Vitamins and minerals are present in our body in very small
amounts, but are very important for the health of the body. Their deficiency
causes many types of disease. The body requires only one hundredth of a gram of
vitamin B every day and its deficiency causes a disease known as beri-beri.
This vitamin is found in bread and meat. Vitamin A is found in corrots and
liver and without it we suffer from night blindness. Vitamin C is present in
fresh fruits and vegetables. It’s absence from the body causes the disease
scurvy. Minerals are equally essential for the body. Iron present in meat, eggs
and bread is needed to make the blood pigment hemoglobin. Calcium from milk,
cheese and bread and phosphorous are required for the growth of bones and
teeth.
Friends you know a keyboard is the most important part of a computer. It consists of different sets of keys that help us to enter information into the computer. Today we will discuss about keyboard and its keys types and use. A standard keyboard has 104 keys. Types of Keys in a Keyboard: Alphabet Keys Number Keys Special Keys Function Keys Navigation Keys 1. Alphabet Keys: 26 alphabet keys are present on a keyboard from A to Z. these keys are not present in the alphabetical order. These keys are used to type words, sentences or paragraphs. 2. Number Keys: These keys are used for typing numbers. These keys are present above the top row of the alphabet keys and also present on the right side of the keyboard. 3. Special Keys: Keyboard has more special keys such as Space bar Key, caps lock key, backspace key, shift key, enter key, symbol keys and tab key etc. 4. Function Keys: 12 function keys are present on a keyb...
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