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During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.
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Fermentation is a chemical process by which molecules such as glucose are broken down anaerobically.
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Ozone is formed in the upper atmosphere by the reaction of ultraviolet (UV) radiations on oxygen (O2)(O2) molecules.
Importance. The ozone layer acts as the ozone shield over the surface of the earth and absorbs the harmful ultraviolet radiations of the Sun and prevents them from reaching the earth's surface. The damaging effect of CFCs (Chlorofluorocarbons) is responsible for the depletion of ozone layer.
Harmful effects . The thining of ozone layer results in an incrase of UV-B radiation reaching the earth 's surface . This increase the incidence of cataract and skin cancer diminishing the immune system ' s function.
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The distance between the center of nucleus of atom and its outermost cell is called atomic size..
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1. He could not assign a correct position to hydrogen in the periodic table.
2. Position of isotopes of all the elements were not certain according to mendeleev's periodic table.
3. Atomic masses did not increase in a regular manner in going from one element to the next.So, it was possible to predict how many elements could be discovered between the two elements.
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Meghna Thapar 6 years ago
Universal indicator is a mixture of several indicators and shows different colours at different concentration of hydrogen ions in a solution.
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