Assertion: Before the first microscope was invented around 350 years ago, people were not aware of the living world that was not visible to the naked eye.Reason: To study about basic structures, a proper use of microscopes and preparation of microscopic slides and staining is essential.

Who was the first to observe microorganisms with a microscope?

One of the results of the inventions of the microscope and telescope is that it expanded the world as people knew it. Distant stars and microscopic organisms previously unseen and unknown provided a wealth of knowledge to scholars. Which of these statements is true regarding these two inventions? A. Lenses in microscopes and telescopes can form perfect images. B. Telescopic lenses, found in Greece, date back 2000 years. C. Image resolution has advanced as far as it can ever go. D. Galileo made important improvements to both instruments.

Which among the following was done by Johannes Purkinje?Invented the first compound microscopeFirst observed living cells of bacteria, sperm and protozoaNamed the fluid content of the cells as protoplasmObservation of ribosomes in animal cell

Who used a microscope of very poor quality and even though is used three lenses, he could see very little detail?Responses

From a very early period in my life all my interest had been toward microscopic investigations. When I was just ten years old, a distant cousin, hoping to astonish my inexperience, constructed a simple microscope for me by drilling a small hole in a disk of copper, in which a drop of pure water was sustained. This apparatus, magnifying some fifty diameters, showed only indistinct forms, but was still sufficiently wonderful to work up my imagination.     Seeing me so interested in this instrument, my cousin explained all that he knew about the principles of the microscope, told me a few of the wonders discovered through its use, and ended by promising to send me a properly made one upon his return to the city. I counted the days, the hours, the minutes between that promise and his departure.     Meantime, I was not idle. Every substance that bore the remotest resemblance to a lens I eagerly seized. All panes of glass were ruthlessly destroyed in the hope of obtaining lenses of marvelous power. I even went so far as to steal the glasses from my Aunt Agatha's spectacles, with the idea of grinding them into lenses of wondrous magnifying properties—in this attempt it is unnecessary to say that I totally failed.     At last the microscope came. A better apparatus could not have been selected. Accompanying it was a small treatise on the microscope—its history, uses, and discoveries. Suddenly, the dull veil of ordinary existence that hung across the world seemed to roll away, and to lay bare a land of enchantments. I was in daily communication with living wonders such as I had never imagined. Where others saw only a drop of rain slowly rolling down the window-glass, I saw a universe of beings. In common mildew, I saw enchanted gardens, filled with the densest foliage, while from the fantastic boughs of these microscopic forests hung strange fruits glittering with green and silver and gold.     It was no scientific thirst at this time that filled my mind. It was the pure enjoyment of a poet to whom a world of wonders has been disclosed.2Which sentence best develops the theme that new discoveries can change the way we see the world? A. Suddenly, the dull veil of ordinary existence that hung across the world seemed to roll away, and to lay bare a land of enchantments. B. Every substance that bore the remotest resemblance to a lens I eagerly seized. C. It was no scientific thirst at this time that filled my mind. D. This apparatus, magnifying some fifty diameters, showed only indistinct forms, but was still sufficiently wonderful to work up my imagination.