Kitab Nagri

Cell Wall and its Function   Location:   It is outer most boundary of plant cell. It is absent in animals cell.   Thickness:   It may be thick as outer wall of trachieds or as parenchyma tissues.   Tissues:   i) Parenchyma tissues are composed to thin wall and its function is storage. ii)…

Cell Membrane and its Function   Location:   It is outer most in animal’s ceII while in plant cell it is present inside the cell wall.   Thickness:   It is few micron meter thick.   Composition:   Basically is composed of lipids and proteins. It consists of two layers if lipids in which protein…

Difference Between Cell Membrane and Cell Wall   Cell Wall:   Location:   It is outer most boundary of plant cell. It is absent in animals cell.   Thickness:   It may be thick as outer wall of trachieds or as parenchyma tissues.   Tissues:   i) Parenchyma tissues are composed to thin wall and…

Electron Microscope and its Working   This is advanced microscope.   Its resolving power is 250 times more than a normal microscope.   In this microscope a beam of electrons under high voltage is passed through object for making a photograph.   The wavelength of electron beam is 1/100000 of white light.   Electron microscope…

Relationship between Metabolism and Response   Increased metabolism produce stimuli and organism give response in the form of growth, reproduction, movement etc   If a person likes to read, this is his hobby; he learns much more information from the primary source. It is possible to form a clear picture of the cultural traditions of…

Metabolism related to Growth   New protoplasm is formed due to metabolism. New compounds are synthesized which increase the size of cell. This increase in size and weight is called growth.   Experience real emotions. We read books in English in the original – we get an unforgettable impression from the original. Any translator can…

Cell and Cell Theory   In 1665 an English Scientist Robert Hook first studied thin slices of cork and leaves under microscope. He found small boxes like chambers. He called them cells.   In early 19th Century compound microscope was invented. Then Robert Brown discovered nucleus in the cell. Then it was also known that…

Abiogenesis Proven Wrong   In 1668, an Italian scientist F. Redi performed experiments to disprove the abiogenesis.   Redi’s Experiment:   i) He took two sets of four bottles each. ii) In first set, he put dead snakes in first bottle, dead fish in second, dead Eels in third and some meat in fourth. All…

Impact of Biological Studies on Human Welfare   Biology helps us in daily matters in many ways. Some of them are given below:   1-Food Production:   Food has basic importance in our life. Agriculture has been improved due to research of biology. Selection of better seeds gives us better quality and quantity of crops,…

What are Autotrophs   Autotrophs are those organisms, which can prepare their own food. e.g plants.   Where can I get books in electronic format? Quarantine, and, accordingly, restrictions on the purchase of books, caught many suddenly, so it was not possible to stock up on literary masterpieces, but this is not a problem, because…