RIYA SINGH

CBSE Class 9 Science Biology Diversity in living organisms question and answers 1.In what respects are lichens unusual plants? Ans. lichen is a close partnership between an alga and a fungus. The algal cells grow in the fungal mycelium. Alga make food by photosynt hesis. The fungus provides shelter and protection to the alga. Thus, both the alga and the fungus benefit. This kind of association is called a symbiotic asso ciation. 2.Na me two coelenterates with diagrams. How do porifera n animals differ from coelenterate animals? Ans.Examples of coelenterates. Poriferans are the simplest multicellular and branched. The cells are loosely held together and do not form tissue Coelenterates have one continuous central cavity called coelentron. 3.Differentiate between the heart of a fish and a bir ds? Ans.Heart of fish is two chambered – auricle an d ventricle whereas birds have four chambered heart. 4.What is the difference notochord and nerve cord? Ans.Notochord is a solid stiff but flexi

SHORT SUMMARY We can try to know about the event of surrender of Germany in 1945 by the Allies . And a real story of Helmuth and his father's story, a story of Nazi criminality during the war. Helmuth's father realized his mistakes committed against the Jews and felt the Allies too treat them in same way and shared views with his family and shot dead himself. The historic second world war from 1939-45 ruined the civilian and military population in a dreadful manner . It was unrecoverable damage to the mankind. It is believed that the Nazis victimized the Jews and at the end they were defeated . Adolf Hitler and his propaganda minister and their family committed suicide . So it is very necessary to understand about Hitler and his Nazism derived from his autobiography namely Mein kampf that means "My Struggle" in German language. When he was put into prison by the government of Germany, he wrote this book and expressed his ideology.Mainly it reflected of his vi

CREATED BY-RIYA SINGH Windows Desktop Windows “Desktop” is like a working surface of a desk. Desktop is where your applications, folders and shortcuts are located. Desktop contains the following items. 1. Icons 2. Taskbar 3. Start Button The function of these desktop items is given below: 1. Icon An icon is a small colourful graphical picture that represents an object like a file, folder, program or any hardware components of the computer. Every icon has a lable, which identifies it. The labels can be changed. Windows operating system uses different icons to represent files, folders and applications. Icons found on the desktop are normally left aligned. Icons of the Desktop. The icons provided by windows are: 1. My Documents 2. My Computer 3. My Network Places 4. Recycle Bin 5. Internet Explorer 2. Task Bar The task bar is at the bottom of the desktop but you can move it to the top or either side of the screen by cli

CREATED BY-RIYA SINGH PRINTER- A computer peripheral that puts text or a computer generated image on paper or on another medium, such as a transparency. Printer can be categorized in several ways the IMPACT PRINTING- the method used by the conventional type writers. In some type of impact printing a metal “hammer” embossed with a character strikes a print ribbon, which presses the characters image into paper. Most common distinction is IMPACT and non-IMPACT PRINTER ribbon characters created through impact printing can be formed by either a solid font or dot matrix printing mechanism. NON – IMPACT PRINTING- Does not depend on the impact of metal on paper. In fact no physical contact at all occurs between the printing mechanism and the paper. The most popular non-impact methods today utilize thermal transfer, ink-jet.TYPES OF PRINTERS 1. DOT MATRIX PRINTER-Any printer that produces character made up of dots using a wire pin printed head. The quality of output from a dot matrix

Central Processing Unit – CPU The central processing unit (CPU), also called the microprocessor, the processor or central processor is the brains of the computer. The CPU is housed on a tiny silicon chip. This chip contains millions of switches and pathways that help your computer make important decisions. The switches control the flow of the electricity as it travels across the miles of pathways. The CPU knows which switches to turn on and which to turn off because it receives its instructions from computer programs. Programs are a set of special instructions written by programmers that control the activities of the computer. Programs are also known as software. The CPU has two primary sections: · Control Unit · Arithmetic/Logic Unit Arithmetic/Logic Unit Because all computer data is stored as numbers, a lot of the processing that takes place involves comparing numbers or carrying out mathematical operations. In addition to establishing ordered sequences and changing those seq