Science Facts Set-9

• Aorta is the largest artery in the human body.
• Human windpipe (trachea) is about 12 cm long.
• There are two types of respiration based on the availability of oxygen. They are aerobic respiration and anaerobic respiration.
• Electronegativity is the relative tendency of an atom in a molecule to attract the shared pair of electrons towards itself.
• Neurons (nerve cells) are the longest cells. Some neurons are a few meters long!

• Sulphuric acid is also known as the king of chemicals.
• The word 'Agriculture' is derived from the Latin word 'Ager Cultura' which means 'Field Cultivation'.
• William Harvey was the first to discover the circulation of blood.
• Aluminium is a silvery white metal which has a melting point of 660 degrees centigrade.
• The lightest known metal is lithium whose atomic number is 3.