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1. The speed of sound in air is 330 metre per second. The unit of intensity of sound is Decibel.
2. X Rays was invented by Roentgen in 1895. X Rays are Electro Magnetic waves.
3. Cell was invented by Robert Hook. Study of cells is called Cytology. Group of cells is called Tissue. Study of Tissue is called Histology. Cell is structural and functional unit of life . Ovum (Female Gamete) is the largest cell in human body . The largest known animal cell is an Ostrich egg.
4. In Human Being the respiratory pigment is Hemoglobin. Hemoglobin is a protein in Red Blood Cells that carries oxygen. It is red due to sub units hemes which contains iron .
5. Amphibians and many reptiles have 3 chambered hearts : 2 Atria and 1 Ventricle. Human beings have 4 chambers in Heart.
6. The 4 fat soluble vitamins A ,D ,E ,K are stored in liver ,fatty tissue and muscles. The synthesis of Vitamin K takes place in liver.
7. Vitamins - Chemical Name 
Vitamin A - Retinol
Vitamin B1 - Thymin 
Vitamin B2 - Riboflavin
Vitamin B6 - Pyridoxine
Vitamin B12 - Cynocobalmin
Vitamin C - Ascorbic Acid 
Vitamin D - Calciferol
Vitamin E - Tochoferol
Vitamin K - Philoquinone
8. Vitamins & Minerals- Deficiency Diseases
Vitamin A - Night Blindness
Vitamin B1 - Beri Beri 
Vitamin B2 - Retarded growth,Bad Skin 
Vitamin B12- Anaemia
Vitamin C - Scurvy , Bleeding of Gums 
Vitamin D - Rickets
Vitamin E - Skin Disease, Impotency
Vitamin K - No Blood Clotting
Minerals - Deficiency Diseases
Calcium - Brittle Bones 
Phosphorous - Bad Teeth and bones 
Iron - Anaemia
Iodine - Goitre 
Copper - Low appetite, Retarded Growth 
### Due to Protein Deficiency - Kwashirkor and Marasmus
9. The chemical name of Baking Soda is Sodium Bicarbonate. The chemical name of common salt is Sodium Chloride. The Chemical Name of Washing Powder is Sodium Carbonate.
10. Microphone was invented by David Huges. Barometer was invented by Toricelli. Transformer was invented by Michael Faraday.

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