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WHAT IS A CELL ? Cell is the fundamental structural and functional unit of all living organisms. Let us observe a unicellularorganism (e.g., Amoeba) under a microscope. We will find that a single cell is capable of independentexistence and also performing the essential functions of life. In fact, all cells have certain structures in  common to carry out basic life processes, but differential distribution of  organelles gives cells distributionof organelles cells distinct characteristics. Why Do the Organisms Have Cells ? In the living organisms, the metabolic reactions can occur only in a delicately balanced environmentthat is different from any found in the non-living objects. Cells are the life-supporting chambers which havesuch a special environment. A living cell keeps its chemical composition steady within its boundary. Thiscondition is called homeostasis (G. homoios= same; stasis= standing). In the controlled environment of acell. all life activities can occur in a desir...

HYDROGEN AND ITS COMPOUND.Class 11th and IIT- JEE.   In chemistry we are starting HYDROGEN ANDITS COMPOUNDS.          In the topic HYDROGEN AND ITS COMPOUNDS, The very first thing is, How was hydrogen discovered? What is its position in periodic table?  And on what basis hydrogen is said to be anelement for which a fixed position has not been assigned in periodic table.  Then after we shall study about the methodsto prepare diatomic hydrogen, Its properties and then the compounds of thehydrogen, So the things start from its discovery,Hydrogen for the first time was obtained by the action of certain metals on some acids,By the reaction between some active metals and some acids,Hydrogen gas was liberated.  The name hydrogen was given on the basis onthe fact that hydro word stands for water. And gen means, the derivative. So on burning, on combustion hydrogen formsH2O, On that basis it is considered to be waterproducing gas.  So hydrog...

  Hello students today we are going to start 1  chapter of class 11 chemistry so we will study  the first chapter of chemistry which is basic concepts of chemistry  .         In this, we see  why chemistry is important  and which chemical we use and what are the significant how it helps us in many ways what is a significant figure  what is an element what is mixture all these basic we will not do which is some basic parts of chemistery we will tell you what is a chemical combination . And we will tell you that what is the law of combination   so the laws of chemical combination we will study today there are 5 big laws in chemistry yes there are 5 big laws   who decide how the element will combine and  form compound {repeated}      so a mass of one element form compound form with other elements in which percentage it will react in how many moles which ga...

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