Evolution :- It is defined as a modification, In which a simple organism is changed into complex one. It is a very slow and irreversible process which can not be absorbed in a life time. Evidences of Evolution :- There are many evidences which prove that the evolution has taken placed. Indirect Evidences :- All…
Origin of Life :- It is the natural process by which life has arisen from nonliving matter such as inorganic compounds. The life originated in the primitive Ocean on the Earth. As the distance from Sun increased, cooling process started. it resulted into the differentiation of regions – 1. Crust :- It is a outermost…
आनुवंशिकता (Heredity) :- संतति में पैतृक लक्षणों के संचरण को आनुवंशिकता कहते हैं। यह संचरण एक पीढ़ी से दूसरी पीढ़ी में जनकों से युग्मको (gametes ) के द्वारा होता है। एक पीढ़ी से दूसरी पीढ़ी में संचारित होनेवाले लक्षण पैतृक लक्षण या आनुवंशिक लक्षण कहलाते हैं। जीव विज्ञान की जिस शाखा में माता-पिता तथा संतान…
डीएनए प्रतिकरण की विधियां (Methods of DNA Replication) :- डीएनए प्रतिकरण की विधियां निम्नलिखित हैं :– 1. प्रारंभन (Initiation) :- 2. कुंडली का खुलना (Unwinding of Helix) :- 3. प्राइमर स्ट्रैंड्स का निर्माण (Formation of Primer strands) :- 4. नए स्टैंड की लंबाई में वृद्धि (Elongation of new strand) :- संतत एवं अर्धसंतत प्रतिकरण (Continuous…
आरएनए (RNA) :- ‘RNA’ एक प्रकार का न्यूक्लिक अम्ल है जिसका पूरा नाम Ribonucleic Acid होता है । आरएनए (RNA) की संरचना :- आरएनए (RNA) का प्रकार :- RNA मुख्य रूप से तीन प्रकार के होते हैं। 1. संदेशवाहक या मेसेंजर आरएनए (mRNA) :- 2. स्थानांतरण या ट्रांसफर आरएनए (tRNA) :- 3. राइबोसोमल RNA (rRNA)…
Deviation without Dispersion :- Deviation produced by flint glass prism for a colour is equal and opposite which produced by crown glass prism. As a result, when the seven colours of light comes out through the flint glass prism, they combine to give a white light. Hence, there is no dispersion of light. This combination…
Optical microscope:- The optical microscope, often referred as the light microscope. It is a type of microscope that uses visible light and a system of lenses to magnify images of small objects. There are two basic types of optical microscope. 1. Simple microscope. 2. Compound microscope. Simple microscope:- A simple microscope is actually a Convex…
Human Eye :- The human eye is the most complicated Sense organ in the body with several parts fixed together form a spherical structure. Our eye is one of the most important optical device the nature has endowed us with. Sclerotic :- It is a tough and thick white sheat that protects the inner parts…
Colloids :- A Colloid is a heterogeneous system in which one substance is dispersed ( dispersed phase ) as very fine particles in another substance called dispersion medium. Colloidal particles have and enormous surface area per unit mass as a result of their small size. Consider a cube with 1 cm side. It has a…
Adsorption :- Adsorption is defined as the deposition of molecular species onto the surface . The molecular species that gets absorbed on the surface is known as absorbate and the surface on which adsorption occurs is known as adsorbent . Common examples of adsorbents are clay , silica , gel , metal etc . Adsorption…
Order of Reaction :- The sum of powers of concentration of the reactants in the rate expression is called the order of that chemical reaction . Example – Rate of reaction = K [ A ]ˣ [ B ]ʸorder Here x and y represent the order with respect to the reactants A and B respectively…
Rate of a Chemical reaction :- Some reactions such as ionic reactions occurs very fast , for example – precipitation of silver chloride occurs instantaneously by mixing of aqueous solutions of Silver nitrate and Sodium chloride . Some reactions are very slow , for example – rusting of iron in the presence of air and…
