GK|सामान्य ज्ञान|Brilliant Academy|9891726652
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 - ...