm^3-6000 to 10000, life span 13 days, are of two types--1) granulocytes 2)agranulocytes,process of formation of leucocytes is known as leucopoisis, commonly known as WBC
555.

How can differentiate between root hairs and trichomes

Answer»
556.

How will you separate a mixture containing chalk,iodine and sodium chloride?

Answer»
557.

What is the difference between prokaryotic and eukaryotic cells ?

Answer» Nucleus
558.

Which cell organelle have their own genetic material

Answer» Nucleus , mitochondria and plastids
559.

Name the tissue which helps in easy bending of plants

Answer» Collenchyma , as it provides flexibility to the plant.
Parenchyma
560.

What is rate of change of accelaration

Answer» Velocity
Nothing
Velocity
561.

Name the technique of separate butter from curd

Answer» Centrifugation
Centri fugation
Centrifugation
562.

Give. Example of. Inertia

Answer» If the bus driver suddenly applies break the passenger fall backwards due to inertia
If a bur or car is in rest and starts the bus is in motion due to inertia of motion .
Person sitting in a bus at a bus stops and the bus starts suddenly. They will experience inertia
563.

Functions of cork

Answer» Not it is a dead cell
Protect the internal tissue
564.

How would you prepare a saturated solution of sodim chloride in water at 25 c

Answer» A saturated solution is a solution in which no more solute can be dissolve at given temperature. The addition of any more solute will result in the accumulation of that solute in the bottom of the container.To prepare the saturated solution of NaCl at 25°C, take a measured volume of water (say 100 ml.) in beaker and warm it up to 25°C\u200b. Then add NaCl pinch by pinch at constant stirring and observe the point when no more NaCl is dissolving in water. At that point the added pinch of NaCl will appear at the bottom of beaker and your saturated solution is prepared.
565.

Which state of matter is most easily compressible?

Answer» Gaseous state
Gaseous state
Gaseous state
Gasouse state...
Gaseous state
566.

Chemical structure of c2h4

Answer» Ethene is the formal IUPAC name for H2C=CH2, but it also goes by a common name: Ethylene. Ethene is not a very complicated molecule. It contains two carbon atoms that are double bonded to each other, with each of these atoms also bonded to two Hydrogen atoms.
567.

What is volatile substance.

Answer» The substance which boiling point is very less is called volatile substance. Like ether, alcohol
568.

Definition of cause of motion

Answer» When an object is move in there places
569.

Can displacement be negative??

Answer» Yes it can be negative ; 0 ;positive because it is a vector quantity
Displacement may be positive, negative and even 0
Yes displacement can negative because it is a vactor quantity
No..... Displacement is a unit of distance and distance can\'t be negative
Yash rawat give example please
Yes
570.

A particle moves 3m north 4m east and finally 6m south. Calculate thedisplacment

Answer» 5m SW
571.

Change the speed 6 m/s into km/h.

Answer» Muliplied 6 by 18/5 then m/s change into km/ hr ,??
21.6
572.

Distance is scalar or vector ?

Answer» Scaler
Scalar
Scalar
Vector
573.

Is displacement a scalar quantity ?

Answer» No
No it is a vector quantity
Is it vector ?
No
574.

Difference between pop and cement

Answer»
575.

What is Heterogeneous?

Answer» yes
The mixture in which 2 or more than 2 substance not mix completely
The mixture in which the substance are not completely mixed together
A mixture whose particles are not well mixed are called heterogeneous mixtures.
576.

Differenc between cantact non-contact

Answer» Is called non-contact
A force which applied by touching is called contact force while a force which donot want any contact
577.

What is the SI unit of force & momentum ???

Answer» SI Unit of force is N and the SI unit of momentum is Kg m/s
The SI unit of force is newton and the SI unit of momentum is kg m/s
578.

I want a time table for my mid term exam

Answer» 18 sptmbr till which date???
Mid term exams from 18september.
579.

Why is solid carbon dixoide is called dry ice

Answer» Due to the process of Sublimation
It directly goes under the process of sublimation and don\'t transform in liquid..
Because when itmelt then it directly change into Co2 without coming into liquid
580.

Which organelles plays a role in amoeba

Answer» I think nucleos
I think vacuole
581.

What is the term 1 portion of science class 9

Answer» The fundamental unit of life,matter in our surroundings, is matter around us pure,tissues,motion,force and law of motion ,gravitation,why do we feel ill,improvement in food resoures
582.

Quaver

Answer»
583.

An electric engine has a velocity of 120 km per hr.what dist. Will it cover in 30 seconds

Answer» By into
584.

