Calcium: i) Role:a) It is essential constituent of bones and teeth.b) It is vital for metabolic process such as nerve function, muscle contraction, and blood clotting.ii) Source: Dairy Productsiii) Deficiency: Osteomalacia (softening of bones), Osteoporosis, Rickets, Tetany Iron: i) Role: It is the key constituent of haemoglobin which helps in transfer of oxygen.ii) Source: Eggs, […]
Continue ReadingVitamin Ai) Role: Vitamin A plays an important role in growth and body repair, keeps the skin smooth and essential for vision.ii) Deficiency: it deficiency causes “Night Blindness”.iii) Source: Fortified milk, butter, eggs, cream, leafy vegetables, carrot. Vitamin B1i) Role: it is an energy building vitamin, help in the digestion of carbohydrates, keep the heart […]
Continue ReadingSaturn In 1610, Galileo became the first person to look at Saturn through telescope. • Distance from Sun 1427 million kms.• Revolution period 30 years.• Rotation period 10h, 14 mins.• It has 62 moons.• The largest moon of Saturn is the Titan and it is the second-largest moon in the solar system. Titan is larger […]
Continue ReadingMars • Distance form sun 228 million kms.• Revolution period 687 days.• Rotation period 24 h, 37 min and 22 sec.• It has two moons Phobos and Deimos.• Its diameter is 6794 kms.• Mars is covered with red dust.• It has an atmosphere composed almost entirely of CO2.• Its average temperature is -53 0C. Jupiter […]
Continue ReadingThe earth is the largest and the densest of the four terrestrial planets. It is the most wonderful planet of the solar system. Following are the features of the Earth. • Its distance from the Sun is 150 million kms.• Its revolution period is 365 ¼ days.• Its rotation period is 23 hours, 56 minutes, […]
Continue ReadingApart from the moon, Venus is the brightest object in the sky. Venus can be seen with naked eye in the morning or in the evening. Following are the main characteristics of the Venus. • Its distance from the Sun is 108 million kms.• Its revolution period is 224.7/225 days.• Its rotation period is 243 […]
Continue ReadingMercury • Its distance from Sun is 58 million kms.• Its revolution period is 88 days.• Its rotation period is 58 days, 15 hours and 30 minutes.• It has no moon.• It is the nearest planet to the sun.• It is also the smallest planet of the solar system.• It is the fastest planet.• Its […]
Continue ReadingSolar System • The solar system is the family of the sun, planets revolving around it, the satellites of the planets and the asteroids or meteoroids and comets etc. • There are eight planets in the solar system. • Starting from the sun there are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. • […]
Continue ReadingAntibodies: Protein synthesized in the blood in response to the entry of foreign substances or organisms into the body. When the body get infected through virus or bacteria, specific antibody is produced which fights the disease. Antibiotics:These are substances which can stop the growth or destroy the bacteria or other microorganisms. The antibiotics are used […]
Continue ReadingUltrasonics:The study of sound aves with high frequencies beyond the upper limit of human hearing or 20 thousand Hz. This technique is employed to locate a tumour, to scan a pregnant woman’s abdomen in order to produce a picture of foetus or to treat certain neurotically disorders. Infrasonic: These are the sound waves which have […]
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