Write down the characteristics of a cell?

Answer» Nucleus and cytoskeleton and cell division and growth and i am not learn it other important characterstics
585.

What is hypotonic solution ?

Answer» The type of solution provides free water sodium and chloride but does not provide calories or other electrolytes. An example of a hypotonic solution 0.45% sodium chloride (0.45%NS) commonly called half normal saline..
586.

Question answar

Answer»
587.

Ice is homogeneous mixture or heterogeneous mixture

Answer» Ice is homogeneous
Ice is not a mixture..
588.

Explain Angiosperms and Gymnosperms?

Answer» Angiosperms\tAngiosperms are seed producing flowering plants whose seeds are enclosed in the ovary.\tAngiosperms are seasonal .\tAngiosperms possess flowers which enclose the reproductive structures.\tAngiospermic flowers can be unisexual or bisexual.\tAngiosperms possess cotyledons\tSeeds are enclosed inside the ovary that is a fruit in Angiosperms.\tWood is hard in Angiosperms.\tAngiosperms are non-perennial .Gymnosperms\tGymnosperms are seed producing non-flowering plants whose seeds are naked.\tGymnosperms are evergreen.\t\xa0Gymnosperms the reproductive structures are present in cones.\t\xa0Gymnospermic cones are unisexual.\tGymnosperms do not have cotyledons.\tSeeds in Gymnosperms are bare found on cones.\tWood is soft in Gymnosperms.\t\xa0Gymnosperms are perennial.
589.

What is collision?

Answer»
590.

Difference between solid liquid gas

Answer» Solids are like rock means no space between them.Liquids like water means they have les space.Gases like air means they have large space between them.
591.

Decantation means.

Answer» Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a sus
592.

What is chronography

Answer» History,or description about past time
593.

difference between mass and weighy

Answer» \tMassWeightMass is the quantity of matter contained in the body.Weight is the force of gravity acting on the body.\xa0 It is the measure of inertia of the body.\xa0 It is the measure of gravity.\xa0Mass is a constant quantity.Weight is not a constant quantity. It is different at different places.\xa0 It only has magnitude.\xa0 It has magnitude as well as direction.\xa0 Its SI unit is kilogram (kg).\xa0 Its SI unit is the same as the SI unit of force, i.e., Newton (N).\t
594.

Derive the conservation of law of momentum

Answer» The law of conservation of momentum can be explained from the second law of motion. Newton’s second law of motion says that rate of change of linear momentum of a body is equal to the net external force applied on it.Mathematically it is expressed as: dPdt(mv)dtmdvdtmaFnetIf the net external force acting on a body is zero, then the rate of change of momentum is also zero, which means that there is no change in momentum
595.

What is villi and photosynthesis

Answer» Photosynthesis: Animals need to eat food to get their energy. But green plants and algae do not. Instead they make their own food in a process called photosynthesis. Almost all life on Earth depends upon this process. Photosynthesis is also important in maintaining the levels of oxygen and carbon dioxide in the atmosphere.Villi: The finger like projections in the inner walls of the small intestine is called villi. These are found in small intestine. he villi increase the surface area for absorption of the digested food.
596.

Why does\'nt honey mix with water?

Answer» Water particles are have spce between them and honey are does not space betwqen them
597.

Where haemoglobin is present in chordates?

Answer»
598.

What is the function of placenta?Plz give this answer fast kal mera test haa ...

Answer» Placenta is the circular organ present in the uterus of pregnant mammals which is required for the nourishment and maintenance of the fetus. It performs various function like:1) Nutrition : It helps to transport nutrients from mother\'s blood to foetus for its development.2) Respiration: It provides oxygen to the fetus and take CO2 away from the fetus.3) Excretion: It helps in the removal of waste products from the fetus and transfers them to mother\'s blood.4) Immunity: It provides immunity to the fetus. Antibodies developed in mother passes onto fetus through the placenta.5) Storage: Placenta can stores some fats, glycogen and iron.6) Secretion of hormones: It secretes many hormones like estrogen, progesterone, gonadotropin and placental lactogen, thus functions as an endocrine gland.
599.

Why we see water droplet after heating the water

Answer» Bcoz it is the effect of boiling. If we boil water at 100degree centigrade, the water evaporate and becomes water vapour the that\'s why we see water droplet after heating
600.

What are the difference between the mass of an object and its weight?

Answer» Hi Atus, Mass of an object is same all over the universe. But weight depends on the gravitational pull (of the planet/moon)9990972508wp